API Overview API Index Package Overview Direct link to this page
JDK 1.6
  javax.swing. JTree View Javadoc
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
612
613
614
615
616
617
618
619
620
621
622
623
624
625
626
627
628
629
630
631
632
633
634
635
636
637
638
639
640
641
642
643
644
645
646
647
648
649
650
651
652
653
654
655
656
657
658
659
660
661
662
663
664
665
666
667
668
669
670
671
672
673
674
675
676
677
678
679
680
681
682
683
684
685
686
687
688
689
690
691
692
693
694
695
696
697
698
699
700
701
702
703
704
705
706
707
708
709
710
711
712
713
714
715
716
717
718
719
720
721
722
723
724
725
726
727
728
729
730
731
732
733
734
735
736
737
738
739
740
741
742
743
744
745
746
747
748
749
750
751
752
753
754
755
756
757
758
759
760
761
762
763
764
765
766
767
768
769
770
771
772
773
774
775
776
777
778
779
780
781
782
783
784
785
786
787
788
789
790
791
792
793
794
795
796
797
798
799
800
801
802
803
804
805
806
807
808
809
810
811
812
813
814
815
816
817
818
819
820
821
822
823
824
825
826
827
828
829
830
831
832
833
834
835
836
837
838
839
840
841
842
843
844
845
846
847
848
849
850
851
852
853
854
855
856
857
858
859
860
861
862
863
864
865
866
867
868
869
870
871
872
873
874
875
876
877
878
879
880
881
882
883
884
885
886
887
888
889
890
891
892
893
894
895
896
897
898
899
900
901
902
903
904
905
906
907
908
909
910
911
912
913
914
915
916
917
918
919
920
921
922
923
924
925
926
927
928
929
930
931
932
933
934
935
936
937
938
939
940
941
942
943
944
945
946
947
948
949
950
951
952
953
954
955
956
957
958
959
960
961
962
963
964
965
966
967
968
969
970
971
972
973
974
975
976
977
978
979
980
981
982
983
984
985
986
987
988
989
990
991
992
993
994
995
996
997
998
999
1000
1001
1002
1003
1004
1005
1006
1007
1008
1009
1010
1011
1012
1013
1014
1015
1016
1017
1018
1019
1020
1021
1022
1023
1024
1025
1026
1027
1028
1029
1030
1031
1032
1033
1034
1035
1036
1037
1038
1039
1040
1041
1042
1043
1044
1045
1046
1047
1048
1049
1050
1051
1052
1053
1054
1055
1056
1057
1058
1059
1060
1061
1062
1063
1064
1065
1066
1067
1068
1069
1070
1071
1072
1073
1074
1075
1076
1077
1078
1079
1080
1081
1082
1083
1084
1085
1086
1087
1088
1089
1090
1091
1092
1093
1094
1095
1096
1097
1098
1099
1100
1101
1102
1103
1104
1105
1106
1107
1108
1109
1110
1111
1112
1113
1114
1115
1116
1117
1118
1119
1120
1121
1122
1123
1124
1125
1126
1127
1128
1129
1130
1131
1132
1133
1134
1135
1136
1137
1138
1139
1140
1141
1142
1143
1144
1145
1146
1147
1148
1149
1150
1151
1152
1153
1154
1155
1156
1157
1158
1159
1160
1161
1162
1163
1164
1165
1166
1167
1168
1169
1170
1171
1172
1173
1174
1175
1176
1177
1178
1179
1180
1181
1182
1183
1184
1185
1186
1187
1188
1189
1190
1191
1192
1193
1194
1195
1196
1197
1198
1199
1200
1201
1202
1203
1204
1205
1206
1207
1208
1209
1210
1211
1212
1213
1214
1215
1216
1217
1218
1219
1220
1221
1222
1223
1224
1225
1226
1227
1228
1229
1230
1231
1232
1233
1234
1235
1236
1237
1238
1239
1240
1241
1242
1243
1244
1245
1246
1247
1248
1249
1250
1251
1252
1253
1254
1255
1256
1257
1258
1259
1260
1261
1262
1263
1264
1265
1266
1267
1268
1269
1270
1271
1272
1273
1274
1275
1276
1277
1278
1279
1280
1281
1282
1283
1284
1285
1286
1287
1288
1289
1290
1291
1292
1293
1294
1295
1296
1297
1298
1299
1300
1301
1302
1303
1304
1305
1306
1307
1308
1309
1310
1311
1312
1313
1314
1315
1316
1317
1318
1319
1320
1321
1322
1323
1324
1325
1326
1327
1328
1329
1330
1331
1332
1333
1334
1335
1336
1337
1338
1339
1340
1341
1342
1343
1344
1345
1346
1347
1348
1349
1350
1351
1352
1353
1354
1355
1356
1357
1358
1359
1360
1361
1362
1363
1364
1365
1366
1367
1368
1369
1370
1371
1372
1373
1374
1375
1376
1377
1378
1379
1380
1381
1382
1383
1384
1385
1386
1387
1388
1389
1390
1391
1392
1393
1394
1395
1396
1397
1398
1399
1400
1401
1402
1403
1404
1405
1406
1407
1408
1409
1410
1411
1412
1413
1414
1415
1416
1417
1418
1419
1420
1421
1422
1423
1424
1425
1426
1427
1428
1429
1430
1431
1432
1433
1434
1435
1436
1437
1438
1439
1440
1441
1442
1443
1444
1445
1446
1447
1448
1449
1450
1451
1452
1453
1454
1455
1456
1457
1458
1459
1460
1461
1462
1463
1464
1465
1466
1467
1468
1469
1470
1471
1472
1473
1474
1475
1476
1477
1478
1479
1480
1481
1482
1483
1484
1485
1486
1487
1488
1489
1490
1491
1492
1493
1494
1495
1496
1497
1498
1499
1500
1501
1502
1503
1504
1505
1506
1507
1508
1509
1510
1511
1512
1513
1514
1515
1516
1517
1518
1519
1520
1521
1522
1523
1524
1525
1526
1527
1528
1529
1530
1531
1532
1533
1534
1535
1536
1537
1538
1539
1540
1541
1542
1543
1544
1545
1546
1547
1548
1549
1550
1551
1552
1553
1554
1555
1556
1557
1558
1559
1560
1561
1562
1563
1564
1565
1566
1567
1568
1569
1570
1571
1572
1573
1574
1575
1576
1577
1578
1579
1580
1581
1582
1583
1584
1585
1586
1587
1588
1589
1590
1591
1592
1593
1594
1595
1596
1597
1598
1599
1600
1601
1602
1603
1604
1605
1606
1607
1608
1609
1610
1611
1612
1613
1614
1615
1616
1617
1618
1619
1620
1621
1622
1623
1624
1625
1626
1627
1628
1629
1630
1631
1632
1633
1634
1635
1636
1637
1638
1639
1640
1641
1642
1643
1644
1645
1646
1647
1648
1649
1650
1651
1652
1653
1654
1655
1656
1657
1658
1659
1660
1661
1662
1663
1664
1665
1666
1667
1668
1669
1670
1671
1672
1673
1674
1675
1676
1677
1678
1679
1680
1681
1682
1683
1684
1685
1686
1687
1688
1689
1690
1691
1692
1693
1694
1695
1696
1697
1698
1699
1700
1701
1702
1703
1704
1705
1706
1707
1708
1709
1710
1711
1712
1713
1714
1715
1716
1717
1718
1719
1720
1721
1722
1723
1724
1725
1726
1727
1728
1729
1730
1731
1732
1733
1734
1735
1736
1737
1738
1739
1740
1741
1742
1743
1744
1745
1746
1747
1748
1749
1750
1751
1752
1753
1754
1755
1756
1757
1758
1759
1760
1761
1762
1763
1764
1765
1766
1767
1768
1769
1770
1771
1772
1773
1774
1775
1776
1777
1778
1779
1780
1781
1782
1783
1784
1785
1786
1787
1788
1789
1790
1791
1792
1793
1794
1795
1796
1797
1798
1799
1800
1801
1802
1803
1804
1805
1806
1807
1808
1809
1810
1811
1812
1813
1814
1815
1816
1817
1818
1819
1820
1821
1822
1823
1824
1825
1826
1827
1828
1829
1830
1831
1832
1833
1834
1835
1836
1837
1838
1839
1840
1841
1842
1843
1844
1845
1846
1847
1848
1849
1850
1851
1852
1853
1854
1855
1856
1857
1858
1859
1860
1861
1862
1863
1864
1865
1866
1867
1868
1869
1870
1871
1872
1873
1874
1875
1876
1877
1878
1879
1880
1881
1882
1883
1884
1885
1886
1887
1888
1889
1890
1891
1892
1893
1894
1895
1896
1897
1898
1899
1900
1901
1902
1903
1904
1905
1906
1907
1908
1909
1910
1911
1912
1913
1914
1915
1916
1917
1918
1919
1920
1921
1922
1923
1924
1925
1926
1927
1928
1929
1930
1931
1932
1933
1934
1935
1936
1937
1938
1939
1940
1941
1942
1943
1944
1945
1946
1947
1948
1949
1950
1951
1952
1953
1954
1955
1956
1957
1958
1959
1960
1961
1962
1963
1964
1965
1966
1967
1968
1969
1970
1971
1972
1973
1974
1975
1976
1977
1978
1979
1980
1981
1982
1983
1984
1985
1986
1987
1988
1989
1990
1991
1992
1993
1994
1995
1996
1997
1998
1999
2000
2001
2002
2003
2004
2005
2006
2007
2008
2009
2010
2011
2012
2013
2014
2015
2016
2017
2018
2019
2020
2021
2022
2023
2024
2025
2026
2027
2028
2029
2030
2031
2032
2033
2034
2035
2036
2037
2038
2039
2040
2041
2042
2043
2044
2045
2046
2047
2048
2049
2050
2051
2052
2053
2054
2055
2056
2057
2058
2059
2060
2061
2062
2063
2064
2065
2066
2067
2068
2069
2070
2071
2072
2073
2074
2075
2076
2077
2078
2079
2080
2081
2082
2083
2084
2085
2086
2087
2088
2089
2090
2091
2092
2093
2094
2095
2096
2097
2098
2099
2100
2101
2102
2103
2104
2105
2106
2107
2108
2109
2110
2111
2112
2113
2114
2115
2116
2117
2118
2119
2120
2121
2122
2123
2124
2125
2126
2127
2128
2129
2130
2131
2132
2133
2134
2135
2136
2137
2138
2139
2140
2141
2142
2143
2144
2145
2146
2147
2148
2149
2150
2151
2152
2153
2154
2155
2156
2157
2158
2159
2160
2161
2162
2163
2164
2165
2166
2167
2168
2169
2170
2171
2172
2173
2174
2175
2176
2177
2178
2179
2180
2181
2182
2183
2184
2185
2186
2187
2188
2189
2190
2191
2192
2193
2194
2195
2196
2197
2198
2199
2200
2201
2202
2203
2204
2205
2206
2207
2208
2209
2210
2211
2212
2213
2214
2215
2216
2217
2218
2219
2220
2221
2222
2223
2224
2225
2226
2227
2228
2229
2230
2231
2232
2233
2234
2235
2236
2237
2238
2239
2240
2241
2242
2243
2244
2245
2246
2247
2248
2249
2250
2251
2252
2253
2254
2255
2256
2257
2258
2259
2260
2261
2262
2263
2264
2265
2266
2267
2268
2269
2270
2271
2272
2273
2274
2275
2276
2277
2278
2279
2280
2281
2282
2283
2284
2285
2286
2287
2288
2289
2290
2291
2292
2293
2294
2295
2296
2297
2298
2299
2300
2301
2302
2303
2304
2305
2306
2307
2308
2309
2310
2311
2312
2313
2314
2315
2316
2317
2318
2319
2320
2321
2322
2323
2324
2325
2326
2327
2328
2329
2330
2331
2332
2333
2334
2335
2336
2337
2338
2339
2340
2341
2342
2343
2344
2345
2346
2347
2348
2349
2350
2351
2352
2353
2354
2355
2356
2357
2358
2359
2360
2361
2362
2363
2364
2365
2366
2367
2368
2369
2370
2371
2372
2373
2374
2375
2376
2377
2378
2379
2380
2381
2382
2383
2384
2385
2386
2387
2388
2389
2390
2391
2392
2393
2394
2395
2396
2397
2398
2399
2400
2401
2402
2403
2404
2405
2406
2407
2408
2409
2410
2411
2412
2413
2414
2415
2416
2417
2418
2419
2420
2421
2422
2423
2424
2425
2426
2427
2428
2429
2430
2431
2432
2433
2434
2435
2436
2437
2438
2439
2440
2441
2442
2443
2444
2445
2446
2447
2448
2449
2450
2451
2452
2453
2454
2455
2456
2457
2458
2459
2460
2461
2462
2463
2464
2465
2466
2467
2468
2469
2470
2471
2472
2473
2474
2475
2476
2477
2478
2479
2480
2481
2482
2483
2484
2485
2486
2487
2488
2489
2490
2491
2492
2493
2494
2495
2496
2497
2498
2499
2500
2501
2502
2503
2504
2505
2506
2507
2508
2509
2510
2511
2512
2513
2514
2515
2516
2517
2518
2519
2520
2521
2522
2523
2524
2525
2526
2527
2528
2529
2530
2531
2532
2533
2534
2535
2536
2537
2538
2539
2540
2541
2542
2543
2544
2545
2546
2547
2548
2549
2550
2551
2552
2553
2554
2555
2556
2557
2558
2559
2560
2561
2562
2563
2564
2565
2566
2567
2568
2569
2570
2571
2572
2573
2574
2575
2576
2577
2578
2579
2580
2581
2582
2583
2584
2585
2586
2587
2588
2589
2590
2591
2592
2593
2594
2595
2596
2597
2598
2599
2600
2601
2602
2603
2604
2605
2606
2607
2608
2609
2610
2611
2612
2613
2614
2615
2616
2617
2618
2619
2620
2621
2622
2623
2624
2625
2626
2627
2628
2629
2630
2631
2632
2633
2634
2635
2636
2637
2638
2639
2640
2641
2642
2643
2644
2645
2646
2647
2648
2649
2650
2651
2652
2653
2654
2655
2656
2657
2658
2659
2660
2661
2662
2663
2664
2665
2666
2667
2668
2669
2670
2671
2672
2673
2674
2675
2676
2677
2678
2679
2680
2681
2682
2683
2684
2685
2686
2687
2688
2689
2690
2691
2692
2693
2694
2695
2696
2697
2698
2699
2700
2701
2702
2703
2704
2705
2706
2707
2708
2709
2710
2711
2712
2713
2714
2715
2716
2717
2718
2719
2720
2721
2722
2723
2724
2725
2726
2727
2728
2729
2730
2731
2732
2733
2734
2735
2736
2737
2738
2739
2740
2741
2742
2743
2744
2745
2746
2747
2748
2749
2750
2751
2752
2753
2754
2755
2756
2757
2758
2759
2760
2761
2762
2763
2764
2765
2766
2767
2768
2769
2770
2771
2772
2773
2774
2775
2776
2777
2778
2779
2780
2781
2782
2783
2784
2785
2786
2787
2788
2789
2790
2791
2792
2793
2794
2795
2796
2797
2798
2799
2800
2801
2802
2803
2804
2805
2806
2807
2808
2809
2810
2811
2812
2813
2814
2815
2816
2817
2818
2819
2820
2821
2822
2823
2824
2825
2826
2827
2828
2829
2830
2831
2832
2833
2834
2835
2836
2837
2838
2839
2840
2841
2842
2843
2844
2845
2846
2847
2848
2849
2850
2851
2852
2853
2854
2855
2856
2857
2858
2859
2860
2861
2862
2863
2864
2865
2866
2867
2868
2869
2870
2871
2872
2873
2874
2875
2876
2877
2878
2879
2880
2881
2882
2883
2884
2885
2886
2887
2888
2889
2890
2891
2892
2893
2894
2895
2896
2897
2898
2899
2900
2901
2902
2903
2904
2905
2906
2907
2908
2909
2910
2911
2912
2913
2914
2915
2916
2917
2918
2919
2920
2921
2922
2923
2924
2925
2926
2927
2928
2929
2930
2931
2932
2933
2934
2935
2936
2937
2938
2939
2940
2941
2942
2943
2944
2945
2946
2947
2948
2949
2950
2951
2952
2953
2954
2955
2956
2957
2958
2959
2960
2961
2962
2963
2964
2965
2966
2967
2968
2969
2970
2971
2972
2973
2974
2975
2976
2977
2978
2979
2980
2981
2982
2983
2984
2985
2986
2987
2988
2989
2990
2991
2992
2993
2994
2995
2996
2997
2998
2999
3000
3001
3002
3003
3004
3005
3006
3007
3008
3009
3010
3011
3012
3013
3014
3015
3016
3017
3018
3019
3020
3021
3022
3023
3024
3025
3026
3027
3028
3029
3030
3031
3032
3033
3034
3035
3036
3037
3038
3039
3040
3041
3042
3043
3044
3045
3046
3047
3048
3049
3050
3051
3052
3053
3054
3055
3056
3057
3058
3059
3060
3061
3062
3063
3064
3065
3066
3067
3068
3069
3070
3071
3072
3073
3074
3075
3076
3077
3078
3079
3080
3081
3082
3083
3084
3085
3086
3087
3088
3089
3090
3091
3092
3093
3094
3095
3096
3097
3098
3099
3100
3101
3102
3103
3104
3105
3106
3107
3108
3109
3110
3111
3112
3113
3114
3115
3116
3117
3118
3119
3120
3121
3122
3123
3124
3125
3126
3127
3128
3129
3130
3131
3132
3133
3134
3135
3136
3137
3138
3139
3140
3141
3142
3143
3144
3145
3146
3147
3148
3149
3150
3151
3152
3153
3154
3155
3156
3157
3158
3159
3160
3161
3162
3163
3164
3165
3166
3167
3168
3169
3170
3171
3172
3173
3174
3175
3176
3177
3178
3179
3180
3181
3182
3183
3184
3185
3186
3187
3188
3189
3190
3191
3192
3193
3194
3195
3196
3197
3198
3199
3200
3201
3202
3203
3204
3205
3206
3207
3208
3209
3210
3211
3212
3213
3214
3215
3216
3217
3218
3219
3220
3221
3222
3223
3224
3225
3226
3227
3228
3229
3230
3231
3232
3233
3234
3235
3236
3237
3238
3239
3240
3241
3242
3243
3244
3245
3246
3247
3248
3249
3250
3251
3252
3253
3254
3255
3256
3257
3258
3259
3260
3261
3262
3263
3264
3265
3266
3267
3268
3269
3270
3271
3272
3273
3274
3275
3276
3277
3278
3279
3280
3281
3282
3283
3284
3285
3286
3287
3288
3289
3290
3291
3292
3293
3294
3295
3296
3297
3298
3299
3300
3301
3302
3303
3304
3305
3306
3307
3308
3309
3310
3311
3312
3313
3314
3315
3316
3317
3318
3319
3320
3321
3322
3323
3324
3325
3326
3327
3328
3329
3330
3331
3332
3333
3334
3335
3336
3337
3338
3339
3340
3341
3342
3343
3344
3345
3346
3347
3348
3349
3350
3351
3352
3353
3354
3355
3356
3357
3358
3359
3360
3361
3362
3363
3364
3365
3366
3367
3368
3369
3370
3371
3372
3373
3374
3375
3376
3377
3378
3379
3380
3381
3382
3383
3384
3385
3386
3387
3388
3389
3390
3391
3392
3393
3394
3395
3396
3397
3398
3399
3400
3401
3402
3403
3404
3405
3406
3407
3408
3409
3410
3411
3412
3413
3414
3415
3416
3417
3418
3419
3420
3421
3422
3423
3424
3425
3426
3427
3428
3429
3430
3431
3432
3433
3434
3435
3436
3437
3438
3439
3440
3441
3442
3443
3444
3445
3446
3447
3448
3449
3450
3451
3452
3453
3454
3455
3456
3457
3458
3459
3460
3461
3462
3463
3464
3465
3466
3467
3468
3469
3470
3471
3472
3473
3474
3475
3476
3477
3478
3479
3480
3481
3482
3483
3484
3485
3486
3487
3488
3489
3490
3491
3492
3493
3494
3495
3496
3497
3498
3499
3500
3501
3502
3503
3504
3505
3506
3507
3508
3509
3510
3511
3512
3513
3514
3515
3516
3517
3518
3519
3520
3521
3522
3523
3524
3525
3526
3527
3528
3529
3530
3531
3532
3533
3534
3535
3536
3537
3538
3539
3540
3541
3542
3543
3544
3545
3546
3547
3548
3549
3550
3551
3552
3553
3554
3555
3556
3557
3558
3559
3560
3561
3562
3563
3564
3565
3566
3567
3568
3569
3570
3571
3572
3573
3574
3575
3576
3577
3578
3579
3580
3581
3582
3583
3584
3585
3586
3587
3588
3589
3590
3591
3592
3593
3594
3595
3596
3597
3598
3599
3600
3601
3602
3603
3604
3605
3606
3607
3608
3609
3610
3611
3612
3613
3614
3615
3616
3617
3618
3619
3620
3621
3622
3623
3624
3625
3626
3627
3628
3629
3630
3631
3632
3633
3634
3635
3636
3637
3638
3639
3640
3641
3642
3643
3644
3645
3646
3647
3648
3649
3650
3651
3652
3653
3654
3655
3656
3657
3658
3659
3660
3661
3662
3663
3664
3665
3666
3667
3668
3669
3670
3671
3672
3673
3674
3675
3676
3677
3678
3679
3680
3681
3682
3683
3684
3685
3686
3687
3688
3689
3690
3691
3692
3693
3694
3695
3696
3697
3698
3699
3700
3701
3702
3703
3704
3705
3706
3707
3708
3709
3710
3711
3712
3713
3714
3715
3716
3717
3718
3719
3720
3721
3722
3723
3724
3725
3726
3727
3728
3729
3730
3731
3732
3733
3734
3735
3736
3737
3738
3739
3740
3741
3742
3743
3744
3745
3746
3747
3748
3749
3750
3751
3752
3753
3754
3755
3756
3757
3758
3759
3760
3761
3762
3763
3764
3765
3766
3767
3768
3769
3770
3771
3772
3773
3774
3775
3776
3777
3778
3779
3780
3781
3782
3783
3784
3785
3786
3787
3788
3789
3790
3791
3792
3793
3794
3795
3796
3797
3798
3799
3800
3801
3802
3803
3804
3805
3806
3807
3808
3809
3810
3811
3812
3813
3814
3815
3816
3817
3818
3819
3820
3821
3822
3823
3824
3825
3826
3827
3828
3829
3830
3831
3832
3833
3834
3835
3836
3837
3838
3839
3840
3841
3842
3843
3844
3845
3846
3847
3848
3849
3850
3851
3852
3853
3854
3855
3856
3857
3858
3859
3860
3861
3862
3863
3864
3865
3866
3867
3868
3869
3870
3871
3872
3873
3874
3875
3876
3877
3878
3879
3880
3881
3882
3883
3884
3885
3886
3887
3888
3889
3890
3891
3892
3893
3894
3895
3896
3897
3898
3899
3900
3901
3902
3903
3904
3905
3906
3907
3908
3909
3910
3911
3912
3913
3914
3915
3916
3917
3918
3919
3920
3921
3922
3923
3924
3925
3926
3927
3928
3929
3930
3931
3932
3933
3934
3935
3936
3937
3938
3939
3940
3941
3942
3943
3944
3945
3946
3947
3948
3949
3950
3951
3952
3953
3954
3955
3956
3957
3958
3959
3960
3961
3962
3963
3964
3965
3966
3967
3968
3969
3970
3971
3972
3973
3974
3975
3976
3977
3978
3979
3980
3981
3982
3983
3984
3985
3986
3987
3988
3989
3990
3991
3992
3993
3994
3995
3996
3997
3998
3999
4000
4001
4002
4003
4004
4005
4006
4007
4008
4009
4010
4011
4012
4013
4014
4015
4016
4017
4018
4019
4020
4021
4022
4023
4024
4025
4026
4027
4028
4029
4030
4031
4032
4033
4034
4035
4036
4037
4038
4039
4040
4041
4042
4043
4044
4045
4046
4047
4048
4049
4050
4051
4052
4053
4054
4055
4056
4057
4058
4059
4060
4061
4062
4063
4064
4065
4066
4067
4068
4069
4070
4071
4072
4073
4074
4075
4076
4077
4078
4079
4080
4081
4082
4083
4084
4085
4086
4087
4088
4089
4090
4091
4092
4093
4094
4095
4096
4097
4098
4099
4100
4101
4102
4103
4104
4105
4106
4107
4108
4109
4110
4111
4112
4113
4114
4115
4116
4117
4118
4119
4120
4121
4122
4123
4124
4125
4126
4127
4128
4129
4130
4131
4132
4133
4134
4135
4136
4137
4138
4139
4140
4141
4142
4143
4144
4145
4146
4147
4148
4149
4150
4151
4152
4153
4154
4155
4156
4157
4158
4159
4160
4161
4162
4163
4164
4165
4166
4167
4168
4169
4170
4171
4172
4173
4174
4175
4176
4177
4178
4179
4180
4181
4182
4183
4184
4185
4186
4187
4188
4189
4190
4191
4192
4193
4194
4195
4196
4197
4198
4199
4200
4201
4202
4203
4204
4205
4206
4207
4208
4209
4210
4211
4212
4213
4214
4215
4216
4217
4218
4219
4220
4221
4222
4223
4224
4225
4226
4227
4228
4229
4230
4231
4232
4233
4234
4235
4236
4237
4238
4239
4240
4241
4242
4243
4244
4245
4246
4247
4248
4249
4250
4251
4252
4253
4254
4255
4256
4257
4258
4259
4260
4261
4262
4263
4264
4265
4266
4267
4268
4269
4270
4271
4272
4273
4274
4275
4276
4277
4278
4279
4280
4281
4282
4283
4284
4285
4286
4287
4288
4289
4290
4291
4292
4293
4294
4295
4296
4297
4298
4299
4300
4301
4302
4303
4304
4305
4306
4307
4308
4309
4310
4311
4312
4313
4314
4315
4316
4317
4318
4319
4320
4321
4322
4323
4324
4325
4326
4327
4328
4329
4330
4331
4332
4333
4334
4335
4336
4337
4338
4339
4340
4341
4342
4343
4344
4345
4346
4347
4348
4349
4350
4351
4352
4353
4354
4355
4356
4357
4358
4359
4360
4361
4362
4363
4364
4365
4366
4367
4368
4369
4370
4371
4372
4373
4374
4375
4376
4377
4378
4379
4380
4381
4382
4383
4384
4385
4386
4387
4388
4389
4390
4391
4392
4393
4394
4395
4396
4397
4398
4399
4400
4401
4402
4403
4404
4405
4406
4407
4408
4409
4410
4411
4412
4413
4414
4415
4416
4417
4418
4419
4420
4421
4422
4423
4424
4425
4426
4427
4428
4429
4430
4431
4432
4433
4434
4435
4436
4437
4438
4439
4440
4441
4442
4443
4444
4445
4446
4447
4448
4449
4450
4451
4452
4453
4454
4455
4456
4457
4458
4459
4460
4461
4462
4463
4464
4465
4466
4467
4468
4469
4470
4471
4472
4473
4474
4475
4476
4477
4478
4479
4480
4481
4482
4483
4484
4485
4486
4487
4488
4489
4490
4491
4492
4493
4494
4495
4496
4497
4498
4499
4500
4501
4502
4503
4504
4505
4506
4507
4508
4509
4510
4511
4512
4513
4514
4515
4516
4517
4518
4519
4520
4521
4522
4523
4524
4525
4526
4527
4528
4529
4530
4531
4532
4533
4534
4535
4536
4537
4538
4539
4540
4541
4542
4543
4544
4545
4546
4547
4548
4549
4550
4551
4552
4553
4554
4555
4556
4557
4558
4559
4560
4561
4562
4563
4564
4565
4566
4567
4568
4569
4570
4571
4572
4573
4574
4575
4576
4577
4578
4579
4580
4581
4582
4583
4584
4585
4586
4587
4588
4589
4590
4591
4592
4593
4594
4595
4596
4597
4598
4599
4600
4601
4602
4603
4604
4605
4606
4607
4608
4609
4610
4611
4612
4613
4614
4615
4616
4617
4618
4619
4620
4621
4622
4623
4624
4625
4626
4627
4628
4629
4630
4631
4632
4633
4634
4635
4636
4637
4638
4639
4640
4641
4642
4643
4644
4645
4646
4647
4648
4649
4650
4651
4652
4653
4654
4655
4656
4657
4658
4659
4660
4661
4662
4663
4664
4665
4666
4667
4668
4669
4670
4671
4672
4673
4674
4675
4676
4677
4678
4679
4680
4681
4682
4683
4684
4685
4686
4687
4688
4689
4690
4691
4692
4693
4694
4695
4696
4697
4698
4699
4700
4701
4702
4703
4704
4705
4706
4707
4708
4709
4710
4711
4712
4713
4714
4715
4716
4717
4718
4719
4720
4721
4722
4723
4724
4725
4726
4727
4728
4729
4730
4731
4732
4733
4734
4735
4736
4737
4738
4739
4740
4741
4742
4743
4744
4745
4746
4747
4748
4749
4750
4751
4752
4753
4754
4755
4756
4757
4758
4759
4760
4761
4762
4763
4764
4765
4766
4767
4768
4769
4770
4771
4772
4773
4774
4775
4776
4777
4778
4779
4780
4781
4782
4783
4784
4785
4786
4787
4788
4789
4790
4791
4792
4793
4794
4795
4796
4797
4798
4799
4800
4801
4802
4803
4804
4805
4806
4807
4808
4809
4810
4811
4812
4813
4814
4815
4816
4817
4818
4819
4820
4821
4822
4823
4824
4825
4826
4827
4828
4829
4830
4831
4832
4833
4834
4835
4836
4837
4838
4839
4840
4841
4842
4843
4844
4845
4846
4847
4848
4849
4850
4851
4852
4853
4854
4855
4856
4857
4858
4859
4860
4861
4862
4863
4864
4865
4866
4867
4868
4869
4870
4871
4872
4873
4874
4875
4876
4877
4878
4879
4880
4881
4882
4883
4884
4885
4886
4887
4888
4889
4890
4891
4892
4893
4894
4895
4896
4897
4898
4899
4900
4901
4902
4903
4904
4905
4906
4907
4908
4909
4910
4911
4912
4913
4914
4915
4916
4917
4918
4919
4920
4921
4922
4923
4924
4925
4926
4927
4928
4929
4930
4931
4932
4933
4934
4935
4936
4937
4938
4939
4940
4941
4942
4943
4944
4945
4946
4947
4948
4949
4950
4951
4952
4953
4954
4955
4956
4957
4958
4959
4960
4961
4962
4963
4964
4965
4966
4967
4968
4969
4970
4971
4972
4973
4974
4975
4976
4977
4978
4979
4980
4981
4982
4983
4984
4985
4986
4987
4988
4989
4990
4991
4992
4993
4994
4995
4996
4997
4998
4999
5000
5001
5002
5003
5004
5005
5006
5007
5008
5009
5010
5011
5012
5013
5014
5015
5016
5017
5018
5019
5020
5021
5022
5023
5024
5025
5026
5027
5028
5029
5030
5031
5032
5033
5034
5035
5036
5037
5038
5039
5040
5041
5042
5043
5044
5045
5046
5047
5048
5049
5050
5051
5052
5053
5054
5055
5056
5057
5058
5059
5060
5061
5062
5063
5064
5065
5066
5067
5068
5069
5070
5071
5072
5073
5074
5075
5076
5077
5078
5079
5080
5081
5082
5083
5084
5085
5086
5087
5088
5089
5090
5091
5092
5093
5094
5095
5096
5097
5098
5099
5100
5101
5102
5103
5104
5105
5106
5107
5108
5109
5110
5111
5112
5113
5114
5115
5116
5117
5118
5119
5120
5121
5122
5123
5124
5125
5126
5127
5128
5129
5130
5131
5132
5133
5134
5135
5136
5137
5138
5139
5140
5141
5142
5143
5144
5145
5146
5147
5148
5149
5150
5151
5152
5153
5154
5155
5156
5157
5158
5159
5160
5161
5162
5163
5164
5165
5166
5167
5168
5169
5170
5171
5172
5173
5174
5175
5176
5177
5178
5179
5180
5181
5182
5183
5184
5185
5186
5187
5188
5189
5190
5191
5192
5193
5194
5195
5196
5197
5198
5199
5200
5201
5202
5203
5204
5205
5206
5207
5208
5209
5210
5211
5212
5213
5214
5215
5216
5217
5218
5219
5220
5221
5222
5223
5224
5225
5226
5227
5228
5229
5230
5231
5232
5233
5234
5235
5236
5237
5238
5239
5240
5241
5242
5243
5244
5245
5246
5247
5248
5249
5250
5251
5252
5253
5254
5255
5256
5257
5258
5259
5260
5261
5262
5263
5264
5265
5266
5267
5268
5269
5270
5271
5272
5273
5274
5275
5276
5277
5278
5279
5280
5281
5282
5283
5284
5285
5286
5287
5288
5289
5290
5291
5292
5293
5294
5295
5296
5297
5298
5299
5300
5301
5302
5303
5304
5305
5306
5307
5308
5309
5310
5311
5312
5313
5314
5315
5316
5317
5318

/*
 * @(#)JTree.java	1.196 07/01/17
 *
 * Copyright 2006 Sun Microsystems, Inc. All rights reserved.
 * SUN PROPRIETARY/CONFIDENTIAL. Use is subject to license terms.
 */

package javax.swing;

import java.awt.*;
import java.awt.event.*;
import java.beans.*;
import java.io.*;
import java.util.*;
import javax.swing.event.*;
import javax.swing.plaf.*;
import javax.swing.tree.*;
import javax.swing.text.Position;
import javax.accessibility.*;
import sun.swing.SwingUtilities2;
import sun.swing.SwingUtilities2.Section;
import static sun.swing.SwingUtilities2.Section.*;


/**
 * <a name="jtree_description">
 * A control that displays a set of hierarchical data as an outline.
 * You can find task-oriented documentation and examples of using trees in
 * <a href="http://java.sun.com/docs/books/tutorial/uiswing/components/tree.html">How to Use Trees</a>,
 * a section in <em>The Java Tutorial.</em>
 * <p>
 * A specific node in a tree can be identified either by a
 * <code>TreePath</code> (an object
 * that encapsulates a node and all of its ancestors), or by its
 * display row, where each row in the display area displays one node.
 * An <i>expanded</i> node is a non-leaf node (as identified by
 * <code>TreeModel.isLeaf(node)</code> returning false) that will displays
 * its children when all its ancestors are <i>expanded</i>.
 * A <i>collapsed</i>
 * node is one which hides them. A <i>hidden</i> node is one which is
 * under a collapsed ancestor. All of a <i>viewable</i> nodes parents
 * are expanded, but may or may not be displayed. A <i>displayed</i> node
 * is both viewable and in the display area, where it can be seen.
 * <p>
 * The following <code>JTree</code> methods use "visible" to mean "displayed":
 * <ul>
 * <li><code>isRootVisible()</code>
 * <li><code>setRootVisible()</code>
 * <li><code>scrollPathToVisible()</code>
 * <li><code>scrollRowToVisible()</code>
 * <li><code>getVisibleRowCount()</code>
 * <li><code>setVisibleRowCount()</code>
 * </ul>
 * <p>
 * The next group of <code>JTree</code> methods use "visible" to mean
 * "viewable" (under an expanded parent):
 * <ul>
 * <li><code>isVisible()</code>
 * <li><code>makeVisible()</code>
 * </ul>
 * <p>
 * If you are interested in knowing when the selection changes implement
 * the <code>TreeSelectionListener</code> interface and add the instance
 * using the method <code>addTreeSelectionListener</code>.
 * <code>valueChanged</code> will be invoked when the
 * selection changes, that is if the user clicks twice on the same
 * node <code>valueChanged</code> will only be invoked once.
 * <p>
 * If you are interested in detecting either double-click events or when
 * a user clicks on a node, regardless of whether or not it was selected,
 * we recommend you do the following:
 * <pre>
 * final JTree tree = ...;
 *
 * MouseListener ml = new MouseAdapter() {
 *     public void <b>mousePressed</b>(MouseEvent e) {
 *         int selRow = tree.getRowForLocation(e.getX(), e.getY());
 *         TreePath selPath = tree.getPathForLocation(e.getX(), e.getY());
 *         if(selRow != -1) {
 *             if(e.getClickCount() == 1) {
 *                 mySingleClick(selRow, selPath);
 *             }
 *             else if(e.getClickCount() == 2) {
 *                 myDoubleClick(selRow, selPath);
 *             }
 *         }
 *     }
 * };
 * tree.addMouseListener(ml);
 * </pre>
 * NOTE: This example obtains both the path and row, but you only need to
 * get the one you're interested in.
 * <p>
 * To use <code>JTree</code> to display compound nodes
 * (for example, nodes containing both
 * a graphic icon and text), subclass {@link TreeCellRenderer} and use 
 * {@link #setCellRenderer} to tell the tree to use it. To edit such nodes,
 * subclass {@link TreeCellEditor} and use {@link #setCellEditor}.
 * <p>
 * Like all <code>JComponent</code> classes, you can use {@link InputMap} and
 * {@link ActionMap}
 * to associate an {@link Action} object with a {@link KeyStroke}
 * and execute the action under specified conditions.
 * <p>
 * <strong>Warning:</strong> Swing is not thread safe. For more
 * information see <a
 * href="package-summary.html#threading">Swing's Threading
 * Policy</a>.
 * <p>
 * <strong>Warning:</strong>
 * Serialized objects of this class will not be compatible with
 * future Swing releases. The current serialization support is
 * appropriate for short term storage or RMI between applications running
 * the same version of Swing.  As of 1.4, support for long term storage
 * of all JavaBeans<sup><font size="-2">TM</font></sup>
 * has been added to the <code>java.beans</code> package.
 * Please see {@link java.beans.XMLEncoder}.
 *
 * @beaninfo
 *   attribute: isContainer false
 * description: A component that displays a set of hierarchical data as an outline.
 *
 * @version 1.196, 01/17/07
 * @author Rob Davis
 * @author Ray Ryan
 * @author Scott Violet
 */
public class JTree extends JComponent implements Scrollable, Accessible
{
    /**
     * @see #getUIClassID
     * @see #readObject
     */
    private static final String uiClassID = "TreeUI";

    /**
     * The model that defines the tree displayed by this object.
     */
    transient protected TreeModel        treeModel;

    /**
     * Models the set of selected nodes in this tree.
     */
    transient protected TreeSelectionModel selectionModel;

    /**
     * True if the root node is displayed, false if its children are
     * the highest visible nodes.
     */
    protected boolean                    rootVisible;

    /**
     * The cell used to draw nodes. If <code>null</code>, the UI uses a default
     * <code>cellRenderer</code>.
     */
    transient protected TreeCellRenderer  cellRenderer;

    /**
     * Height to use for each display row. If this is <= 0 the renderer 
     * determines the height for each row.
     */
    protected int                         rowHeight;
    private boolean                       rowHeightSet = false;

    /**
     * Maps from <code>TreePath</code> to <code>Boolean</code>
     * indicating whether or not the
     * particular path is expanded. This ONLY indicates whether a 
     * given path is expanded, and NOT if it is visible or not. That
     * information must be determined by visiting all the parent
     * paths and seeing if they are visible.
     */
    transient private Hashtable           expandedState;


    /**
     * True if handles are displayed at the topmost level of the tree.
     * <p>
     * A handle is a small icon that displays adjacent to the node which 
     * allows the user to click once to expand or collapse the node. A
     * common interface shows a plus sign (+) for a node which can be
     * expanded and a minus sign (-) for a node which can be collapsed.
     * Handles are always shown for nodes below the topmost level.
     * <p>
     * If the <code>rootVisible</code> setting specifies that the root 
     * node is to be displayed, then that is the only node at the topmost
     * level. If the root node is not displayed, then all of its 
     * children are at the topmost level of the tree. Handles are 
     * always displayed for nodes other than the topmost.
     * <p> 
     * If the root node isn't visible, it is generally a good to make 
     * this value true. Otherwise, the tree looks exactly like a list,
     * and users may not know that the "list entries" are actually
     * tree nodes.
     *
     * @see #rootVisible
     */
    protected boolean           showsRootHandles;
    private boolean             showsRootHandlesSet = false;

    /**
     * Creates a new event and passed it off the
     * <code>selectionListeners</code>.
     */
    protected transient TreeSelectionRedirector selectionRedirector;

    /**
     * Editor for the entries.  Default is <code>null</code>
     * (tree is not editable).
     */
    transient protected TreeCellEditor          cellEditor;

    /**
     * Is the tree editable? Default is false.
     */
    protected boolean                 editable;

    /**
     * Is this tree a large model? This is a code-optimization setting.
     * A large model can be used when the cell height is the same for all
     * nodes. The UI will then cache very little information and instead
     * continually message the model. Without a large model the UI caches 
     * most of the information, resulting in fewer method calls to the model.
     * <p>
     * This value is only a suggestion to the UI. Not all UIs will
     * take advantage of it. Default value is false.
     */
    protected boolean                 largeModel;

    /**
     * Number of rows to make visible at one time. This value is used for
     * the <code>Scrollable</code> interface. It determines the preferred
     * size of the display area.
     */
    protected int                     visibleRowCount;

    /**
     * If true, when editing is to be stopped by way of selection changing,
     * data in tree changing or other means <code>stopCellEditing</code>
     * is invoked, and changes are saved. If false,
     * <code>cancelCellEditing</code> is invoked, and changes
     * are discarded. Default is false.
     */
    protected boolean                 invokesStopCellEditing;

    /**
     * If true, when a node is expanded, as many of the descendants are 
     * scrolled to be visible.
     */
    protected boolean                 scrollsOnExpand;
    private boolean                   scrollsOnExpandSet = false;

    /**
     * Number of mouse clicks before a node is expanded.
     */
    protected int                     toggleClickCount;

    /**
     * Updates the <code>expandedState</code>.
     */
    transient protected TreeModelListener       treeModelListener;

    /**
     * Used when <code>setExpandedState</code> is invoked,
     * will be a <code>Stack</code> of <code>Stack</code>s.
     */
    transient private Stack           expandedStack;

    /**
     * Lead selection path, may not be <code>null</code>.
     */
    private TreePath                  leadPath;

    /**
     * Anchor path.
     */
    private TreePath                  anchorPath;

    /**
     * True if paths in the selection should be expanded.
     */
    private boolean                   expandsSelectedPaths;

    /**
     * This is set to true for the life of the <code>setUI</code> call.
     */
    private boolean                   settingUI;

    /** If true, mouse presses on selections initiate a drag operation. */
    private boolean dragEnabled;

    /**
     * The drop mode for this component.
     */
    private DropMode dropMode = DropMode.USE_SELECTION;

    /**
     * The drop location.
     */
    private transient DropLocation dropLocation;

    /**
     * A subclass of <code>TransferHandler.DropLocation</code> representing
     * a drop location for a <code>JTree</code>.
     *
     * @see #getDropLocation
     * @since 1.6
     */
    public static final class DropLocation extends TransferHandler.DropLocation {
        private final TreePath path;
        private final int index;

        private DropLocation(Point p, TreePath path, int index) {
            super(p);
            this.path = path;
            this.index = index;
        }

        /**
         * Returns the index where the dropped data should be inserted
         * with respect to the path returned by <code>getPath()</code>.
         * <p>
         * For drop modes <code>DropMode.USE_SELECTION</code> and
         * <code>DropMode.ON</code>, this index is unimportant (and it will
         * always be <code>-1</code>) as the only interesting data is the
         * path over which the drop operation occurred.
         * <p>
         * For drop mode <code>DropMode.INSERT</code>, this index
         * indicates the index at which the data should be inserted into
         * the parent path represented by <code>getPath()</code>.
         * <code>-1</code> indicates that the drop occurred over the
         * parent itself, and in most cases should be treated as inserting
         * into either the beginning or the end of the parent's list of
         * children.
         * <p>
         * For <code>DropMode.ON_OR_INSERT</code>, this value will be
         * an insert index, as described above, or <code>-1</code> if
         * the drop occurred over the path itself.
         *
         * @return the child index
         * @see #getPath
         */
        public int getChildIndex() {
            return index;
        }

        /**
         * Returns the path where dropped data should be placed in the
         * tree.
         * <p>
         * Interpretation of this value depends on the drop mode set on the
         * component. If the drop mode is <code>DropMode.USE_SELECTION</code>
         * or <code>DropMode.ON</code>, the return value is the path in the
         * tree over which the data has been (or will be) dropped.
         * <code>null</code> indicates that the drop is over empty space,
         * not associated with a particular path.
         * <p>
         * If the drop mode is <code>DropMode.INSERT</code>, the return value
         * refers to the path that should become the parent of the new data,
         * in which case <code>getChildIndex()</code> indicates where the
         * new item should be inserted into this parent path. A
         * <code>null</code> path indicates that no parent path has been
         * determined, which can happen for multiple reasons:
         * <ul>
         *    <li>The tree has no model
         *    <li>There is no root in the tree
         *    <li>The root is collapsed
         *    <li>The root is a leaf node
         * </ul>
         * It is up to the developer to decide if and how they wish to handle
         * the <code>null</code> case. 
         * <p>
         * If the drop mode is <code>DropMode.ON_OR_INSERT</code>,
         * <code>getChildIndex</code> can be used to determine whether the
         * drop is on top of the path itself (<code>-1</code>) or the index
         * at which it should be inserted into the path (values other than
         * <code>-1</code>).
         *
         * @return the drop path
         * @see #getChildIndex
         */
        public TreePath getPath() {
            return path;
        }

        /**
         * Returns a string representation of this drop location.
         * This method is intended to be used for debugging purposes,
         * and the content and format of the returned string may vary
         * between implementations.
         *
         * @return a string representation of this drop location
         */
        public String toString() {
            return getClass().getName()
                   + "[dropPoint=" + getDropPoint() + ","
                   + "path=" + path + ","
                   + "childIndex=" + index + "]";
        }
    }

    /**
     * The row to expand during DnD.
     */
    private int expandRow = -1;

    private class TreeTimer extends Timer {
        public TreeTimer() {
            super(2000, null);
            setRepeats(false);
        }

        public void fireActionPerformed(ActionEvent ae) {
            JTree.this.expandRow(expandRow);
        }
    }

    /**
     * A timer to expand nodes during drop.
     */
    private TreeTimer dropTimer;

    /**
     * When <code>addTreeExpansionListener</code> is invoked,
     * and <code>settingUI</code> is true, this ivar gets set to the passed in
     * <code>Listener</code>. This listener is then notified first in
     * <code>fireTreeCollapsed</code> and <code>fireTreeExpanded</code>.
     * <p>This is an ugly workaround for a way to have the UI listener
     * get notified before other listeners.
     */
    private transient TreeExpansionListener     uiTreeExpansionListener;

    /**
     * Max number of stacks to keep around.
     */
    private static int                TEMP_STACK_SIZE = 11;

    //
    // Bound property names
    //
    /** Bound property name for <code>cellRenderer</code>. */
    public final static String        CELL_RENDERER_PROPERTY = "cellRenderer";
    /** Bound property name for <code>treeModel</code>. */
    public final static String        TREE_MODEL_PROPERTY = "model";
    /** Bound property name for <code>rootVisible</code>. */
    public final static String        ROOT_VISIBLE_PROPERTY = "rootVisible";
    /** Bound property name for <code>showsRootHandles</code>. */
    public final static String        SHOWS_ROOT_HANDLES_PROPERTY = "showsRootHandles";
    /** Bound property name for <code>rowHeight</code>. */
    public final static String        ROW_HEIGHT_PROPERTY = "rowHeight";
    /** Bound property name for <code>cellEditor</code>. */
    public final static String        CELL_EDITOR_PROPERTY = "cellEditor";
    /** Bound property name for <code>editable</code>. */
    public final static String        EDITABLE_PROPERTY = "editable";
    /** Bound property name for <code>largeModel</code>. */
    public final static String        LARGE_MODEL_PROPERTY = "largeModel";
    /** Bound property name for selectionModel. */
    public final static String        SELECTION_MODEL_PROPERTY = "selectionModel";
    /** Bound property name for <code>visibleRowCount</code>. */
    public final static String        VISIBLE_ROW_COUNT_PROPERTY = "visibleRowCount";
    /** Bound property name for <code>messagesStopCellEditing</code>. */
    public final static String        INVOKES_STOP_CELL_EDITING_PROPERTY = "invokesStopCellEditing";
    /** Bound property name for <code>scrollsOnExpand</code>. */
    public final static String        SCROLLS_ON_EXPAND_PROPERTY = "scrollsOnExpand";
    /** Bound property name for <code>toggleClickCount</code>. */
    public final static String        TOGGLE_CLICK_COUNT_PROPERTY = "toggleClickCount";
    /** Bound property name for <code>leadSelectionPath</code>.
     * @since 1.3 */
    public final static String        LEAD_SELECTION_PATH_PROPERTY = "leadSelectionPath";
    /** Bound property name for anchor selection path.
     * @since 1.3 */
    public final static String        ANCHOR_SELECTION_PATH_PROPERTY = "anchorSelectionPath";
    /** Bound property name for expands selected paths property
     * @since 1.3 */
    public final static String        EXPANDS_SELECTED_PATHS_PROPERTY = "expandsSelectedPaths";


    /**
     * Creates and returns a sample <code>TreeModel</code>.
     * Used primarily for beanbuilders to show something interesting.
     *
     * @return the default <code>TreeModel</code>
     */
    protected static TreeModel getDefaultTreeModel() {
        DefaultMutableTreeNode      root = new DefaultMutableTreeNode("JTree");
	DefaultMutableTreeNode      parent;

	parent = new DefaultMutableTreeNode("colors");
	root.add(parent);
	parent.add(new DefaultMutableTreeNode("blue"));
	parent.add(new DefaultMutableTreeNode("violet"));
	parent.add(new DefaultMutableTreeNode("red"));
	parent.add(new DefaultMutableTreeNode("yellow"));

	parent = new DefaultMutableTreeNode("sports");
	root.add(parent);
	parent.add(new DefaultMutableTreeNode("basketball"));
	parent.add(new DefaultMutableTreeNode("soccer"));
	parent.add(new DefaultMutableTreeNode("football"));
	parent.add(new DefaultMutableTreeNode("hockey"));

	parent = new DefaultMutableTreeNode("food");
	root.add(parent);
	parent.add(new DefaultMutableTreeNode("hot dogs"));
	parent.add(new DefaultMutableTreeNode("pizza"));
	parent.add(new DefaultMutableTreeNode("ravioli"));
	parent.add(new DefaultMutableTreeNode("bananas"));
        return new DefaultTreeModel(root);
    }

    /**
     * Returns a <code>TreeModel</code> wrapping the specified object.
     * If the object is:<ul>
     * <li>an array of <code>Object</code>s,
     * <li>a <code>Hashtable</code>, or
     * <li>a <code>Vector</code>
     * </ul>then a new root node is created with each of the incoming 
     * objects as children. Otherwise, a new root is created with the 
     * specified object as its value.
     *
     * @param value  the <code>Object</code> used as the foundation for
     *		the <code>TreeModel</code>
     * @return a <code>TreeModel</code> wrapping the specified object
     */
    protected static TreeModel createTreeModel(Object value) {
        DefaultMutableTreeNode           root;

        if((value instanceof Object[]) || (value instanceof Hashtable) ||
           (value instanceof Vector)) {
            root = new DefaultMutableTreeNode("root");
            DynamicUtilTreeNode.createChildren(root, value);
        }
        else {
            root = new DynamicUtilTreeNode("root", value);
        }
        return new DefaultTreeModel(root, false);
    }

    /**
     * Returns a <code>JTree</code> with a sample model.
     * The default model used by the tree defines a leaf node as any node
     * without children.
     *
     * @see DefaultTreeModel#asksAllowsChildren
     */
    public JTree() {
        this(getDefaultTreeModel());
    }

    /**
     * Returns a <code>JTree</code> with each element of the
     * specified array as the
     * child of a new root node which is not displayed.
     * By default, the tree defines a leaf node as any node without
     * children.
     *
     * @param value  an array of <code>Object</code>s
     * @see DefaultTreeModel#asksAllowsChildren
     */
    public JTree(Object[] value) {
        this(createTreeModel(value));
        this.setRootVisible(false);
        this.setShowsRootHandles(true);
        expandRoot();
    }

    /**
     * Returns a <code>JTree</code> with each element of the specified
     * <code>Vector</code> as the
     * child of a new root node which is not displayed. By default, the
     * tree defines a leaf node as any node without children.
     *
     * @param value  a <code>Vector</code>
     * @see DefaultTreeModel#asksAllowsChildren
     */
    public JTree(Vector<?> value) {
        this(createTreeModel(value));
        this.setRootVisible(false);
        this.setShowsRootHandles(true);
        expandRoot();
    }

    /**
     * Returns a <code>JTree</code> created from a <code>Hashtable</code>
     * which does not display with root.
     * Each value-half of the key/value pairs in the <code>HashTable</code>
     * becomes a child of the new root node. By default, the tree defines
     * a leaf node as any node without children.
     *
     * @param value  a <code>Hashtable</code>
     * @see DefaultTreeModel#asksAllowsChildren
     */
    public JTree(Hashtable<?,?> value) {
        this(createTreeModel(value));
        this.setRootVisible(false);
        this.setShowsRootHandles(true);
        expandRoot();
    }

    /**
     * Returns a <code>JTree</code> with the specified
     * <code>TreeNode</code> as its root,
     * which displays the root node.
     * By default, the tree defines a leaf node as any node without children.
     *
     * @param root  a <code>TreeNode</code> object
     * @see DefaultTreeModel#asksAllowsChildren
     */
    public JTree(TreeNode root) {
        this(root, false);
    }

    /**
     * Returns a <code>JTree</code> with the specified <code>TreeNode</code>
     * as its root, which 
     * displays the root node and which decides whether a node is a 
     * leaf node in the specified manner.
     *
     * @param root  a <code>TreeNode</code> object
     * @param asksAllowsChildren  if false, any node without children is a 
     *              leaf node; if true, only nodes that do not allow 
     *              children are leaf nodes
     * @see DefaultTreeModel#asksAllowsChildren
     */
    public JTree(TreeNode root, boolean asksAllowsChildren) {
        this(new DefaultTreeModel(root, asksAllowsChildren));
    }

    /**
     * Returns an instance of <code>JTree</code> which displays the root node 
     * -- the tree is created using the specified data model.
     *
     * @param newModel  the <code>TreeModel</code> to use as the data model
     */
    public JTree(TreeModel newModel) {
        super();
	expandedStack = new Stack();
	toggleClickCount = 2;
	expandedState = new Hashtable();
        setLayout(null);
        rowHeight = 16;
        visibleRowCount = 20;
        rootVisible = true;
        selectionModel = new DefaultTreeSelectionModel();
        cellRenderer = null;
	scrollsOnExpand = true;
        setOpaque(true);
	expandsSelectedPaths = true;
        updateUI();
        setModel(newModel);
    }

    /**
     * Returns the L&F object that renders this component.
     *
     * @return the <code>TreeUI</code> object that renders this component
     */
    public TreeUI getUI() {
        return (TreeUI)ui;
    }

    /**
     * Sets the L&F object that renders this component.
     *
     * @param ui  the <code>TreeUI</code> L&F object
     * @see UIDefaults#getUI
     * @beaninfo
     *        bound: true
     *       hidden: true
     *    attribute: visualUpdate true
     *  description: The UI object that implements the Component's LookAndFeel. 
     */
    public void setUI(TreeUI ui) {
        if ((TreeUI)this.ui != ui) {
	    settingUI = true;
	    uiTreeExpansionListener = null;
	    try {
		super.setUI(ui);
	    }
	    finally {
		settingUI = false;
	    }
        }
    }

    /**
     * Notification from the <code>UIManager</code> that the L&F has changed. 
     * Replaces the current UI object with the latest version from the 
     * <code>UIManager</code>.
     *
     * @see JComponent#updateUI
     */
    public void updateUI() {
        setUI((TreeUI)UIManager.getUI(this));

        TreeCellRenderer renderer = getCellRenderer();
        if (renderer instanceof Component) {
            SwingUtilities.updateComponentTreeUI((Component)renderer);
        }

        TreeCellEditor editor = getCellEditor();
        if (editor instanceof Component) {
            SwingUtilities.updateComponentTreeUI((Component)editor);
        } else if (editor instanceof DefaultCellEditor) {
            Component comp = ((DefaultCellEditor)editor).getComponent();
            if (comp != null) {
                SwingUtilities.updateComponentTreeUI(comp);
            }
        }
    }


    /**
     * Returns the name of the L&F class that renders this component.
     *
     * @return the string "TreeUI"
     * @see JComponent#getUIClassID
     * @see UIDefaults#getUI
     */
    public String getUIClassID() {
        return uiClassID;
    }


    /**
     * Returns the current <code>TreeCellRenderer</code>
     *  that is rendering each cell.
     *
     * @return the <code>TreeCellRenderer</code> that is rendering each cell
     */
    public TreeCellRenderer getCellRenderer() {
        return cellRenderer;
    }

    /**
     * Sets the <code>TreeCellRenderer</code> that will be used to
     * draw each cell.
     *
     * @param x  the <code>TreeCellRenderer</code> that is to render each cell
     * @beaninfo
     *        bound: true
     *  description: The TreeCellRenderer that will be used to draw
     *               each cell.
     */
    public void setCellRenderer(TreeCellRenderer x) {
        TreeCellRenderer oldValue = cellRenderer;

        cellRenderer = x;
        firePropertyChange(CELL_RENDERER_PROPERTY, oldValue, cellRenderer);
        invalidate();
    }

    /**
      * Determines whether the tree is editable. Fires a property
      * change event if the new setting is different from the existing
      * setting.
      *
      * @param flag  a boolean value, true if the tree is editable
      * @beaninfo
      *        bound: true
      *  description: Whether the tree is editable.
      */
    public void setEditable(boolean flag) {
        boolean                 oldValue = this.editable;

        this.editable = flag;
        firePropertyChange(EDITABLE_PROPERTY, oldValue, flag);
        if (accessibleContext != null) {
            accessibleContext.firePropertyChange(
                AccessibleContext.ACCESSIBLE_STATE_PROPERTY, 
                (oldValue ? AccessibleState.EDITABLE : null),
                (flag ? AccessibleState.EDITABLE : null));
        }
    }

    /**
     * Returns true if the tree is editable.
     *
     * @return true if the tree is editable
     */
    public boolean isEditable() {
        return editable;
    }

    /**
     * Sets the cell editor.  A <code>null</code> value implies that the
     * tree cannot be edited.  If this represents a change in the
     * <code>cellEditor</code>, the <code>propertyChange</code>
     * method is invoked on all listeners.
     *
     * @param cellEditor the <code>TreeCellEditor</code> to use
     * @beaninfo
     *        bound: true
     *  description: The cell editor. A null value implies the tree
     *               cannot be edited.
     */
    public void setCellEditor(TreeCellEditor cellEditor) {
        TreeCellEditor        oldEditor = this.cellEditor;

        this.cellEditor = cellEditor;
        firePropertyChange(CELL_EDITOR_PROPERTY, oldEditor, cellEditor);
        invalidate();
    }

    /**
     * Returns the editor used to edit entries in the tree.
     *
     * @return the <code>TreeCellEditor</code> in use,
     *		or <code>null</code> if the tree cannot be edited
     */
    public TreeCellEditor getCellEditor() {
        return cellEditor;
    }

    /**
     * Returns the <code>TreeModel</code> that is providing the data.
     *
     * @return the <code>TreeModel</code> that is providing the data
     */
    public TreeModel getModel() {
        return treeModel;
    }

    /**
     * Sets the <code>TreeModel</code> that will provide the data.
     *
     * @param newModel the <code>TreeModel</code> that is to provide the data
     * @beaninfo
     *        bound: true
     *  description: The TreeModel that will provide the data.
     */
    public void setModel(TreeModel newModel) {
        clearSelection();

        TreeModel oldModel = treeModel;

	if(treeModel != null && treeModelListener != null)
	    treeModel.removeTreeModelListener(treeModelListener);

        if (accessibleContext != null) {
	    if (treeModel != null) {
                treeModel.removeTreeModelListener((TreeModelListener)accessibleContext);
	    }
            if (newModel != null) {
	        newModel.addTreeModelListener((TreeModelListener)accessibleContext);
	    }
        }

        treeModel = newModel;
	clearToggledPaths();
	if(treeModel != null) {
	    if(treeModelListener == null)
		treeModelListener = createTreeModelListener();
	    if(treeModelListener != null)
		treeModel.addTreeModelListener(treeModelListener);
	    // Mark the root as expanded, if it isn't a leaf.
	    if(treeModel.getRoot() != null &&
               !treeModel.isLeaf(treeModel.getRoot())) {
		expandedState.put(new TreePath(treeModel.getRoot()),
				  Boolean.TRUE);
            }
	}
        firePropertyChange(TREE_MODEL_PROPERTY, oldModel, treeModel);
        invalidate();
    }

    /**
     * Returns true if the root node of the tree is displayed.
     *
     * @return true if the root node of the tree is displayed
     * @see #rootVisible
     */
    public boolean isRootVisible() {
        return rootVisible;
    }

    /**
     * Determines whether or not the root node from
     * the <code>TreeModel</code> is visible.
     *
     * @param rootVisible true if the root node of the tree is to be displayed
     * @see #rootVisible
     * @beaninfo
     *        bound: true
     *  description: Whether or not the root node 
     *               from the TreeModel is visible.
     */
    public void setRootVisible(boolean rootVisible) {
        boolean                oldValue = this.rootVisible;

        this.rootVisible = rootVisible;
        firePropertyChange(ROOT_VISIBLE_PROPERTY, oldValue, this.rootVisible);
        if (accessibleContext != null) {
            ((AccessibleJTree)accessibleContext).fireVisibleDataPropertyChange();
        }
    }

    /**
     * Sets the value of the <code>showsRootHandles</code> property,
     * which specifies whether the node handles should be displayed.
     * The default value of this property depends on the constructor
     * used to create the <code>JTree</code>.
     * Some look and feels might not support handles;
     * they will ignore this property.
     *
     * @param newValue <code>true</code> if root handles should be displayed;
     *                 otherwise, <code>false</code>
     * @see #showsRootHandles
     * @see #getShowsRootHandles
     * @beaninfo
     *        bound: true
     *  description: Whether the node handles are to be
     *               displayed.
     */
    public void setShowsRootHandles(boolean newValue) {
        boolean                oldValue = showsRootHandles;
	TreeModel              model = getModel();

        showsRootHandles = newValue;
        showsRootHandlesSet = true;
        firePropertyChange(SHOWS_ROOT_HANDLES_PROPERTY, oldValue,
                           showsRootHandles);
        if (accessibleContext != null) {
            ((AccessibleJTree)accessibleContext).fireVisibleDataPropertyChange();
        }
        invalidate();
    }

    /**
     * Returns the value of the <code>showsRootHandles</code> property.
     * 
     * @return the value of the <code>showsRootHandles</code> property
     * @see #showsRootHandles
     */
    public boolean getShowsRootHandles()
    {
        return showsRootHandles;
    }

    /**
     * Sets the height of each cell, in pixels.  If the specified value
     * is less than or equal to zero the current cell renderer is
     * queried for each row's height.
     *
     * @param rowHeight the height of each cell, in pixels
     * @beaninfo
     *        bound: true
     *  description: The height of each cell.
     */
    public void setRowHeight(int rowHeight)
    {
        int                oldValue = this.rowHeight;

        this.rowHeight = rowHeight;
	rowHeightSet = true;
        firePropertyChange(ROW_HEIGHT_PROPERTY, oldValue, this.rowHeight);
        invalidate();
    }

    /**
     * Returns the height of each row.  If the returned value is less than
     * or equal to 0 the height for each row is determined by the
     * renderer.
     *
     */
    public int getRowHeight()
    {
        return rowHeight;
    }

    /**
     * Returns true if the height of each display row is a fixed size.
     *
     * @return true if the height of each row is a fixed size
     */
    public boolean isFixedRowHeight()
    {
        return (rowHeight > 0);
    }

    /**
     * Specifies whether the UI should use a large model.
     * (Not all UIs will implement this.) Fires a property change
     * for the LARGE_MODEL_PROPERTY.
     * 
     * @param newValue true to suggest a large model to the UI
     * @see #largeModel
     * @beaninfo
     *        bound: true
     *  description: Whether the UI should use a 
     *               large model.
     */
    public void setLargeModel(boolean newValue) {
        boolean                oldValue = largeModel;

        largeModel = newValue;
        firePropertyChange(LARGE_MODEL_PROPERTY, oldValue, newValue);
    }

    /**
     * Returns true if the tree is configured for a large model.
     * 
     * @return true if a large model is suggested
     * @see #largeModel
     */
    public boolean isLargeModel() {
        return largeModel;
    }

    /**
     * Determines what happens when editing is interrupted by selecting
     * another node in the tree, a change in the tree's data, or by some
     * other means. Setting this property to <code>true</code> causes the
     * changes to be automatically saved when editing is interrupted.
     * <p>
     * Fires a property change for the INVOKES_STOP_CELL_EDITING_PROPERTY.
     *
     * @param newValue true means that <code>stopCellEditing</code> is invoked 
     *        when editing is interrupted, and data is saved; false means that
     *        <code>cancelCellEditing</code> is invoked, and changes are lost
     * @beaninfo
     *        bound: true
     *  description: Determines what happens when editing is interrupted,
     *               selecting another node in the tree, a change in the
     *               tree's data, or some other means.
     */
    public void setInvokesStopCellEditing(boolean newValue) {
        boolean                  oldValue = invokesStopCellEditing;

        invokesStopCellEditing = newValue;
        firePropertyChange(INVOKES_STOP_CELL_EDITING_PROPERTY, oldValue,
                           newValue);
    }

    /**
     * Returns the indicator that tells what happens when editing is 
     * interrupted.
     *
     * @return the indicator that tells what happens when editing is 
     *         interrupted
     * @see #setInvokesStopCellEditing
     */
    public boolean getInvokesStopCellEditing() {
        return invokesStopCellEditing;
    }

    /**
     * Sets the <code>scrollsOnExpand</code> property,
     * which determines whether the 
     * tree might scroll to show previously hidden children.
     * If this property is <code>true</code> (the default), 
     * when a node expands
     * the tree can use scrolling to make
     * the maximum possible number of the node's descendants visible.
     * In some look and feels, trees might not need to scroll when expanded;
     * those look and feels will ignore this property.
     *
     * @param newValue <code>false</code> to disable scrolling on expansion;
     *                 <code>true</code> to enable it
     * @see #getScrollsOnExpand
     *
     * @beaninfo
     *        bound: true
     *  description: Indicates if a node descendant should be scrolled when expanded.
     */
    public void setScrollsOnExpand(boolean newValue) {
	boolean           oldValue = scrollsOnExpand;

	scrollsOnExpand = newValue;
	scrollsOnExpandSet = true;
        firePropertyChange(SCROLLS_ON_EXPAND_PROPERTY, oldValue,
                           newValue);
    }

    /**
     * Returns the value of the <code>scrollsOnExpand</code> property.
     *
     * @return the value of the <code>scrollsOnExpand</code> property
     */
    public boolean getScrollsOnExpand() {
	return scrollsOnExpand;
    }

    /**
     * Sets the number of mouse clicks before a node will expand or close.
     * The default is two. 
     *
     * @since 1.3
     * @beaninfo
     *        bound: true
     *  description: Number of clicks before a node will expand/collapse.
     */
    public void setToggleClickCount(int clickCount) {
	int         oldCount = toggleClickCount;

	toggleClickCount = clickCount;
	firePropertyChange(TOGGLE_CLICK_COUNT_PROPERTY, oldCount,
			   clickCount);
    }

    /**
     * Returns the number of mouse clicks needed to expand or close a node.
     *
     * @return number of mouse clicks before node is expanded
     * @since 1.3
     */
    public int getToggleClickCount() {
	return toggleClickCount;
    }

    /**
     * Configures the <code>expandsSelectedPaths</code> property. If
     * true, any time the selection is changed, either via the
     * <code>TreeSelectionModel</code>, or the cover methods provided by 
     * <code>JTree</code>, the <code>TreePath</code>s parents will be
     * expanded to make them visible (visible meaning the parent path is
     * expanded, not necessarily in the visible rectangle of the
     * <code>JTree</code>). If false, when the selection
     * changes the nodes parent is not made visible (all its parents expanded).
     * This is useful if you wish to have your selection model maintain paths
     * that are not always visible (all parents expanded).
     *
     * @param newValue the new value for <code>expandsSelectedPaths</code>
     *
     * @since 1.3
     * @beaninfo
     *        bound: true
     *  description: Indicates whether changes to the selection should make
     *               the parent of the path visible.
     */
    public void setExpandsSelectedPaths(boolean newValue) {
	boolean         oldValue = expandsSelectedPaths;

	expandsSelectedPaths = newValue;
	firePropertyChange(EXPANDS_SELECTED_PATHS_PROPERTY, oldValue,
			   newValue);
    }

    /**
     * Returns the <code>expandsSelectedPaths</code> property.
     * @return true if selection changes result in the parent path being
     *         expanded
     * @since 1.3
     * @see #setExpandsSelectedPaths
     */
    public boolean getExpandsSelectedPaths() {
	return expandsSelectedPaths;
    }

    /**
     * Turns on or off automatic drag handling. In order to enable automatic
     * drag handling, this property should be set to {@code true}, and the
     * tree's {@code TransferHandler} needs to be {@code non-null}.
     * The default value of the {@code dragEnabled} property is {@code false}.
     * <p>
     * The job of honoring this property, and recognizing a user drag gesture,
     * lies with the look and feel implementation, and in particular, the tree's
     * {@code TreeUI}. When automatic drag handling is enabled, most look and
     * feels (including those that subclass {@code BasicLookAndFeel}) begin a
     * drag and drop operation whenever the user presses the mouse button over
     * an item and then moves the mouse a few pixels. Setting this property to
     * {@code true} can therefore have a subtle effect on how selections behave.
     * <p>
     * If a look and feel is used that ignores this property, you can still
     * begin a drag and drop operation by calling {@code exportAsDrag} on the
     * tree's {@code TransferHandler}.
     *
     * @param b whether or not to enable automatic drag handling
     * @exception HeadlessException if
     *            <code>b</code> is <code>true</code> and
     *            <code>GraphicsEnvironment.isHeadless()</code>
     *            returns <code>true</code>
     * @see java.awt.GraphicsEnvironment#isHeadless
     * @see #getDragEnabled
     * @see #setTransferHandler
     * @see TransferHandler
     * @since 1.4
     *
     * @beaninfo
     *  description: determines whether automatic drag handling is enabled
     *        bound: false
     */
    public void setDragEnabled(boolean b) {
        if (b && GraphicsEnvironment.isHeadless()) {
            throw new HeadlessException();
        }
	dragEnabled = b;
    }

    /**
     * Returns whether or not automatic drag handling is enabled.
     *
     * @return the value of the {@code dragEnabled} property
     * @see #setDragEnabled
     * @since 1.4
     */
    public boolean getDragEnabled() {
	return dragEnabled;
    }

    /**
     * Sets the drop mode for this component. For backward compatibility,
     * the default for this property is <code>DropMode.USE_SELECTION</code>.
     * Usage of one of the other modes is recommended, however, for an
     * improved user experience. <code>DropMode.ON</code>, for instance,
     * offers similar behavior of showing items as selected, but does so without
     * affecting the actual selection in the tree.
     * <p>
     * <code>JTree</code> supports the following drop modes:
     * <ul>
     *    <li><code>DropMode.USE_SELECTION</code></li>
     *    <li><code>DropMode.ON</code></li>
     *    <li><code>DropMode.INSERT</code></li>
     *    <li><code>DropMode.ON_OR_INSERT</code></li>
     * </ul>
     * <p>
     * The drop mode is only meaningful if this component has a
     * <code>TransferHandler</code> that accepts drops.
     *
     * @param dropMode the drop mode to use
     * @throws IllegalArgumentException if the drop mode is unsupported
     *         or <code>null</code>
     * @see #getDropMode
     * @see #getDropLocation
     * @see #setTransferHandler
     * @see TransferHandler
     * @since 1.6
     */
    public final void setDropMode(DropMode dropMode) {
        if (dropMode != null) {
            switch (dropMode) {
                case USE_SELECTION:
                case ON:
                case INSERT:
                case ON_OR_INSERT:
                    this.dropMode = dropMode;
                    return;
            }
        }

        throw new IllegalArgumentException(dropMode + ": Unsupported drop mode for tree");
    }

    /**
     * Returns the drop mode for this component.
     *
     * @return the drop mode for this component
     * @see #setDropMode
     * @since 1.6
     */
    public final DropMode getDropMode() {
        return dropMode;
    }

    /**
     * Calculates a drop location in this component, representing where a
     * drop at the given point should insert data.
     *
     * @param p the point to calculate a drop location for
     * @return the drop location, or <code>null</code>
     */
    DropLocation dropLocationForPoint(Point p) {
        DropLocation location = null;

        int row = getClosestRowForLocation(p.x, p.y);
        Rectangle bounds = getRowBounds(row);
        TreeModel model = getModel();
        Object root = (model == null) ? null : model.getRoot();
        TreePath rootPath = (root == null) ? null : new TreePath(root);

        TreePath child = null;
        TreePath parent = null;
        boolean outside = row == -1
                          || p.y < bounds.y
                          || p.y >= bounds.y + bounds.height;

        switch(dropMode) {
            case USE_SELECTION:
            case ON:
                if (outside) {
                    location = new DropLocation(p, null, -1);
                } else {
                    location = new DropLocation(p, getPathForRow(row), -1);
                }

                break;
            case INSERT:
            case ON_OR_INSERT:
                if (row == -1) {
                    if (root != null && !model.isLeaf(root) && isExpanded(rootPath)) {
                        location = new DropLocation(p, rootPath, 0);                        
                    } else {
                        location = new DropLocation(p, null, -1);
                    }

                    break;
                }

                boolean checkOn = dropMode == DropMode.ON_OR_INSERT
                                  || !model.isLeaf(getPathForRow(row).getLastPathComponent());

                Section section = SwingUtilities2.liesInVertical(bounds, p, checkOn);
                if(section == LEADING) {
                    child = getPathForRow(row);
                    parent = child.getParentPath();
                } else if (section == TRAILING) {
                    int index = row + 1;
                    if (index >= getRowCount()) {
                        if (model.isLeaf(root) || !isExpanded(rootPath)) {
                            location = new DropLocation(p, null, -1);
                        } else {
                            parent = rootPath;
                            index = model.getChildCount(root);
                            location = new DropLocation(p, parent, index);
                        }

                        break;
                    }

                    child = getPathForRow(index);
                    parent = child.getParentPath();
                } else {
                    assert checkOn;
                    location = new DropLocation(p, getPathForRow(row), -1);
                    break;
                }

                if (parent != null) {
                    location = new DropLocation(p, parent,
                        model.getIndexOfChild(parent.getLastPathComponent(),
                                              child.getLastPathComponent()));
                } else if (checkOn || !model.isLeaf(root)) {
                    location = new DropLocation(p, rootPath, -1);
                } else {
                    location = new DropLocation(p, null, -1);
                }

                break;
            default:
                assert false : "Unexpected drop mode";
        }

        if (outside || row != expandRow) {
            cancelDropTimer();
        }

        if (!outside && row != expandRow) {
            if (isCollapsed(row)) {
                expandRow = row;
                startDropTimer();
            }
        }

        return location;
    }

    /**
     * Called to set or clear the drop location during a DnD operation.
     * In some cases, the component may need to use it's internal selection
     * temporarily to indicate the drop location. To help facilitate this,
     * this method returns and accepts as a parameter a state object.
     * This state object can be used to store, and later restore, the selection
     * state. Whatever this method returns will be passed back to it in
     * future calls, as the state parameter. If it wants the DnD system to
     * continue storing the same state, it must pass it back every time.
     * Here's how this is used:
     * <p>
     * Let's say that on the first call to this method the component decides
     * to save some state (because it is about to use the selection to show
     * a drop index). It can return a state object to the caller encapsulating
     * any saved selection state. On a second call, let's say the drop location
     * is being changed to something else. The component doesn't need to
     * restore anything yet, so it simply passes back the same state object
     * to have the DnD system continue storing it. Finally, let's say this
     * method is messaged with <code>null</code>. This means DnD
     * is finished with this component for now, meaning it should restore
     * state. At this point, it can use the state parameter to restore
     * said state, and of course return <code>null</code> since there's
     * no longer anything to store.
     *
     * @param location the drop location (as calculated by
     *        <code>dropLocationForPoint</code>) or <code>null</code>
     *        if there's no longer a valid drop location
     * @param state the state object saved earlier for this component,
     *        or <code>null</code>
     * @param forDrop whether or not the method is being called because an
     *        actual drop occurred
     * @return any saved state for this component, or <code>null</code> if none
     */
    Object setDropLocation(TransferHandler.DropLocation location,
                           Object state,
                           boolean forDrop) {

        Object retVal = null;
        DropLocation treeLocation = (DropLocation)location;

        if (dropMode == DropMode.USE_SELECTION) {
            if (treeLocation == null) {
                if (!forDrop && state != null) {
                    setSelectionPaths(((TreePath[][])state)[0]);
                    setAnchorSelectionPath(((TreePath[][])state)[1][0]);
                    setLeadSelectionPath(((TreePath[][])state)[1][1]);
                }
            } else {
                if (dropLocation == null) {
                    TreePath[] paths = getSelectionPaths();
                    if (paths == null) {
                        paths = new TreePath[0];
                    }

                    retVal = new TreePath[][] {paths,
                            {getAnchorSelectionPath(), getLeadSelectionPath()}};
                } else {
                    retVal = state;
                }

                setSelectionPath(treeLocation.getPath());
            }
        }

        DropLocation old = dropLocation;
        dropLocation = treeLocation;
        firePropertyChange("dropLocation", old, dropLocation);

        return retVal;
    }

    /**
     * Called to indicate to this component that DnD is done.
     * Allows for us to cancel the expand timer.
     */
    void dndDone() {
        cancelDropTimer();
        dropTimer = null;
    }

    /**
     * Returns the location that this component should visually indicate
     * as the drop location during a DnD operation over the component,
     * or {@code null} if no location is to currently be shown.
     * <p>
     * This method is not meant for querying the drop location
     * from a {@code TransferHandler}, as the drop location is only
     * set after the {@code TransferHandler}'s <code>canImport</code>
     * has returned and has allowed for the location to be shown.
     * <p>
     * When this property changes, a property change event with
     * name "dropLocation" is fired by the component.
     *
     * @return the drop location
     * @see #setDropMode
     * @see TransferHandler#canImport(TransferHandler.TransferSupport)
     * @since 1.6
     */
    public final DropLocation getDropLocation() {
        return dropLocation;
    }

    private void startDropTimer() {
        if (dropTimer == null) {
            dropTimer = new TreeTimer();
        }
        dropTimer.start();
    }

    private void cancelDropTimer() {
        if (dropTimer != null && dropTimer.isRunning()) {
            expandRow = -1;
            dropTimer.stop();
        }
    }

    /**
     * Returns <code>isEditable</code>. This is invoked from the UI before
     * editing begins to insure that the given path can be edited. This
     * is provided as an entry point for subclassers to add filtered
     * editing without having to resort to creating a new editor.
     *
     * @return true if every parent node and the node itself is editable
     * @see #isEditable
     */
    public boolean isPathEditable(TreePath path) {
        return isEditable();
    }

    /**
     * Overrides <code>JComponent</code>'s <code>getToolTipText</code>
     * method in order to allow 
     * renderer's tips to be used if it has text set.
     * <p>
     * NOTE: For <code>JTree</code> to properly display tooltips of its
     * renderers, <code>JTree</code> must be a registered component with the
     * <code>ToolTipManager</code>.  This can be done by invoking
     * <code>ToolTipManager.sharedInstance().registerComponent(tree)</code>.
     * This is not done automatically!
     *
     * @param event the <code>MouseEvent</code> that initiated the 
     *		<code>ToolTip</code> display
     * @return a string containing the  tooltip or <code>null</code>
     *		if <code>event</code> is null
     */
    public String getToolTipText(MouseEvent event) {
        String tip = null;

        if(event != null) {
            Point p = event.getPoint();
            int selRow = getRowForLocation(p.x, p.y);
            TreeCellRenderer       r = getCellRenderer();

            if(selRow != -1 && r != null) {
                TreePath     path = getPathForRow(selRow);
                Object       lastPath = path.getLastPathComponent();
                Component    rComponent = r.getTreeCellRendererComponent
                    (this, lastPath, isRowSelected(selRow),
                     isExpanded(selRow), getModel().isLeaf(lastPath), selRow,
                     true);

                if(rComponent instanceof JComponent) {
                    MouseEvent      newEvent;
                    Rectangle       pathBounds = getPathBounds(path);

                    p.translate(-pathBounds.x, -pathBounds.y);
                    newEvent = new MouseEvent(rComponent, event.getID(),
                                          event.getWhen(),
                                              event.getModifiers(),
                                              p.x, p.y,
                                              event.getXOnScreen(),
                                              event.getYOnScreen(),
                                              event.getClickCount(),
                                              event.isPopupTrigger(),
                                              MouseEvent.NOBUTTON);
                    
                    tip = ((JComponent)rComponent).getToolTipText(newEvent);
                }
            }
        }
        // No tip from the renderer get our own tip
        if (tip == null) {
            tip = getToolTipText();
	}
        return tip;
    }
    
    /**
     * Called by the renderers to convert the specified value to
     * text. This implementation returns <code>value.toString</code>, ignoring
     * all other arguments. To control the conversion, subclass this 
     * method and use any of the arguments you need.
     * 
     * @param value the <code>Object</code> to convert to text
     * @param selected true if the node is selected
     * @param expanded true if the node is expanded
     * @param leaf  true if the node is a leaf node
     * @param row  an integer specifying the node's display row, where 0 is 
     *             the first row in the display
     * @param hasFocus true if the node has the focus
     * @return the <code>String</code> representation of the node's value
     */
    public String convertValueToText(Object value, boolean selected,
                                     boolean expanded, boolean leaf, int row,
                                     boolean hasFocus) {
        if(value != null) {
            String sValue = value.toString();
            if (sValue != null) {
                return sValue;
            }
        }
        return "";
    }

    //
    // The following are convenience methods that get forwarded to the
    // current TreeUI.
    //

    /**
     * Returns the number of rows that are currently being displayed.
     *
     * @return the number of rows that are being displayed
     */
    public int getRowCount() {
        TreeUI            tree = getUI();

        if(tree != null)
            return tree.getRowCount(this);
        return 0;
    }

    /** 
     * Selects the node identified by the specified path. If any
     * component of the path is hidden (under a collapsed node), and
     * <code>getExpandsSelectedPaths</code> is true it is 
     * exposed (made viewable).
     *
     * @param path the <code>TreePath</code> specifying the node to select
     */
    public void setSelectionPath(TreePath path) {
        getSelectionModel().setSelectionPath(path);
    }

    /** 
     * Selects the nodes identified by the specified array of paths.
     * If any component in any of the paths is hidden (under a collapsed
     * node), and <code>getExpandsSelectedPaths</code> is true
     * it is exposed (made viewable).
     *
     * @param paths an array of <code>TreePath</code> objects that specifies
     *		the nodes to select
     */
    public void setSelectionPaths(TreePath[] paths) {
        getSelectionModel().setSelectionPaths(paths);
    }

    /**
     * Sets the path identifies as the lead. The lead may not be selected.
     * The lead is not maintained by <code>JTree</code>,
     * rather the UI will update it.
     *
     * @param newPath  the new lead path
     * @since 1.3
     * @beaninfo
     *        bound: true
     *  description: Lead selection path
     */
    public void setLeadSelectionPath(TreePath newPath) {
	TreePath          oldValue = leadPath;

	leadPath = newPath;
	firePropertyChange(LEAD_SELECTION_PATH_PROPERTY, oldValue, newPath);
    }

    /**
     * Sets the path identified as the anchor.
     * The anchor is not maintained by <code>JTree</code>, rather the UI will 
     * update it.
     *
     * @param newPath  the new anchor path
     * @since 1.3
     * @beaninfo
     *        bound: true
     *  description: Anchor selection path
     */
    public void setAnchorSelectionPath(TreePath newPath) {
	TreePath          oldValue = anchorPath;

	anchorPath = newPath;
	firePropertyChange(ANCHOR_SELECTION_PATH_PROPERTY, oldValue, newPath);
    }

    /**
     * Selects the node at the specified row in the display.
     *
     * @param row  the row to select, where 0 is the first row in
     *             the display
     */
    public void setSelectionRow(int row) {
        int[]             rows = { row };

        setSelectionRows(rows);
    }

    /**
     * Selects the nodes corresponding to each of the specified rows
     * in the display. If a particular element of <code>rows</code> is
     * < 0 or >= <code>getRowCount</code>, it will be ignored.
     * If none of the elements
     * in <code>rows</code> are valid rows, the selection will
     * be cleared. That is it will be as if <code>clearSelection</code>
     * was invoked.
     * 
     * @param rows  an array of ints specifying the rows to select,
     *              where 0 indicates the first row in the display
     */
    public void setSelectionRows(int[] rows) {
        TreeUI               ui = getUI();

        if(ui != null && rows != null) {
            int                  numRows = rows.length;
            TreePath[]           paths = new TreePath[numRows];

            for(int counter = 0; counter < numRows; counter++) {
                paths[counter] = ui.getPathForRow(this, rows[counter]);
	    }
            setSelectionPaths(paths);
        }
    }

    /**
     * Adds the node identified by the specified <code>TreePath</code>
     * to the current selection. If any component of the path isn't
     * viewable, and <code>getExpandsSelectedPaths</code> is true it is 
     * made viewable.
     * <p>
     * Note that <code>JTree</code> does not allow duplicate nodes to
     * exist as children under the same parent -- each sibling must be
     * a unique object.
     *
     * @param path the <code>TreePath</code> to add
     */
    public void addSelectionPath(TreePath path) {
        getSelectionModel().addSelectionPath(path);
    }

    /**
     * Adds each path in the array of paths to the current selection. If
     * any component of any of the paths isn't viewable and
     * <code>getExpandsSelectedPaths</code> is true, it is
     * made viewable.
     * <p>
     * Note that <code>JTree</code> does not allow duplicate nodes to
     * exist as children under the same parent -- each sibling must be
     * a unique object.
     *
     * @param paths an array of <code>TreePath</code> objects that specifies
     *		the nodes to add
     */
    public void addSelectionPaths(TreePath[] paths) {
	getSelectionModel().addSelectionPaths(paths);
    }

    /**
     * Adds the path at the specified row to the current selection.
     *
     * @param row  an integer specifying the row of the node to add,
     *             where 0 is the first row in the display
     */
    public void addSelectionRow(int row) {
        int[]      rows = { row };

        addSelectionRows(rows);
    }

    /**
     * Adds the paths at each of the specified rows to the current selection.
     * 
     * @param rows  an array of ints specifying the rows to add,
     *              where 0 indicates the first row in the display
     */
    public void addSelectionRows(int[] rows) {
        TreeUI             ui = getUI();

        if(ui != null && rows != null) {
            int                  numRows = rows.length;
            TreePath[]           paths = new TreePath[numRows];

            for(int counter = 0; counter < numRows; counter++)
                paths[counter] = ui.getPathForRow(this, rows[counter]);
            addSelectionPaths(paths);
        }
    }

    /**
     * Returns the last path component in the first node of the current 
     * selection.
     *
     * @return the last <code>Object</code> in the first selected node's
     *		<code>TreePath</code>,
     *		or <code>null</code> if nothing is selected
     * @see TreePath#getLastPathComponent
     */
    public Object getLastSelectedPathComponent() {
        TreePath     selPath = getSelectionModel().getSelectionPath();

        if(selPath != null)
            return selPath.getLastPathComponent();
        return null;
    }

    /**
     * Returns the path identified as the lead.
     * @return path identified as the lead
     */
    public TreePath getLeadSelectionPath() {
	return leadPath;
    }

    /**
     * Returns the path identified as the anchor.
     * @return path identified as the anchor
     * @since 1.3
     */
    public TreePath getAnchorSelectionPath() {
	return anchorPath;
    }

    /**
     * Returns the path to the first selected node.
     *
     * @return the <code>TreePath</code> for the first selected node,
     *		or <code>null</code> if nothing is currently selected
     */
    public TreePath getSelectionPath() {
        return getSelectionModel().getSelectionPath();
    }

    /**
     * Returns the paths of all selected values.
     *
     * @return an array of <code>TreePath</code> objects indicating the selected
     *         nodes, or <code>null</code> if nothing is currently selected
     */
    public TreePath[] getSelectionPaths() {
        return getSelectionModel().getSelectionPaths();
    }

    /**
     * Returns all of the currently selected rows. This method is simply
     * forwarded to the <code>TreeSelectionModel</code>.
     * If nothing is selected <code>null</code> or an empty array will
     * be returned, based on the <code>TreeSelectionModel</code>
     * implementation.
     *
     * @return an array of integers that identifies all currently selected rows
     *         where 0 is the first row in the display
     */
    public int[] getSelectionRows() {
        return getSelectionModel().getSelectionRows();
    }

    /**
     * Returns the number of nodes selected.
     *
     * @return the number of nodes selected
     */
    public int getSelectionCount() {
        return selectionModel.getSelectionCount();
    }

    /**
     * Gets the first selected row.
     *
     * @return an integer designating the first selected row, where 0 is the 
     *         first row in the display
     */
    public int getMinSelectionRow() {
        return getSelectionModel().getMinSelectionRow();
    }

    /**
     * Returns the last selected row.
     *
     * @return an integer designating the last selected row, where 0 is the 
     *         first row in the display
     */
    public int getMaxSelectionRow() {
        return getSelectionModel().getMaxSelectionRow();
    }

    /**
     * Returns the row index corresponding to the lead path.
     *
     * @return an integer giving the row index of the lead path,
     *		where 0 is the first row in the display; or -1
     *		if <code>leadPath</code> is <code>null</code>
     */
    public int getLeadSelectionRow() {
	TreePath leadPath = getLeadSelectionPath();

	if (leadPath != null) {
	    return getRowForPath(leadPath);
	}
        return -1;
    }

    /**
     * Returns true if the item identified by the path is currently selected.
     *
     * @param path a <code>TreePath</code> identifying a node
     * @return true if the node is selected
     */
    public boolean isPathSelected(TreePath path) {
        return getSelectionModel().isPathSelected(path);
    }

    /**
     * Returns true if the node identified by row is selected.
     *
     * @param row  an integer specifying a display row, where 0 is the first
     *             row in the display
     * @return true if the node is selected
     */
    public boolean isRowSelected(int row) {
        return getSelectionModel().isRowSelected(row);
    }

    /**
     * Returns an <code>Enumeration</code> of the descendants of the
     * path <code>parent</code> that
     * are currently expanded. If <code>parent</code> is not currently
     * expanded, this will return <code>null</code>.
     * If you expand/collapse nodes while
     * iterating over the returned <code>Enumeration</code>
     * this may not return all
     * the expanded paths, or may return paths that are no longer expanded.
     *
     * @param parent  the path which is to be examined
     * @return an <code>Enumeration</code> of the descendents of 
     *		<code>parent</code>, or <code>null</code> if
     *		<code>parent</code> is not currently expanded
     */
    public Enumeration<TreePath> getExpandedDescendants(TreePath parent) {
	if(!isExpanded(parent))
	    return null;

	Enumeration       toggledPaths = expandedState.keys();
	Vector            elements = null;
	TreePath          path;
	Object            value;

	if(toggledPaths != null) {
	    while(toggledPaths.hasMoreElements()) {
		path = (TreePath)toggledPaths.nextElement();
		value = expandedState.get(path);
		// Add the path if it is expanded, a descendant of parent,
		// and it is visible (all parents expanded). This is rather
		// expensive!
		if(path != parent && value != null &&
		   ((Boolean)value).booleanValue() &&
		   parent.isDescendant(path) && isVisible(path)) {
		    if (elements == null) {
			elements = new Vector();
		    }
		    elements.addElement(path);
		}
	    }
	}
	if (elements == null) {
	    Set<TreePath> empty = Collections.emptySet();
	    return Collections.enumeration(empty);
	}
	return elements.elements();
    }

    /**
     * Returns true if the node identified by the path has ever been
     * expanded.
     * @return true if the <code>path</code> has ever been expanded
     */
    public boolean hasBeenExpanded(TreePath path) {
	return (path != null && expandedState.get(path) != null);
    }

    /**
     * Returns true if the node identified by the path is currently expanded,
     * 
     * @param path  the <code>TreePath</code> specifying the node to check
     * @return false if any of the nodes in the node's path are collapsed, 
     *               true if all nodes in the path are expanded
     */
    public boolean isExpanded(TreePath path) {
	if(path == null)
	    return false;

	// Is this node expanded?
	Object          value = expandedState.get(path);

	if(value == null || !((Boolean)value).booleanValue())
	    return false;

	// It is, make sure its parent is also expanded.
	TreePath        parentPath = path.getParentPath();

	if(parentPath != null)
	    return isExpanded(parentPath);
        return true;
    }

    /**
     * Returns true if the node at the specified display row is currently
     * expanded.
     * 
     * @param row  the row to check, where 0 is the first row in the 
     *             display
     * @return true if the node is currently expanded, otherwise false
     */
    public boolean isExpanded(int row) {
        TreeUI                  tree = getUI();

        if(tree != null) {
	    TreePath         path = tree.getPathForRow(this, row);

	    if(path != null) {
                Boolean value = (Boolean)expandedState.get(path);

                return (value != null && value.booleanValue());
            }
	}
        return false;
    }

    /**
     * Returns true if the value identified by path is currently collapsed,
     * this will return false if any of the values in path are currently
     * not being displayed.
     * 
     * @param path  the <code>TreePath</code> to check
     * @return true if any of the nodes in the node's path are collapsed, 
     *               false if all nodes in the path are expanded
     */
    public boolean isCollapsed(TreePath path) {
	return !isExpanded(path);
    }

    /**
     * Returns true if the node at the specified display row is collapsed.
     * 
     * @param row  the row to check, where 0 is the first row in the 
     *             display
     * @return true if the node is currently collapsed, otherwise false
     */
    public boolean isCollapsed(int row) {
	return !isExpanded(row);
    }

    /**
     * Ensures that the node identified by path is currently viewable.
     *
     * @param path  the <code>TreePath</code> to make visible
     */
    public void makeVisible(TreePath path) {
        if(path != null) {
	    TreePath        parentPath = path.getParentPath();

	    if(parentPath != null) {
		expandPath(parentPath);
	    }
        }
    }

    /**
     * Returns true if the value identified by path is currently viewable,
     * which means it is either the root or all of its parents are expanded.
     * Otherwise, this method returns false. 
     *
     * @return true if the node is viewable, otherwise false
     */
    public boolean isVisible(TreePath path) {
        if(path != null) {
	    TreePath        parentPath = path.getParentPath();

	    if(parentPath != null)
		return isExpanded(parentPath);
	    // Root.
	    return true;
	}
        return false;
    }

    /**
     * Returns the <code>Rectangle</code> that the specified node will be drawn
     * into. Returns <code>null</code> if any component in the path is hidden
     * (under a collapsed parent).
     * <p>
     * Note:<br>
     * This method returns a valid rectangle, even if the specified
     * node is not currently displayed.
     *
     * @param path the <code>TreePath</code> identifying the node
     * @return the <code>Rectangle</code> the node is drawn in,
     *		or <code>null</code> 
     */
    public Rectangle getPathBounds(TreePath path) {
        TreeUI                   tree = getUI();

        if(tree != null)
            return tree.getPathBounds(this, path);
        return null;
    }

    /**
     * Returns the <code>Rectangle</code> that the node at the specified row is
     * drawn in.
     *
     * @param row  the row to be drawn, where 0 is the first row in the 
     *             display
     * @return the <code>Rectangle</code> the node is drawn in 
     */
    public Rectangle getRowBounds(int row) {
	return getPathBounds(getPathForRow(row));
    }

    /**
     * Makes sure all the path components in path are expanded (except
     * for the last path component) and scrolls so that the 
     * node identified by the path is displayed. Only works when this
     * <code>JTree</code> is contained in a <code>JScrollPane</code>.
     * 
     * @param path  the <code>TreePath</code> identifying the node to
     * 		bring into view
     */
    public void scrollPathToVisible(TreePath path) {
	if(path != null) {
	    makeVisible(path);

	    Rectangle          bounds = getPathBounds(path);

	    if(bounds != null) {
		scrollRectToVisible(bounds);
		if (accessibleContext != null) {
		    ((AccessibleJTree)accessibleContext).fireVisibleDataPropertyChange();
		}
	    }
	}
    }

    /**
     * Scrolls the item identified by row until it is displayed. The minimum
     * of amount of scrolling necessary to bring the row into view
     * is performed. Only works when this <code>JTree</code> is contained in a
     * <code>JScrollPane</code>.
     *
     * @param row  an integer specifying the row to scroll, where 0 is the
     *             first row in the display
     */
    public void scrollRowToVisible(int row) {
	scrollPathToVisible(getPathForRow(row));
    }

    /**
     * Returns the path for the specified row.  If <code>row</code> is
     * not visible, <code>null</code> is returned.
     *
     * @param row  an integer specifying a row
     * @return the <code>TreePath</code> to the specified node,
     *		<code>null</code> if <code>row < 0</code>
     *		or <code>row > getRowCount()</code>
     */
    public TreePath getPathForRow(int row) {
        TreeUI                  tree = getUI();

        if(tree != null)
            return tree.getPathForRow(this, row);
        return null;
    }

    /**
     * Returns the row that displays the node identified by the specified
     * path. 
     * 
     * @param path  the <code>TreePath</code> identifying a node
     * @return an integer specifying the display row, where 0 is the first
     *         row in the display, or -1 if any of the elements in path
     *         are hidden under a collapsed parent.
     */
    public int getRowForPath(TreePath path) {
        TreeUI                  tree = getUI();

        if(tree != null)
            return tree.getRowForPath(this, path);
        return -1;
    }

    /**
     * Ensures that the node identified by the specified path is 
     * expanded and viewable. If the last item in the path is a
     * leaf, this will have no effect.
     * 
     * @param path  the <code>TreePath</code> identifying a node
     */
    public void expandPath(TreePath path) {
	// Only expand if not leaf!
	TreeModel          model = getModel();

	if(path != null && model != null && 
	   !model.isLeaf(path.getLastPathComponent())) {
	    setExpandedState(path, true);
	}
    }

    /**
     * Ensures that the node in the specified row is expanded and
     * viewable.
     * <p>
     * If <code>row</code> is < 0 or >= <code>getRowCount</code> this
     * will have no effect.
     *
     * @param row  an integer specifying a display row, where 0 is the
     *             first row in the display
     */
    public void expandRow(int row) {
	expandPath(getPathForRow(row));
    }

    /**
     * Ensures that the node identified by the specified path is 
     * collapsed and viewable.
     * 
     * @param path  the <code>TreePath</code> identifying a node
      */
    public void collapsePath(TreePath path) {
	setExpandedState(path, false);
    }

    /**
     * Ensures that the node in the specified row is collapsed.
     * <p>
     * If <code>row</code> is < 0 or >= <code>getRowCount</code> this
     * will have no effect.
     *
     * @param row  an integer specifying a display row, where 0 is the
     *             first row in the display
      */
    public void collapseRow(int row) {
	collapsePath(getPathForRow(row));
    }

    /**
     * Returns the path for the node at the specified location.
     *
     * @param x an integer giving the number of pixels horizontally from
     *          the left edge of the display area, minus any left margin
     * @param y an integer giving the number of pixels vertically from
     *          the top of the display area, minus any top margin
     * @return  the <code>TreePath</code> for the node at that location
     */
    public TreePath getPathForLocation(int x, int y) {
        TreePath          closestPath = getClosestPathForLocation(x, y);

        if(closestPath != null) {
            Rectangle       pathBounds = getPathBounds(closestPath);

            if(pathBounds != null &&
               x >= pathBounds.x && x < (pathBounds.x + pathBounds.width) &&
               y >= pathBounds.y && y < (pathBounds.y + pathBounds.height))
                return closestPath;
        }
        return null;
    }

    /**
     * Returns the row for the specified location. 
     *
     * @param x an integer giving the number of pixels horizontally from
     *          the left edge of the display area, minus any left margin
     * @param y an integer giving the number of pixels vertically from
     *          the top of the display area, minus any top margin
     * @return the row corresponding to the location, or -1 if the
     *         location is not within the bounds of a displayed cell
     * @see #getClosestRowForLocation
     */
    public int getRowForLocation(int x, int y) {
	return getRowForPath(getPathForLocation(x, y));
    }

    /**
     * Returns the path to the node that is closest to x,y.  If
     * no nodes are currently viewable, or there is no model, returns
     * <code>null</code>, otherwise it always returns a valid path.  To test if
     * the node is exactly at x, y, get the node's bounds and
     * test x, y against that.
     *
     * @param x an integer giving the number of pixels horizontally from
     *          the left edge of the display area, minus any left margin
     * @param y an integer giving the number of pixels vertically from
     *          the top of the display area, minus any top margin
     * @return  the <code>TreePath</code> for the node closest to that location,
     *          <code>null</code> if nothing is viewable or there is no model
     *
     * @see #getPathForLocation
     * @see #getPathBounds
     */
    public TreePath getClosestPathForLocation(int x, int y) {
        TreeUI                  tree = getUI();

        if(tree != null)
            return tree.getClosestPathForLocation(this, x, y);
        return null;
    }

    /**
     * Returns the row to the node that is closest to x,y.  If no nodes
     * are viewable or there is no model, returns -1. Otherwise,
     * it always returns a valid row.  To test if the returned object is 
     * exactly at x, y, get the bounds for the node at the returned
     * row and test x, y against that.
     *
     * @param x an integer giving the number of pixels horizontally from
     *          the left edge of the display area, minus any left margin
     * @param y an integer giving the number of pixels vertically from
     *          the top of the display area, minus any top margin
     * @return the row closest to the location, -1 if nothing is
     *         viewable or there is no model
     *
     * @see #getRowForLocation
     * @see #getRowBounds
     */
    public int getClosestRowForLocation(int x, int y) {
	return getRowForPath(getClosestPathForLocation(x, y));
    }

    /**
     * Returns true if the tree is being edited. The item that is being
     * edited can be obtained using <code>getSelectionPath</code>.
     *
     * @return true if the user is currently editing a node
     * @see #getSelectionPath
     */
    public boolean isEditing() {
        TreeUI                  tree = getUI();

        if(tree != null)
            return tree.isEditing(this);
        return false;
    }

    /**
     * Ends the current editing session.
     * (The <code>DefaultTreeCellEditor</code> 
     * object saves any edits that are currently in progress on a cell.
     * Other implementations may operate differently.) 
     * Has no effect if the tree isn't being edited.
     * <blockquote>
     * <b>Note:</b><br>
     * To make edit-saves automatic whenever the user changes
     * their position in the tree, use {@link #setInvokesStopCellEditing}.
     * </blockquote>
     *
     * @return true if editing was in progress and is now stopped,
     *              false if editing was not in progress
     */
    public boolean stopEditing() {
        TreeUI                  tree = getUI();

        if(tree != null)
            return tree.stopEditing(this);
        return false;
    }

    /**
     * Cancels the current editing session. Has no effect if the
     * tree isn't being edited.
     */
    public void  cancelEditing() {
        TreeUI                  tree = getUI();

        if(tree != null)
	    tree.cancelEditing(this);
    }

    /**
     * Selects the node identified by the specified path and initiates
     * editing.  The edit-attempt fails if the <code>CellEditor</code>
     * does not allow
     * editing for the specified item.
     * 
     * @param path  the <code>TreePath</code> identifying a node
     */
    public void startEditingAtPath(TreePath path) {
        TreeUI                  tree = getUI();

        if(tree != null)
            tree.startEditingAtPath(this, path);
    }

    /**
     * Returns the path to the element that is currently being edited.
     *
     * @return  the <code>TreePath</code> for the node being edited
     */
    public TreePath getEditingPath() {
        TreeUI                  tree = getUI();

        if(tree != null)
            return tree.getEditingPath(this);
        return null;
    }

    //
    // Following are primarily convenience methods for mapping from
    // row based selections to path selections.  Sometimes it is
    // easier to deal with these than paths (mouse downs, key downs
    // usually just deal with index based selections).
    // Since row based selections require a UI many of these won't work
    // without one.
    //

    /**
     * Sets the tree's selection model. When a <code>null</code> value is
     * specified an empty
     * <code>selectionModel</code> is used, which does not allow selections.
     *
     * @param selectionModel the <code>TreeSelectionModel</code> to use,
     *		or <code>null</code> to disable selections
     * @see TreeSelectionModel
     * @beaninfo
     *        bound: true
     *  description: The tree's selection model.
     */
    public void setSelectionModel(TreeSelectionModel selectionModel) {
        if(selectionModel == null)
            selectionModel = EmptySelectionModel.sharedInstance();

        TreeSelectionModel         oldValue = this.selectionModel;

	if (this.selectionModel != null && selectionRedirector != null) {
            this.selectionModel.removeTreeSelectionListener
		                (selectionRedirector);
	}
        if (accessibleContext != null) {
           this.selectionModel.removeTreeSelectionListener((TreeSelectionListener)accessibleContext);
           selectionModel.addTreeSelectionListener((TreeSelectionListener)accessibleContext);
        }

        this.selectionModel = selectionModel;
	if (selectionRedirector != null) {
            this.selectionModel.addTreeSelectionListener(selectionRedirector);
	}
        firePropertyChange(SELECTION_MODEL_PROPERTY, oldValue,
                           this.selectionModel);

        if (accessibleContext != null) {
            accessibleContext.firePropertyChange(
                    AccessibleContext.ACCESSIBLE_SELECTION_PROPERTY,
                    Boolean.valueOf(false), Boolean.valueOf(true));
        }
    }

    /**
     * Returns the model for selections. This should always return a 
     * non-<code>null</code> value. If you don't want to allow anything
     * to be selected
     * set the selection model to <code>null</code>, which forces an empty
     * selection model to be used.
     *
     * @see #setSelectionModel
     */
    public TreeSelectionModel getSelectionModel() {
        return selectionModel;
    }

    /**
     * Returns <code>JTreePath</code> instances representing the path
     * between index0 and index1 (including index1).
     * Returns <code>null</code> if there is no tree.
     *
     * @param index0  an integer specifying a display row, where 0 is the
     *                first row in the display
     * @param index1  an integer specifying a second display row
     * @return an array of <code>TreePath</code> objects, one for each
     *		node between index0 and index1, inclusive; or <code>null</code>
     *		if there is no tree
     */
    protected TreePath[] getPathBetweenRows(int index0, int index1) {
        int              newMinIndex, newMaxIndex;
        TreeUI           tree = getUI();

        newMinIndex = Math.min(index0, index1);
        newMaxIndex = Math.max(index0, index1);

        if(tree != null) {
            TreePath[]            selection = new TreePath[newMaxIndex -
                                                            newMinIndex + 1];

            for(int counter = newMinIndex; counter <= newMaxIndex; counter++)
                selection[counter - newMinIndex] = tree.getPathForRow(this,
								      counter);
            return selection;
        }
        return null;
    }

    /**
     * Selects the nodes between index0 and index1, inclusive.
     *
     * @param index0  an integer specifying a display row, where 0 is the
     *                first row in the display
     * @param index1  an integer specifying a second display row
    */
    public void setSelectionInterval(int index0, int index1) {
        TreePath[]         paths = getPathBetweenRows(index0, index1);

        this.getSelectionModel().setSelectionPaths(paths);
    }

    /**
     * Adds the paths between index0 and index1, inclusive, to the 
     * selection.
     *
     * @param index0  an integer specifying a display row, where 0 is the
     *                first row in the display
     * @param index1  an integer specifying a second display row
     */
    public void addSelectionInterval(int index0, int index1) {
        TreePath[]         paths = getPathBetweenRows(index0, index1);

        this.getSelectionModel().addSelectionPaths(paths);
    }

    /**
     * Removes the nodes between index0 and index1, inclusive, from the 
     * selection.
     *
     * @param index0  an integer specifying a display row, where 0 is the
     *                first row in the display
     * @param index1  an integer specifying a second display row
     */
    public void removeSelectionInterval(int index0, int index1) {
        TreePath[]         paths = getPathBetweenRows(index0, index1);

        this.getSelectionModel().removeSelectionPaths(paths);
    }

    /**
     * Removes the node identified by the specified path from the current
     * selection.
     * 
     * @param path  the <code>TreePath</code> identifying a node
     */
    public void removeSelectionPath(TreePath path) {
        this.getSelectionModel().removeSelectionPath(path);
    }

    /**
     * Removes the nodes identified by the specified paths from the 
     * current selection.
     *
     * @param paths an array of <code>TreePath</code> objects that
     *              specifies the nodes to remove
     */
    public void removeSelectionPaths(TreePath[] paths) {
        this.getSelectionModel().removeSelectionPaths(paths);
    }

    /**
     * Removes the row at the index <code>row</code> from the current
     * selection.
     * 
     * @param row  the row to remove
     */
    public void removeSelectionRow(int row) {
        int[]             rows = { row };

        removeSelectionRows(rows);
    }

    /**
     * Removes the rows that are selected at each of the specified
     * rows.
     *
     * @param rows  an array of ints specifying display rows, where 0 is 
     *             the first row in the display
     */
    public void removeSelectionRows(int[] rows) {
        TreeUI             ui = getUI();

        if(ui != null && rows != null) {
            int                  numRows = rows.length;
            TreePath[]           paths = new TreePath[numRows];

            for(int counter = 0; counter < numRows; counter++)
                paths[counter] = ui.getPathForRow(this, rows[counter]);
            removeSelectionPaths(paths);
        }
    }

    /**
     * Clears the selection.
     */
    public void clearSelection() {
        getSelectionModel().clearSelection();
    }

    /**
     * Returns true if the selection is currently empty.
     *
     * @return true if the selection is currently empty
     */
    public boolean isSelectionEmpty() {
        return getSelectionModel().isSelectionEmpty();
    }

    /**
     * Adds a listener for <code>TreeExpansion</code> events.
     *
     * @param tel a TreeExpansionListener that will be notified when
     *            a tree node is expanded or collapsed (a "negative
     *            expansion")
     */
    public void addTreeExpansionListener(TreeExpansionListener tel) {
	if (settingUI) {
	    uiTreeExpansionListener = tel;
	}
        listenerList.add(TreeExpansionListener.class, tel);
    }

    /**
     * Removes a listener for <code>TreeExpansion</code> events.
     *
     * @param tel the <code>TreeExpansionListener</code> to remove
     */
    public void removeTreeExpansionListener(TreeExpansionListener tel) {
        listenerList.remove(TreeExpansionListener.class, tel);
	if (uiTreeExpansionListener == tel) {
	    uiTreeExpansionListener = null;
	}
    }

    /**
     * Returns an array of all the <code>TreeExpansionListener</code>s added
     * to this JTree with addTreeExpansionListener().
     *
     * @return all of the <code>TreeExpansionListener</code>s added or an empty
     *         array if no listeners have been added
     * @since 1.4
     */
    public TreeExpansionListener[] getTreeExpansionListeners() {
        return (TreeExpansionListener[])listenerList.getListeners(
                TreeExpansionListener.class);
    }

    /**
     * Adds a listener for <code>TreeWillExpand</code> events.
     *
     * @param tel a <code>TreeWillExpandListener</code> that will be notified 
     *            when a tree node will be expanded or collapsed (a "negative
     *            expansion")
     */
    public void addTreeWillExpandListener(TreeWillExpandListener tel) {
        listenerList.add(TreeWillExpandListener.class, tel);
    }

    /**
     * Removes a listener for <code>TreeWillExpand</code> events.
     *
     * @param tel the <code>TreeWillExpandListener</code> to remove
     */
    public void removeTreeWillExpandListener(TreeWillExpandListener tel) {
        listenerList.remove(TreeWillExpandListener.class, tel);
    }

    /**
     * Returns an array of all the <code>TreeWillExpandListener</code>s added
     * to this JTree with addTreeWillExpandListener().
     *
     * @return all of the <code>TreeWillExpandListener</code>s added or an empty
     *         array if no listeners have been added
     * @since 1.4
     */
    public TreeWillExpandListener[] getTreeWillExpandListeners() {
        return (TreeWillExpandListener[])listenerList.getListeners(
                TreeWillExpandListener.class);
    }

    /**
     * Notifies all listeners that have registered interest for
     * notification on this event type.  The event instance 
     * is lazily created using the <code>path</code> parameter.
     *
     * @param path the <code>TreePath</code> indicating the node that was
     *		expanded
     * @see EventListenerList
     */
     public void fireTreeExpanded(TreePath path) {
        // Guaranteed to return a non-null array
        Object[] listeners = listenerList.getListenerList();
        TreeExpansionEvent e = null;
	if (uiTreeExpansionListener != null) {
	    e = new TreeExpansionEvent(this, path);
	    uiTreeExpansionListener.treeExpanded(e);
	}
        // Process the listeners last to first, notifying
        // those that are interested in this event
        for (int i = listeners.length-2; i>=0; i-=2) {
            if (listeners[i]==TreeExpansionListener.class &&
		listeners[i + 1] != uiTreeExpansionListener) {
                // Lazily create the event:
                if (e == null)
                    e = new TreeExpansionEvent(this, path);
                ((TreeExpansionListener)listeners[i+1]).
                    treeExpanded(e);
            }          
        }
    }   

    /**
     * Notifies all listeners that have registered interest for
     * notification on this event type.  The event instance 
     * is lazily created using the <code>path</code> parameter.
     *
     * @param path the <code>TreePath</code> indicating the node that was
     *		collapsed
     * @see EventListenerList
     */
    public void fireTreeCollapsed(TreePath path) {
        // Guaranteed to return a non-null array
        Object[] listeners = listenerList.getListenerList();
        TreeExpansionEvent e = null;
	if (uiTreeExpansionListener != null) {
	    e = new TreeExpansionEvent(this, path);
	    uiTreeExpansionListener.treeCollapsed(e);
	}
        // Process the listeners last to first, notifying
        // those that are interested in this event
        for (int i = listeners.length-2; i>=0; i-=2) {
            if (listeners[i]==TreeExpansionListener.class &&
		listeners[i + 1] != uiTreeExpansionListener) {
                // Lazily create the event:
                if (e == null)
                    e = new TreeExpansionEvent(this, path);
                ((TreeExpansionListener)listeners[i+1]).
                    treeCollapsed(e);
            }          
        }
    }   

    /**
     * Notifies all listeners that have registered interest for
     * notification on this event type.  The event instance 
     * is lazily created using the <code>path</code> parameter.
     *
     * @param path the <code>TreePath</code> indicating the node that was
     *		expanded
     * @see EventListenerList
     */
     public void fireTreeWillExpand(TreePath path) throws ExpandVetoException {
        // Guaranteed to return a non-null array
        Object[] listeners = listenerList.getListenerList();
        TreeExpansionEvent e = null;
        // Process the listeners last to first, notifying
        // those that are interested in this event
        for (int i = listeners.length-2; i>=0; i-=2) {
            if (listeners[i]==TreeWillExpandListener.class) {
                // Lazily create the event:
                if (e == null)
                    e = new TreeExpansionEvent(this, path);
                ((TreeWillExpandListener)listeners[i+1]).
                    treeWillExpand(e);
            }          
        }
    }   

    /**
     * Notifies all listeners that have registered interest for
     * notification on this event type.  The event instance 
     * is lazily created using the <code>path</code> parameter.
     *
     * @param path the <code>TreePath</code> indicating the node that was
     *		expanded
     * @see EventListenerList
     */
     public void fireTreeWillCollapse(TreePath path) throws ExpandVetoException {
        // Guaranteed to return a non-null array
        Object[] listeners = listenerList.getListenerList();
        TreeExpansionEvent e = null;
        // Process the listeners last to first, notifying
        // those that are interested in this event
        for (int i = listeners.length-2; i>=0; i-=2) {
            if (listeners[i]==TreeWillExpandListener.class) {
                // Lazily create the event:
                if (e == null)
                    e = new TreeExpansionEvent(this, path);
                ((TreeWillExpandListener)listeners[i+1]).
                    treeWillCollapse(e);
            }          
        }
    }   

    /**
     * Adds a listener for <code>TreeSelection</code> events.
     *
     * @param tsl the <code>TreeSelectionListener</code> that will be notified 
     *            when a node is selected or deselected (a "negative
     *            selection")
     */
    public void addTreeSelectionListener(TreeSelectionListener tsl) {
        listenerList.add(TreeSelectionListener.class,tsl);
        if(listenerList.getListenerCount(TreeSelectionListener.class) != 0
           && selectionRedirector == null) {
            selectionRedirector = new TreeSelectionRedirector();
            selectionModel.addTreeSelectionListener(selectionRedirector);
        }
    }

    /**
     * Removes a <code>TreeSelection</code> listener.
     *
     * @param tsl the <code>TreeSelectionListener</code> to remove
     */
    public void removeTreeSelectionListener(TreeSelectionListener tsl) {
        listenerList.remove(TreeSelectionListener.class,tsl);
        if(listenerList.getListenerCount(TreeSelectionListener.class) == 0
           && selectionRedirector != null) {
            selectionModel.removeTreeSelectionListener
                (selectionRedirector);
            selectionRedirector = null;
        }
    }

    /**
     * Returns an array of all the <code>TreeSelectionListener</code>s added
     * to this JTree with addTreeSelectionListener().
     *
     * @return all of the <code>TreeSelectionListener</code>s added or an empty
     *         array if no listeners have been added
     * @since 1.4
     */
    public TreeSelectionListener[] getTreeSelectionListeners() {
        return (TreeSelectionListener[])listenerList.getListeners(
                TreeSelectionListener.class);
    }

    /**
     * Notifies all listeners that have registered interest for
     * notification on this event type.  
     *
     * @param e the <code>TreeSelectionEvent</code> to be fired;
     *          generated by the
     *		<code>TreeSelectionModel</code>
     *          when a node is selected or deselected
     * @see EventListenerList
     */
    protected void fireValueChanged(TreeSelectionEvent e) {
        // Guaranteed to return a non-null array
        Object[] listeners = listenerList.getListenerList();
        // Process the listeners last to first, notifying
        // those that are interested in this event
        for (int i = listeners.length-2; i>=0; i-=2) {
            // TreeSelectionEvent e = null;
            if (listeners[i]==TreeSelectionListener.class) {
                // Lazily create the event:
                // if (e == null)
                // e = new ListSelectionEvent(this, firstIndex, lastIndex);
                ((TreeSelectionListener)listeners[i+1]).valueChanged(e);
            }          
        }
    }

    /**
     * Sent when the tree has changed enough that we need to resize
     * the bounds, but not enough that we need to remove the
     * expanded node set (e.g nodes were expanded or collapsed, or
     * nodes were inserted into the tree). You should never have to
     * invoke this, the UI will invoke this as it needs to.
     */
    public void treeDidChange() {
        revalidate();
        repaint();
    }

    /**
     * Sets the number of rows that are to be displayed.
     * This will only work if the tree is contained in a 
     * <code>JScrollPane</code>,
     * and will adjust the preferred size and size of that scrollpane.
     *
     * @param newCount the number of rows to display
     * @beaninfo
     *        bound: true
     *  description: The number of rows that are to be displayed.
     */
    public void setVisibleRowCount(int newCount) {
        int                 oldCount = visibleRowCount;

        visibleRowCount = newCount;
        firePropertyChange(VISIBLE_ROW_COUNT_PROPERTY, oldCount,
                           visibleRowCount);
        invalidate();
        if (accessibleContext != null) {
            ((AccessibleJTree)accessibleContext).fireVisibleDataPropertyChange();
        }
    }

    /**
     * Returns the number of rows that are displayed in the display area.
     *
     * @return the number of rows displayed
     */
    public int getVisibleRowCount() {
        return visibleRowCount;
    }

    /**
     * Expands the root path, assuming the current TreeModel has been set.
     */
    private void expandRoot() {
	TreeModel              model = getModel();

	if(model != null && model.getRoot() != null) {
	    expandPath(new TreePath(model.getRoot()));
	}
    }

    /**
     * Returns the TreePath to the next tree element that 
     * begins with a prefix. To handle the conversion of a
     * <code>TreePath</code> into a String, <code>convertValueToText</code>
     * is used.
     *
     * @param prefix the string to test for a match
     * @param startingRow the row for starting the search
     * @param bias the search direction, either 
     * Position.Bias.Forward or Position.Bias.Backward.
     * @return the TreePath of the next tree element that
     * starts with the prefix; otherwise null
     * @exception IllegalArgumentException if prefix is null
     * or startingRow is out of bounds 
     * @since 1.4
     */
    public TreePath getNextMatch(String prefix, int startingRow,
				 Position.Bias bias) {

        int max = getRowCount();
	if (prefix == null) {
	    throw new IllegalArgumentException();
	}
	if (startingRow < 0 || startingRow >= max) {
	    throw new IllegalArgumentException();
	}
	prefix = prefix.toUpperCase();

	// start search from the next/previous element froom the 
	// selected element
	int increment = (bias == Position.Bias.Forward) ? 1 : -1;
	int row = startingRow;
	do {
	    TreePath path = getPathForRow(row);
	    String text = convertValueToText(
	        path.getLastPathComponent(), isRowSelected(row),
		isExpanded(row), true, row, false);
	    
	    if (text.toUpperCase().startsWith(prefix)) {
		return path;
	    }
	    row = (row + increment + max) % max;
	} while (row != startingRow);
	return null;
    }

    // Serialization support.  
    private void writeObject(ObjectOutputStream s) throws IOException {
        Vector      values = new Vector();

        s.defaultWriteObject();
        // Save the cellRenderer, if its Serializable.
        if(cellRenderer != null && cellRenderer instanceof Serializable) {
            values.addElement("cellRenderer");
            values.addElement(cellRenderer);
        }
        // Save the cellEditor, if its Serializable.
        if(cellEditor != null && cellEditor instanceof Serializable) {
            values.addElement("cellEditor");
            values.addElement(cellEditor);
        }
        // Save the treeModel, if its Serializable.
        if(treeModel != null && treeModel instanceof Serializable) {
            values.addElement("treeModel");
            values.addElement(treeModel);
        }
        // Save the selectionModel, if its Serializable.
        if(selectionModel != null && selectionModel instanceof Serializable) {
            values.addElement("selectionModel");
            values.addElement(selectionModel);
        }

	Object      expandedData = getArchivableExpandedState();

	if(expandedData != null) {
            values.addElement("expandedState");
            values.addElement(expandedData);
	}

        s.writeObject(values);
        if (getUIClassID().equals(uiClassID)) {
            byte count = JComponent.getWriteObjCounter(this);
            JComponent.setWriteObjCounter(this, --count);
            if (count == 0 && ui != null) {
                ui.installUI(this);
            }
        }
    }

    private void readObject(ObjectInputStream s) 
        throws IOException, ClassNotFoundException {
        s.defaultReadObject();

	// Create an instance of expanded state.

	expandedState = new Hashtable();

	expandedStack = new Stack();

        Vector          values = (Vector)s.readObject();
        int             indexCounter = 0;
        int             maxCounter = values.size();

        if(indexCounter < maxCounter && values.elementAt(indexCounter).
           equals("cellRenderer")) {
            cellRenderer = (TreeCellRenderer)values.elementAt(++indexCounter);
            indexCounter++;
        }
        if(indexCounter < maxCounter && values.elementAt(indexCounter).
           equals("cellEditor")) {
            cellEditor = (TreeCellEditor)values.elementAt(++indexCounter);
            indexCounter++;
        }
        if(indexCounter < maxCounter && values.elementAt(indexCounter).
           equals("treeModel")) {
            treeModel = (TreeModel)values.elementAt(++indexCounter);
            indexCounter++;
        }
        if(indexCounter < maxCounter && values.elementAt(indexCounter).
           equals("selectionModel")) {
            selectionModel = (TreeSelectionModel)values.elementAt(++indexCounter);
            indexCounter++;
        }
        if(indexCounter < maxCounter && values.elementAt(indexCounter).
           equals("expandedState")) {
	    unarchiveExpandedState(values.elementAt(++indexCounter));
            indexCounter++;
        }
	// Reinstall the redirector.
        if(listenerList.getListenerCount(TreeSelectionListener.class) != 0) {
            selectionRedirector = new TreeSelectionRedirector();
            selectionModel.addTreeSelectionListener(selectionRedirector);
        }
	// Listener to TreeModel.
	if(treeModel != null) {
	    treeModelListener = createTreeModelListener();
	    if(treeModelListener != null)
		treeModel.addTreeModelListener(treeModelListener);
	}
    }

    /**
     * Returns an object that can be archived indicating what nodes are
     * expanded and what aren't. The objects from the model are NOT
     * written out.
     */
    private Object getArchivableExpandedState() {
	TreeModel       model = getModel();

	if(model != null) {
	    Enumeration        paths = expandedState.keys();

	    if(paths != null) {
		Vector         state = new Vector();

		while(paths.hasMoreElements()) {
		    TreePath   path = (TreePath)paths.nextElement();
		    Object     archivePath;

		    try {
			archivePath = getModelIndexsForPath(path);
		    } catch (Error error) {
			archivePath = null;
		    }
		    if(archivePath != null) {
			state.addElement(archivePath);
			state.addElement(expandedState.get(path));
		    }
		}
		return state;
	    }
	}
	return null;
    }

    /**
     * Updates the expanded state of nodes in the tree based on the 
     * previously archived state <code>state</code>.
     */
    private void unarchiveExpandedState(Object state) {
	if(state instanceof Vector) {
	    Vector          paths = (Vector)state;

	    for(int counter = paths.size() - 1; counter >= 0; counter--) {
		Boolean        eState = (Boolean)paths.elementAt(counter--);
		TreePath       path;

		try {
		    path = getPathForIndexs((int[])paths.elementAt(counter));
		    if(path != null)
			expandedState.put(path, eState);
		} catch (Error error) {}
	    }
	}
    }

    /**
     * Returns an array of integers specifying the indexs of the
     * components in the <code>path</code>. If <code>path</code> is
     * the root, this will return an empty array.  If <code>path</code>
     * is <code>null</code>, <code>null</code> will be returned.
     */
    private int[] getModelIndexsForPath(TreePath path) {
	if(path != null) {
	    TreeModel   model = getModel();
	    int         count = path.getPathCount();
	    int[]       indexs = new int[count - 1];
	    Object      parent = model.getRoot();

	    for(int counter = 1; counter < count; counter++) {
		indexs[counter - 1] = model.getIndexOfChild
			           (parent, path.getPathComponent(counter));
		parent = path.getPathComponent(counter);
		if(indexs[counter - 1] < 0)
		    return null;
	    }
	    return indexs;
	}
	return null;
    }

    /**
     * Returns a <code>TreePath</code> created by obtaining the children
     * for each of the indices in <code>indexs</code>. If <code>indexs</code>
     * or the <code>TreeModel</code> is <code>null</code>, it will return
     * <code>null</code>.
     */
    private TreePath getPathForIndexs(int[] indexs) {
	if(indexs == null)
	    return null;

	TreeModel    model = getModel();

	if(model == null)
	    return null;

	int          count = indexs.length;
	Object       parent = model.getRoot();
	TreePath     parentPath = new TreePath(parent);

	for(int counter = 0; counter < count; counter++) {
	    parent = model.getChild(parent, indexs[counter]);
	    if(parent == null)
		return null;
	    parentPath = parentPath.pathByAddingChild(parent);
	}
	return parentPath;
    }

    /**
     * <code>EmptySelectionModel</code> is a <code>TreeSelectionModel</code>
     * that does not allow anything to be selected.
     * <p>
     * <strong>Warning:</strong>
     * Serialized objects of this class will not be compatible with
     * future Swing releases. The current serialization support is
     * appropriate for short term storage or RMI between applications running
     * the same version of Swing.  As of 1.4, support for long term storage
     * of all JavaBeans<sup><font size="-2">TM</font></sup>
     * has been added to the <code>java.beans</code> package.
     * Please see {@link java.beans.XMLEncoder}.
     */
    protected static class EmptySelectionModel extends
              DefaultTreeSelectionModel
    {
        /** Unique shared instance. */
        protected static final EmptySelectionModel sharedInstance =
            new EmptySelectionModel();

        /** Returns a shared instance of an empty selection model. */
        static public EmptySelectionModel sharedInstance() {
            return sharedInstance;
        }

        /** A <code>null</code> implementation that selects nothing. */
        public void setSelectionPaths(TreePath[] pPaths) {}
        /** A <code>null</code> implementation that adds nothing. */
        public void addSelectionPaths(TreePath[] paths) {}
        /** A <code>null</code> implementation that removes nothing. */
        public void removeSelectionPaths(TreePath[] paths) {}
    }


    /**
     * Handles creating a new <code>TreeSelectionEvent</code> with the 
     * <code>JTree</code> as the
     * source and passing it off to all the listeners.
     * <p>
     * <strong>Warning:</strong>
     * Serialized objects of this class will not be compatible with
     * future Swing releases. The current serialization support is
     * appropriate for short term storage or RMI between applications running
     * the same version of Swing.  As of 1.4, support for long term storage
     * of all JavaBeans<sup><font size="-2">TM</font></sup>
     * has been added to the <code>java.beans</code> package.
     * Please see {@link java.beans.XMLEncoder}.
     */
    protected class TreeSelectionRedirector implements Serializable,
                    TreeSelectionListener
    {
        /**
         * Invoked by the <code>TreeSelectionModel</code> when the
         * selection changes.
         * 
         * @param e the <code>TreeSelectionEvent</code> generated by the
         *		<code>TreeSelectionModel</code>
         */
        public void valueChanged(TreeSelectionEvent e) {
            TreeSelectionEvent       newE;

            newE = (TreeSelectionEvent)e.cloneWithSource(JTree.this);
            fireValueChanged(newE);
        }
    } // End of class JTree.TreeSelectionRedirector

    //
    // Scrollable interface
    //

    /**
     * Returns the preferred display size of a <code>JTree</code>. The height is
     * determined from <code>getVisibleRowCount</code> and the width
     * is the current preferred width.
     *
     * @return a <code>Dimension</code> object containing the preferred size
     */
    public Dimension getPreferredScrollableViewportSize() {
        int                 width = getPreferredSize().width;
        int                 visRows = getVisibleRowCount();
        int                 height = -1;

        if(isFixedRowHeight())
            height = visRows * getRowHeight();
        else {
            TreeUI          ui = getUI();

            if (ui != null && visRows > 0) {
                int rc = ui.getRowCount(this);

                if (rc >= visRows) {
                    Rectangle bounds = getRowBounds(visRows - 1);
                    if (bounds != null) {
                        height = bounds.y + bounds.height;
                    }
                }
                else if (rc > 0) {
                    Rectangle bounds = getRowBounds(0);
                    if (bounds != null) {
                        height = bounds.height * visRows;
                    }
                }
            }
            if (height == -1) {
                height = 16 * visRows;
            }
        }
        return new Dimension(width, height);
    }

    /**
     * Returns the amount to increment when scrolling. The amount is
     * the height of the first displayed row that isn't completely in view
     * or, if it is totally displayed, the height of the next row in the
     * scrolling direction.
     * 
     * @param visibleRect the view area visible within the viewport
     * @param orientation either <code>SwingConstants.VERTICAL</code>
     *		or <code>SwingConstants.HORIZONTAL</code>
     * @param direction less than zero to scroll up/left,
     *		greater than zero for down/right
     * @return the "unit" increment for scrolling in the specified direction
     * @see JScrollBar#setUnitIncrement(int)
     */
    public int getScrollableUnitIncrement(Rectangle visibleRect,
                                          int orientation, int direction) {
        if(orientation == SwingConstants.VERTICAL) {
            Rectangle       rowBounds;
            int             firstIndex = getClosestRowForLocation
                                         (0, visibleRect.y);

            if(firstIndex != -1) {
                rowBounds = getRowBounds(firstIndex);
                if(rowBounds.y != visibleRect.y) {
                    if(direction < 0) {
                        // UP
                        return Math.max(0, (visibleRect.y - rowBounds.y));
                    }
                    return (rowBounds.y + rowBounds.height - visibleRect.y);
                }
                if(direction < 0) { // UP
                    if(firstIndex != 0) {
                        rowBounds = getRowBounds(firstIndex - 1);
                        return rowBounds.height;
                    }
                }
                else {
                    return rowBounds.height;
                }
            }
            return 0;
        }
        return 4;
    }


    /**
     * Returns the amount for a block increment, which is the height or
     * width of <code>visibleRect</code>, based on <code>orientation</code>.
     * 
     * @param visibleRect the view area visible within the viewport
     * @param orientation either <code>SwingConstants.VERTICAL</code>
     *		or <code>SwingConstants.HORIZONTAL</code>
     * @param direction less than zero to scroll up/left,
     *		greater than zero for down/right.
     * @return the "block" increment for scrolling in the specified direction
     * @see JScrollBar#setBlockIncrement(int)
     */
    public int getScrollableBlockIncrement(Rectangle visibleRect,
                                           int orientation, int direction) {
        return (orientation == SwingConstants.VERTICAL) ? visibleRect.height :
            visibleRect.width;
    }
    
    /**
     * Returns false to indicate that the width of the viewport does not 
     * determine the width of the table, unless the preferred width of 
     * the tree is smaller than the viewports width.  In other words: 
     * ensure that the tree is never smaller than its viewport.
     * 
     * @return false
     * @see Scrollable#getScrollableTracksViewportWidth
     */
    public boolean getScrollableTracksViewportWidth() {
	if (getParent() instanceof JViewport) {
	    return (((JViewport)getParent()).getWidth() > getPreferredSize().width);
	}
	return false;
    }

    /**
     * Returns false to indicate that the height of the viewport does not 
     * determine the height of the table, unless the preferred height
     * of the tree is smaller than the viewports height.  In other words: 
     * ensure that the tree is never smaller than its viewport.
     * 
     * @return false
     * @see Scrollable#getScrollableTracksViewportHeight
     */
    public boolean getScrollableTracksViewportHeight() {
	if (getParent() instanceof JViewport) {
	    return (((JViewport)getParent()).getHeight() > getPreferredSize().height);
	}
	return false;
    }

    /**
     * Sets the expanded state of this <code>JTree</code>.
     * If <code>state</code> is
     * true, all parents of <code>path</code> and path are marked as
     * expanded. If <code>state</code> is false, all parents of 
     * <code>path</code> are marked EXPANDED, but <code>path</code> itself
     * is marked collapsed.<p>
     * This will fail if a <code>TreeWillExpandListener</code> vetos it.
     */
    protected void setExpandedState(TreePath path, boolean state) {
	if(path != null) {
	    // Make sure all parents of path are expanded.
	    Stack         stack;
	    TreePath      parentPath = path.getParentPath();

	    if (expandedStack.size() == 0) {
		stack = new Stack();
	    }
	    else {
		stack = (Stack)expandedStack.pop();
	    }

	    try {
		while(parentPath != null) {
		    if(isExpanded(parentPath)) {
			parentPath = null;
		    }
		    else {
			stack.push(parentPath);
			parentPath = parentPath.getParentPath();
		    }
		}
		for(int counter = stack.size() - 1; counter >= 0; counter--) {
		    parentPath = (TreePath)stack.pop();
		    if(!isExpanded(parentPath)) {
			try {
			    fireTreeWillExpand(parentPath);
			} catch (ExpandVetoException eve) {
			    // Expand vetoed!
			    return;
			}
			expandedState.put(parentPath, Boolean.TRUE);
			fireTreeExpanded(parentPath);
			if (accessibleContext != null) {
			    ((AccessibleJTree)accessibleContext).
			                      fireVisibleDataPropertyChange();
			}
		    }
		}
	    }
	    finally {
		if (expandedStack.size() < TEMP_STACK_SIZE) {
		    stack.removeAllElements();
		    expandedStack.push(stack);
		}
	    }
	    if(!state) {
		// collapse last path.
		Object          cValue = expandedState.get(path);

		if(cValue != null && ((Boolean)cValue).booleanValue()) {
		    try {
			fireTreeWillCollapse(path);
		    }
		    catch (ExpandVetoException eve) {
			return;
		    }
		    expandedState.put(path, Boolean.FALSE);
		    fireTreeCollapsed(path);
		    if (removeDescendantSelectedPaths(path, false) &&
			!isPathSelected(path)) {
			// A descendant was selected, select the parent.
			addSelectionPath(path);
		    }
		    if (accessibleContext != null) {
			((AccessibleJTree)accessibleContext).
			            fireVisibleDataPropertyChange();
		    }
		}
	    }
	    else {
		// Expand last path.
		Object          cValue = expandedState.get(path);

		if(cValue == null || !((Boolean)cValue).booleanValue()) {
		    try {
			fireTreeWillExpand(path);
		    }
		    catch (ExpandVetoException eve) {
			return;
		    }
		    expandedState.put(path, Boolean.TRUE);
		    fireTreeExpanded(path);
		    if (accessibleContext != null) {
			((AccessibleJTree)accessibleContext).
			                  fireVisibleDataPropertyChange();
		    }
		}
	    }
	}
    }

    /**
     * Returns an <code>Enumeration</code> of <code>TreePaths</code>
     * that have been expanded that
     * are descendants of <code>parent</code>.
     */
    protected Enumeration<TreePath>
	getDescendantToggledPaths(TreePath parent)
    {
	if(parent == null)
	    return null;

	Vector            descendants = new Vector();
	Enumeration       nodes = expandedState.keys();
	TreePath          path;

	while(nodes.hasMoreElements()) {
	    path = (TreePath)nodes.nextElement();
	    if(parent.isDescendant(path))
		descendants.addElement(path);
	}
	return descendants.elements();
    }
    
    /**
     * Removes any descendants of the <code>TreePaths</code> in
     * <code>toRemove</code>
     * that have been expanded.
     */
     protected void
	 removeDescendantToggledPaths(Enumeration<TreePath> toRemove)
    {
	 if(toRemove != null) {
	     while(toRemove.hasMoreElements()) {
		 Enumeration         descendants = getDescendantToggledPaths
		                         ((TreePath)toRemove.nextElement());

		 if(descendants != null) {
		     while(descendants.hasMoreElements()) {
			 expandedState.remove(descendants.nextElement());
		     }
		 }
	     }
	 }
     }

     /**
      * Clears the cache of toggled tree paths. This does NOT send out
      * any <code>TreeExpansionListener</code> events.
      */
     protected void clearToggledPaths() {
	 expandedState.clear();
     }

     /**
      * Creates and returns an instance of <code>TreeModelHandler</code>.
      * The returned
      * object is responsible for updating the expanded state when the
      * <code>TreeModel</code> changes.
      * <p>
      * For more information on what expanded state means, see the
      * <a href=#jtree_description>JTree description</a> above.
      */
     protected TreeModelListener createTreeModelListener() {
	 return new TreeModelHandler();
     }

    /**
     * Removes any paths in the selection that are descendants of
     * <code>path</code>. If <code>includePath</code> is true and
     * <code>path</code> is selected, it will be removed from the selection.
     *
     * @return true if a descendant was selected
     * @since 1.3
     */
    protected boolean removeDescendantSelectedPaths(TreePath path,
						    boolean includePath) {
	TreePath[]    toRemove = getDescendantSelectedPaths(path, includePath);

	if (toRemove != null) {
	    getSelectionModel().removeSelectionPaths(toRemove);
	    return true;
	}
	return false;
    }

    /**
     * Returns an array of paths in the selection that are descendants of
     * <code>path</code>. The returned array may contain <code>null</code>s.
     */
    private TreePath[] getDescendantSelectedPaths(TreePath path,
						  boolean includePath) {
	TreeSelectionModel   sm = getSelectionModel();
	TreePath[]           selPaths = (sm != null) ? sm.getSelectionPaths() :
	                                null;

	if(selPaths != null) {
	    boolean        shouldRemove = false;

	    for(int counter = selPaths.length - 1; counter >= 0; counter--) {
		if(selPaths[counter] != null &&
		   path.isDescendant(selPaths[counter]) &&
		   (!path.equals(selPaths[counter]) || includePath))
		    shouldRemove = true;
		else
		    selPaths[counter] = null;
	    }
	    if(!shouldRemove) {
		selPaths = null;
	    }
	    return selPaths;
	}
	return null;
    }

    /**
     * Removes any paths from the selection model that are descendants of
     * the nodes identified by in <code>e</code>.
     */
    void removeDescendantSelectedPaths(TreeModelEvent e) {
	TreePath            pPath = e.getTreePath();
	Object[]            oldChildren = e.getChildren();
	TreeSelectionModel  sm = getSelectionModel();

	if (sm != null && pPath != null && oldChildren != null &&
	    oldChildren.length > 0) {
	    for (int counter = oldChildren.length - 1; counter >= 0;
		 counter--) {
		// Might be better to call getDescendantSelectedPaths
		// numerous times, then push to the model.
		removeDescendantSelectedPaths(pPath.pathByAddingChild
					      (oldChildren[counter]), true);
	    }
	}
    }


     /**
      * Listens to the model and updates the <code>expandedState</code>
      * accordingly when nodes are removed, or changed.
      */
    protected class TreeModelHandler implements TreeModelListener {
	public void treeNodesChanged(TreeModelEvent e) { }

	public void treeNodesInserted(TreeModelEvent e) { }

	public void treeStructureChanged(TreeModelEvent e) {
	    if(e == null)
		return;

	    // NOTE: If I change this to NOT remove the descendants
	    // and update BasicTreeUIs treeStructureChanged method
	    // to update descendants in response to a treeStructureChanged
	    // event, all the children of the event won't collapse!
	    TreePath            parent = e.getTreePath();

	    if(parent == null)
		return;

	    if (parent.getPathCount() == 1) {
		// New root, remove everything!
		clearToggledPaths();
		if(treeModel.getRoot() != null &&
                   !treeModel.isLeaf(treeModel.getRoot())) {
		    // Mark the root as expanded, if it isn't a leaf.
		    expandedState.put(parent, Boolean.TRUE);
		}
	    }
	    else if(expandedState.get(parent) != null) {
		Vector<TreePath>    toRemove = new Vector<TreePath>(1);
		boolean             isExpanded = isExpanded(parent);

		toRemove.addElement(parent);
		removeDescendantToggledPaths(toRemove.elements());
		if(isExpanded) {
		    TreeModel         model = getModel();

		    if(model == null || model.isLeaf
		       (parent.getLastPathComponent()))
			collapsePath(parent);
		    else
			expandedState.put(parent, Boolean.TRUE);
		}
	    }
	    removeDescendantSelectedPaths(parent, false);
	}

	public void treeNodesRemoved(TreeModelEvent e) {
	    if(e == null)
		return;

	    TreePath            parent = e.getTreePath();
	    Object[]            children = e.getChildren();

	    if(children == null)
		return;

	    TreePath            rPath;
	    Vector<TreePath>    toRemove
		= new Vector<TreePath>(Math.max(1, children.length));

	    for(int counter = children.length - 1; counter >= 0; counter--) {
		rPath = parent.pathByAddingChild(children[counter]);
		if(expandedState.get(rPath) != null)
		    toRemove.addElement(rPath);
	    }
	    if(toRemove.size() > 0)
		removeDescendantToggledPaths(toRemove.elements());

	    TreeModel         model = getModel();

	    if(model == null || model.isLeaf(parent.getLastPathComponent()))
		expandedState.remove(parent);

	    removeDescendantSelectedPaths(e);
	}
    }


    /**
     * <code>DynamicUtilTreeNode</code> can wrap 
     * vectors/hashtables/arrays/strings and
     * create the appropriate children tree nodes as necessary. It is
     * dynamic in that it will only create the children as necessary.
     * <p>
     * <strong>Warning:</strong>
     * Serialized objects of this class will not be compatible with
     * future Swing releases. The current serialization support is
     * appropriate for short term storage or RMI between applications running
     * the same version of Swing.  As of 1.4, support for long term storage
     * of all JavaBeans<sup><font size="-2">TM</font></sup>
     * has been added to the <code>java.beans</code> package.
     * Please see {@link java.beans.XMLEncoder}.
     */
    public static class DynamicUtilTreeNode extends DefaultMutableTreeNode {
        /**
         * Does the this <code>JTree</code> have children?
         * This property is currently not implemented.
         */
        protected boolean            hasChildren;
        /** Value to create children with. */
        protected Object             childValue;
        /** Have the children been loaded yet? */
        protected boolean            loadedChildren;

        /**
         * Adds to parent all the children in <code>children</code>.
         * If <code>children</code> is an array or vector all of its
         * elements are added is children, otherwise if <code>children</code>
         * is a hashtable all the key/value pairs are added in the order
         * <code>Enumeration</code> returns them.
         */
        public static void createChildren(DefaultMutableTreeNode parent,
                                          Object children) {
            if(children instanceof Vector) {
                Vector          childVector = (Vector)children;

                for(int counter = 0, maxCounter = childVector.size();
                    counter < maxCounter; counter++)
                    parent.add(new DynamicUtilTreeNode
                               (childVector.elementAt(counter),
                                childVector.elementAt(counter)));
            }
            else if(children instanceof Hashtable) {
                Hashtable           childHT = (Hashtable)children;
                Enumeration         keys = childHT.keys();
                Object              aKey;

                while(keys.hasMoreElements()) {
                    aKey = keys.nextElement();
                    parent.add(new DynamicUtilTreeNode(aKey,
                                                       childHT.get(aKey)));
                }
            }
            else if(children instanceof Object[]) {
                Object[]             childArray = (Object[])children;

                for(int counter = 0, maxCounter = childArray.length;
                    counter < maxCounter; counter++)
                    parent.add(new DynamicUtilTreeNode(childArray[counter],
                                                       childArray[counter]));
            }
        }

        /**
         * Creates a node with the specified object as its value and
         * with the specified children. For the node to allow children,
         * the children-object must be an array of objects, a
         * <code>Vector</code>, or a <code>Hashtable</code> -- even
         * if empty. Otherwise, the node is not
         * allowed to have children.
         *
         * @param value  the <code>Object</code> that is the value for the
         *		new node
         * @param children an array of <code>Object</code>s, a
         *		<code>Vector</code>, or a <code>Hashtable</code>
         *		used to create the child nodes; if any other
         *		object is specified, or if the value is
         *		<code>null</code>,
         *		then the node is not allowed to have children
         */
        public DynamicUtilTreeNode(Object value, Object children) {
            super(value);
            loadedChildren = false;
            childValue = children;
            if(children != null) {
                if(children instanceof Vector)
                    setAllowsChildren(true);
                else if(children instanceof Hashtable)
                    setAllowsChildren(true);
                else if(children instanceof Object[])
                    setAllowsChildren(true);
                else
                    setAllowsChildren(false);
            }
            else
                setAllowsChildren(false);
        }

        /**
         * Returns true if this node allows children. Whether the node
         * allows children depends on how it was created.
         *
         * @return true if this node allows children, false otherwise
         * @see #JTree.DynamicUtilTreeNode
         */
        public boolean isLeaf() {
            return !getAllowsChildren();
        }

        /**
         * Returns the number of child nodes.
         *
         * @return the number of child nodes
         */
        public int getChildCount() {
            if(!loadedChildren)
                loadChildren();
            return super.getChildCount();
        }

        /**
         * Loads the children based on <code>childValue</code>.
         * If <code>childValue</code> is a <code>Vector</code>
         * or array each element is added as a child,
         * if <code>childValue</code> is a <code>Hashtable</code>
         * each key/value pair is added in the order that
         * <code>Enumeration</code> returns the keys.
         */
        protected void loadChildren() {
            loadedChildren = true;
            createChildren(this, childValue);
        }

	/**
	 * Subclassed to load the children, if necessary.
	 */
	public TreeNode getChildAt(int index) {
	    if(!loadedChildren)
		loadChildren();
	    return super.getChildAt(index);
	}

	/**
	 * Subclassed to load the children, if necessary.
	 */
	public Enumeration children() {
	    if(!loadedChildren)
		loadChildren();
	    return super.children();
	}
    }

    void setUIProperty(String propertyName, Object value) {
        if (propertyName == "rowHeight") {
	    if (!rowHeightSet) {
		setRowHeight(((Number)value).intValue());
		rowHeightSet = false;
	    }
	} else if (propertyName == "scrollsOnExpand") {
	    if (!scrollsOnExpandSet) {
		setScrollsOnExpand(((Boolean)value).booleanValue());
		scrollsOnExpandSet = false;
	    }
	} else if (propertyName == "showsRootHandles") {
            if (!showsRootHandlesSet) {
                setShowsRootHandles(((Boolean)value).booleanValue());
                showsRootHandlesSet = false;
            }
        } else {
	    super.setUIProperty(propertyName, value);
	}
    }


    /**
     * Returns a string representation of this <code>JTree</code>.
     * This method 
     * is intended to be used only for debugging purposes, and the 
     * content and format of the returned string may vary between      
     * implementations. The returned string may be empty but may not 
     * be <code>null</code>.
     * 
     * @return  a string representation of this <code>JTree</code>.
     */
    protected String paramString() {
        String rootVisibleString = (rootVisible ?
                                    "true" : "false");
        String showsRootHandlesString = (showsRootHandles ?
					 "true" : "false");
        String editableString = (editable ?
				 "true" : "false");
        String largeModelString = (largeModel ?
				   "true" : "false");
        String invokesStopCellEditingString = (invokesStopCellEditing ?
					       "true" : "false");
        String scrollsOnExpandString = (scrollsOnExpand ?
					"true" : "false");

        return super.paramString() +
        ",editable=" + editableString +
        ",invokesStopCellEditing=" + invokesStopCellEditingString +
        ",largeModel=" + largeModelString +
        ",rootVisible=" + rootVisibleString +
        ",rowHeight=" + rowHeight +
        ",scrollsOnExpand=" + scrollsOnExpandString +
        ",showsRootHandles=" + showsRootHandlesString +
        ",toggleClickCount=" + toggleClickCount +
        ",visibleRowCount=" + visibleRowCount;
    }

/////////////////
// Accessibility support
////////////////

    /**
     * Gets the AccessibleContext associated with this JTree. 
     * For JTrees, the AccessibleContext takes the form of an 
     * AccessibleJTree. 
     * A new AccessibleJTree instance is created if necessary.
     *
     * @return an AccessibleJTree that serves as the 
     *         AccessibleContext of this JTree
     */
    public AccessibleContext getAccessibleContext() {
        if (accessibleContext == null) {
            accessibleContext = new AccessibleJTree();
        }
        return accessibleContext;
    }

    /**
     * This class implements accessibility support for the 
     * <code>JTree</code> class.  It provides an implementation of the 
     * Java Accessibility API appropriate to tree user-interface elements.
     * <p>
     * <strong>Warning:</strong>
     * Serialized objects of this class will not be compatible with
     * future Swing releases. The current serialization support is
     * appropriate for short term storage or RMI between applications running
     * the same version of Swing.  As of 1.4, support for long term storage
     * of all JavaBeans<sup><font size="-2">TM</font></sup>
     * has been added to the <code>java.beans</code> package.
     * Please see {@link java.beans.XMLEncoder}.
     */
    protected class AccessibleJTree extends AccessibleJComponent 
            implements AccessibleSelection, TreeSelectionListener, 
	               TreeModelListener, TreeExpansionListener  {

        TreePath   leadSelectionPath;
	Accessible leadSelectionAccessible;

        public AccessibleJTree() {
            // Add a tree model listener for JTree
            TreeModel model = JTree.this.getModel();
            if (model != null) {
                model.addTreeModelListener(this);
            }
	    JTree.this.addTreeExpansionListener(this);      
	    JTree.this.addTreeSelectionListener(this);      
            leadSelectionPath = JTree.this.getLeadSelectionPath();
	    leadSelectionAccessible = (leadSelectionPath != null) 
		    ? new AccessibleJTreeNode(JTree.this,
		                              leadSelectionPath,
		                              JTree.this)
		    : null;
        }
 
        /**
         * Tree Selection Listener value change method. Used to fire the 
	 * property change
         *
         * @param e ListSelectionEvent
         *
         */
        public void valueChanged(TreeSelectionEvent e) {
            // Fixes 4546503 - JTree is sending incorrect active 
            // descendant events
            TreePath oldLeadSelectionPath = e.getOldLeadSelectionPath();
            leadSelectionPath = e.getNewLeadSelectionPath();

	    if (oldLeadSelectionPath != leadSelectionPath) {
		// Set parent to null so AccessibleJTreeNode computes 
		// its parent.
		Accessible oldLSA = leadSelectionAccessible;
		leadSelectionAccessible = (leadSelectionPath != null) 
			? new AccessibleJTreeNode(JTree.this,
						  leadSelectionPath,
		                  		  null) // parent
			: null;
                firePropertyChange(AccessibleContext.ACCESSIBLE_ACTIVE_DESCENDANT_PROPERTY,
                                   oldLSA, leadSelectionAccessible);
	    }
            firePropertyChange(AccessibleContext.ACCESSIBLE_SELECTION_PROPERTY,
                               Boolean.valueOf(false), Boolean.valueOf(true));
	}

        /**
         * Fire a visible data property change notification.
         * A 'visible' data property is one that represents
         * something about the way the component appears on the
         * display, where that appearance isn't bound to any other
         * property. It notifies screen readers  that the visual 
         * appearance of the component has changed, so they can 
         * notify the user.
         */
        public void fireVisibleDataPropertyChange() {
           firePropertyChange(AccessibleContext.ACCESSIBLE_VISIBLE_DATA_PROPERTY,
                              Boolean.valueOf(false), Boolean.valueOf(true));
        }
 
        // Fire the visible data changes for the model changes.
 
        /**
         * Tree Model Node change notification.
         *
         * @param e  a Tree Model event
         */
        public void treeNodesChanged(TreeModelEvent e) {
           fireVisibleDataPropertyChange();
        }
 
        /**
         * Tree Model Node change notification.
         *
         * @param e  a Tree node insertion event
         */
        public void treeNodesInserted(TreeModelEvent e) {
           fireVisibleDataPropertyChange();
        }
 
        /**
         * Tree Model Node change notification.
         *
         * @param e  a Tree node(s) removal event
         */
        public  void treeNodesRemoved(TreeModelEvent e) {
           fireVisibleDataPropertyChange();
        }
 
        /**
         * Tree Model structure change change notification.
         *
         * @param e  a Tree Model event
         */
        public  void treeStructureChanged(TreeModelEvent e) {
           fireVisibleDataPropertyChange();
        }
 
        /**
         * Tree Collapsed notification.
         *
         * @param e  a TreeExpansionEvent
         */
        public  void treeCollapsed(TreeExpansionEvent e) {
	    fireVisibleDataPropertyChange();
	    TreePath path = e.getPath();
	    if (path != null) {
		// Set parent to null so AccessibleJTreeNode computes 
		// its parent.
		AccessibleJTreeNode node = new AccessibleJTreeNode(JTree.this,
								   path,
								   null);
		PropertyChangeEvent pce = new PropertyChangeEvent(node,
		    AccessibleContext.ACCESSIBLE_STATE_PROPERTY,
                    AccessibleState.EXPANDED,
		    AccessibleState.COLLAPSED);
		firePropertyChange(AccessibleContext.ACCESSIBLE_STATE_PROPERTY,
				   null, pce);
	    }
        }
 
        /**
         * Tree Model Expansion notification.
         *
         * @param e  a Tree node insertion event
         */
        public  void treeExpanded(TreeExpansionEvent e) {
            fireVisibleDataPropertyChange();
	    TreePath path = e.getPath();
	    if (path != null) {
                // TIGER - 4839971 
		// Set parent to null so AccessibleJTreeNode computes 
		// its parent.
		AccessibleJTreeNode node = new AccessibleJTreeNode(JTree.this,
								   path,
								   null);
		PropertyChangeEvent pce = new PropertyChangeEvent(node,
		    AccessibleContext.ACCESSIBLE_STATE_PROPERTY,
		    AccessibleState.COLLAPSED,
                    AccessibleState.EXPANDED);
		firePropertyChange(AccessibleContext.ACCESSIBLE_STATE_PROPERTY,
				   null, pce);
            }
        }

 
        private AccessibleContext getCurrentAccessibleContext() {
            Component c = getCurrentComponent();
            if (c instanceof Accessible) {
                return (((Accessible) c).getAccessibleContext());
            } else {
                return null;
            }
        }
 
        private Component getCurrentComponent() {
            // is the object visible?
            // if so, get row, selected, focus & leaf state, 
            // and then get the renderer component and return it
            TreeModel model = JTree.this.getModel();
            if (model == null) {
                return null;
            }
            TreePath path = new TreePath(model.getRoot());
            if (JTree.this.isVisible(path)) {
                TreeCellRenderer r = JTree.this.getCellRenderer();
                TreeUI ui = JTree.this.getUI();
                if (ui != null) {
                    int row = ui.getRowForPath(JTree.this, path);
		    int lsr = JTree.this.getLeadSelectionRow();
                    boolean hasFocus = JTree.this.isFocusOwner()
				       && (lsr == row);
                    boolean selected = JTree.this.isPathSelected(path);
                    boolean expanded = JTree.this.isExpanded(path);

                    return r.getTreeCellRendererComponent(JTree.this, 
                        model.getRoot(), selected, expanded, 
                        model.isLeaf(model.getRoot()), row, hasFocus);
                }
            } 
            return null;
        }

        // Overridden methods from AccessibleJComponent

        /**
         * Get the role of this object.
         *
         * @return an instance of AccessibleRole describing the role of the 
         * object
         * @see AccessibleRole
         */
        public AccessibleRole getAccessibleRole() {
            return AccessibleRole.TREE;
        }

        /**
         * Returns the <code>Accessible</code> child, if one exists,
         * contained at the local coordinate <code>Point</code>.
         * Otherwise returns <code>null</code>.
         *
         * @param p point in local coordinates of this <code>Accessible</code>
         * @return the <code>Accessible</code>, if it exists,
         *    at the specified location; else <code>null</code>
         */
        public Accessible getAccessibleAt(Point p) {
            TreePath path = getClosestPathForLocation(p.x, p.y);
            if (path != null) {
		// JTree.this is NOT the parent; parent will get computed later
                return new AccessibleJTreeNode(JTree.this, path, null);
            } else {
                return null;
            }
        }

        /**
         * Returns the number of top-level children nodes of this 
         * JTree.  Each of these nodes may in turn have children nodes.
         *
         * @return the number of accessible children nodes in the tree.
         */
        public int getAccessibleChildrenCount() {
            TreeModel model = JTree.this.getModel();
            if (model == null) {
                return 0;
            }
            if (isRootVisible()) {
                return 1;    // the root node
            }

            // return the root's first set of children count
            return model.getChildCount(model.getRoot());
        }

        /**
         * Return the nth Accessible child of the object.
         *
         * @param i zero-based index of child
         * @return the nth Accessible child of the object
         */
        public Accessible getAccessibleChild(int i) {
            TreeModel model = JTree.this.getModel();
            if (model == null) {
                return null;
            }
            if (isRootVisible()) {
                if (i == 0) {    // return the root node Accessible
                    Object[] objPath = { model.getRoot() };
                    TreePath path = new TreePath(objPath);
                    return new AccessibleJTreeNode(JTree.this, path, JTree.this);
                } else {
                    return null;
                }
            }

            // return Accessible for one of root's child nodes
            int count = model.getChildCount(model.getRoot());
            if (i < 0 || i >= count) {        
                return null;
            }
            Object obj = model.getChild(model.getRoot(), i);
            Object[] objPath = { model.getRoot(), obj }; 
            TreePath path = new TreePath(objPath);
            return new AccessibleJTreeNode(JTree.this, path, JTree.this);
        }

        /**
         * Get the index of this object in its accessible parent. 
         *
         * @return the index of this object in its parent.  Since a JTree
         * top-level object does not have an accessible parent.
         * @see #getAccessibleParent
         */
        public int getAccessibleIndexInParent() {
	    // didn't ever need to override this...
            return super.getAccessibleIndexInParent();
	}

        // AccessibleSelection methods
	/**
         * Get the AccessibleSelection associated with this object.  In the
         * implementation of the Java Accessibility API for this class, 
	 * return this object, which is responsible for implementing the
         * AccessibleSelection interface on behalf of itself.
	 * 
	 * @return this object
	 */
        public AccessibleSelection getAccessibleSelection() {
            return this;
        }

        /**
         * Returns the number of items currently selected.
         * If no items are selected, the return value will be 0.
         *
         * @return the number of items currently selected.
         */
        public int getAccessibleSelectionCount() {
            Object[] rootPath = new Object[1];
            rootPath[0] = treeModel.getRoot();
            TreePath childPath = new TreePath(rootPath);
            if (JTree.this.isPathSelected(childPath)) {
                return 1;
            } else {
                return 0;
            }
        }

        /**
         * Returns an Accessible representing the specified selected item
         * in the object.  If there isn't a selection, or there are 
         * fewer items selected than the integer passed in, the return
         * value will be null.
         *
         * @param i the zero-based index of selected items
         * @return an Accessible containing the selected item
         */
        public Accessible getAccessibleSelection(int i) {
	    // The JTree can have only one accessible child, the root.
            if (i == 0) {
                Object[] rootPath = new Object[1];
                rootPath[0] = treeModel.getRoot();
                TreePath childPath = new TreePath(rootPath);
                if (JTree.this.isPathSelected(childPath)) {
                    return new AccessibleJTreeNode(JTree.this, childPath, JTree.this);
                }
            }
            return null;
        }

        /**
         * Returns true if the current child of this object is selected.
         *
         * @param i the zero-based index of the child in this Accessible object.
         * @see AccessibleContext#getAccessibleChild
         */
        public boolean isAccessibleChildSelected(int i) {
	    // The JTree can have only one accessible child, the root.
	    if (i == 0) {
                Object[] rootPath = new Object[1];
                rootPath[0] = treeModel.getRoot();
                TreePath childPath = new TreePath(rootPath);
                return JTree.this.isPathSelected(childPath);
	    } else {
		return false;
	    }
        }

        /**
         * Adds the specified selected item in the object to the object's
         * selection.  If the object supports multiple selections,
         * the specified item is added to any existing selection, otherwise
         * it replaces any existing selection in the object.  If the
         * specified item is already selected, this method has no effect.
         *
         * @param i the zero-based index of selectable items
         */
        public void addAccessibleSelection(int i) {
           TreeModel model = JTree.this.getModel();
           if (model != null) {
               if (i == 0) {
                   Object[] objPath = {model.getRoot()};
                   TreePath path = new TreePath(objPath);
                   JTree.this.addSelectionPath(path);
                }
            }
        }

        /**
         * Removes the specified selected item in the object from the object's
         * selection.  If the specified item isn't currently selected, this
         * method has no effect.
         *
         * @param i the zero-based index of selectable items
         */
        public void removeAccessibleSelection(int i) {
	    TreeModel model = JTree.this.getModel();
	    if (model != null) {
                if (i == 0) {
                    Object[] objPath = {model.getRoot()};
                    TreePath path = new TreePath(objPath);
                    JTree.this.removeSelectionPath(path);
                }
            }
        }

        /**
         * Clears the selection in the object, so that nothing in the
         * object is selected.
         */
        public void clearAccessibleSelection() {
            int childCount = getAccessibleChildrenCount();
            for (int i = 0; i < childCount; i++) {
                removeAccessibleSelection(i);
            }
        }

        /**
         * Causes every selected item in the object to be selected
         * if the object supports multiple selections.
         */
        public void selectAllAccessibleSelection() {
            TreeModel model = JTree.this.getModel();
            if (model != null) {
                Object[] objPath = {model.getRoot()};
                TreePath path = new TreePath(objPath);
                JTree.this.addSelectionPath(path);
            }
        }

        /**
         * This class implements accessibility support for the 
         * <code>JTree</code> child.  It provides an implementation of the 
         * Java Accessibility API appropriate to tree nodes.
         */
        protected class AccessibleJTreeNode extends AccessibleContext
            implements Accessible, AccessibleComponent, AccessibleSelection, 
            AccessibleAction {

            private JTree tree = null;
            private TreeModel treeModel = null;
            private Object obj = null;
            private TreePath path = null;
            private Accessible accessibleParent = null;
            private int index = 0;
            private boolean isLeaf = false;

            /**
             *  Constructs an AccessibleJTreeNode
	     * @since 1.4
             */
            public AccessibleJTreeNode(JTree t, TreePath p, Accessible ap) {
                tree = t;
                path = p;
                accessibleParent = ap;
                treeModel = t.getModel();
                obj = p.getLastPathComponent();
                if (treeModel != null) {
                    isLeaf = treeModel.isLeaf(obj);
                }
            }

            private TreePath getChildTreePath(int i) {
                // Tree nodes can't be so complex that they have
                // two sets of children -> we're ignoring that case
                if (i < 0 || i >= getAccessibleChildrenCount()) {
                    return null;
                } else {
                    Object childObj = treeModel.getChild(obj, i);
                    Object[] objPath = path.getPath();
                    Object[] objChildPath = new Object[objPath.length+1];
                    java.lang.System.arraycopy(objPath, 0, objChildPath, 0, objPath.length);
                    objChildPath[objChildPath.length-1] = childObj;
                    return new TreePath(objChildPath);
                }
            }

            /**
             * Get the AccessibleContext associated with this tree node. 
             * In the implementation of the Java Accessibility API for 
	     * this class, return this object, which is its own 
	     * AccessibleContext.
             *
             * @return this object
             */
            public AccessibleContext getAccessibleContext() {
                return this;
            }

            private AccessibleContext getCurrentAccessibleContext() {
                Component c = getCurrentComponent();
                if (c instanceof Accessible) {
                    return (((Accessible) c).getAccessibleContext());
                } else {
                    return null;
                }
            }

            private Component getCurrentComponent() {
                // is the object visible?
                // if so, get row, selected, focus & leaf state, 
                // and then get the renderer component and return it
                if (tree.isVisible(path)) {
                    TreeCellRenderer r = tree.getCellRenderer();
		    if (r == null) {
			return null;
		    }
                    TreeUI ui = tree.getUI();
                    if (ui != null) {
                        int row = ui.getRowForPath(JTree.this, path);
                        boolean selected = tree.isPathSelected(path);
                        boolean expanded = tree.isExpanded(path);
                        boolean hasFocus = false; // how to tell?? -PK
                        return r.getTreeCellRendererComponent(tree, obj, 
                            selected, expanded, isLeaf, row, hasFocus);
                    }
                } 
                return null;
            }

        // AccessibleContext methods
    
             /**
              * Get the accessible name of this object.
              *
              * @return the localized name of the object; null if this 
              * object does not have a name
              */
             public String getAccessibleName() {
                AccessibleContext ac = getCurrentAccessibleContext();
                if (ac != null) {
                    String name = ac.getAccessibleName();
                    if ((name != null) && (name != "")) {
                        return ac.getAccessibleName();
                    } else {
                        return null;
                    }
                }
                if ((accessibleName != null) && (accessibleName != "")) {
                    return accessibleName;
                } else {
                    // fall back to the client property
                    return (String)getClientProperty(AccessibleContext.ACCESSIBLE_NAME_PROPERTY);
                }
            }
    
            /**
             * Set the localized accessible name of this object.
             *
             * @param s the new localized name of the object.
             */
            public void setAccessibleName(String s) {
                AccessibleContext ac = getCurrentAccessibleContext();
                if (ac != null) {
                    ac.setAccessibleName(s);
                } else {
                    super.setAccessibleName(s);
                }
            }
    
            //
            // *** should check tooltip text for desc. (needs MouseEvent)
            //
            /**
             * Get the accessible description of this object.
             *
             * @return the localized description of the object; null if 
             * this object does not have a description
             */
            public String getAccessibleDescription() {
                AccessibleContext ac = getCurrentAccessibleContext();
                if (ac != null) {
                    return ac.getAccessibleDescription();
                } else {
                    return super.getAccessibleDescription();
                }
            }
    
            /**
             * Set the accessible description of this object.
             *
             * @param s the new localized description of the object
             */
            public void setAccessibleDescription(String s) {
                AccessibleContext ac = getCurrentAccessibleContext();
                if (ac != null) {
                    ac.setAccessibleDescription(s);
                } else {
                    super.setAccessibleDescription(s);
                }
            }
    
            /**
             * Get the role of this object.
             *
             * @return an instance of AccessibleRole describing the role of the object
             * @see AccessibleRole
             */
            public AccessibleRole getAccessibleRole() {
                AccessibleContext ac = getCurrentAccessibleContext();
                if (ac != null) {
                    return ac.getAccessibleRole();
                } else {
                    return AccessibleRole.UNKNOWN;
                }
            }
    
            /**
             * Get the state set of this object.
             *
             * @return an instance of AccessibleStateSet containing the 
             * current state set of the object
             * @see AccessibleState
             */
            public AccessibleStateSet getAccessibleStateSet() {
                AccessibleContext ac = getCurrentAccessibleContext();
                AccessibleStateSet states;
                if (ac != null) {
                    states = ac.getAccessibleStateSet();
                } else {
                    states = new AccessibleStateSet();
                }
                // need to test here, 'cause the underlying component 
                // is a cellRenderer, which is never showing...
                if (isShowing()) {
                    states.add(AccessibleState.SHOWING);
                } else if (states.contains(AccessibleState.SHOWING)) {
                    states.remove(AccessibleState.SHOWING);
                }
                if (isVisible()) {
                    states.add(AccessibleState.VISIBLE);
                } else if (states.contains(AccessibleState.VISIBLE)) {
                    states.remove(AccessibleState.VISIBLE);
                }
                if (tree.isPathSelected(path)){
                    states.add(AccessibleState.SELECTED);
                }
		if (path == getLeadSelectionPath()) {
                    states.add(AccessibleState.ACTIVE);
                }
                if (!isLeaf) {
                    states.add(AccessibleState.EXPANDABLE);
                }
                if (tree.isExpanded(path)) {
                    states.add(AccessibleState.EXPANDED);
                } else {
                    states.add(AccessibleState.COLLAPSED);
                }
                if (tree.isEditable()) {
                    states.add(AccessibleState.EDITABLE);
                }
                return states;
            }
    
            /**
             * Get the Accessible parent of this object.
             *
             * @return the Accessible parent of this object; null if this
             * object does not have an Accessible parent
             */
            public Accessible getAccessibleParent() {
		// someone wants to know, so we need to create our parent
		// if we don't have one (hey, we're a talented kid!)
		if (accessibleParent == null) {
		    Object[] objPath = path.getPath();
		    if (objPath.length > 1) {
			Object objParent = objPath[objPath.length-2];
			if (treeModel != null) {
			    index = treeModel.getIndexOfChild(objParent, obj);
			}
			Object[] objParentPath = new Object[objPath.length-1];
			java.lang.System.arraycopy(objPath, 0, objParentPath,
						   0, objPath.length-1);
			TreePath parentPath = new TreePath(objParentPath);
			accessibleParent = new AccessibleJTreeNode(tree, 
								   parentPath, 
								   null);
			this.setAccessibleParent(accessibleParent);
		    } else if (treeModel != null) {
			accessibleParent = tree; // we're the top!
			index = 0; // we're an only child!
			this.setAccessibleParent(accessibleParent);
		    }
		}
                return accessibleParent;
            }
    
            /**
             * Get the index of this object in its accessible parent. 
             *
             * @return the index of this object in its parent; -1 if this 
             * object does not have an accessible parent.
             * @see #getAccessibleParent
             */
            public int getAccessibleIndexInParent() {
		// index is invalid 'till we have an accessibleParent...
		if (accessibleParent == null) {
		    getAccessibleParent();
		}
		Object[] objPath = path.getPath();
		if (objPath.length > 1) {
		    Object objParent = objPath[objPath.length-2];
		    if (treeModel != null) {
			index = treeModel.getIndexOfChild(objParent, obj);
		    }
		}
                return index;
            }
    
            /**
             * Returns the number of accessible children in the object.
             *
             * @return the number of accessible children in the object.
             */
            public int getAccessibleChildrenCount() {
                // Tree nodes can't be so complex that they have 
                // two sets of children -> we're ignoring that case
                return treeModel.getChildCount(obj);
            }
    
            /**
             * Return the specified Accessible child of the object.
             *
             * @param i zero-based index of child
             * @return the Accessible child of the object
             */
            public Accessible getAccessibleChild(int i) {
                // Tree nodes can't be so complex that they have 
                // two sets of children -> we're ignoring that case
                if (i < 0 || i >= getAccessibleChildrenCount()) {
                    return null;
                } else {
                    Object childObj = treeModel.getChild(obj, i);
                    Object[] objPath = path.getPath();
                    Object[] objChildPath = new Object[objPath.length+1];
                    java.lang.System.arraycopy(objPath, 0, objChildPath, 0, objPath.length);
                    objChildPath[objChildPath.length-1] = childObj;
                    TreePath childPath = new TreePath(objChildPath);
                    return new AccessibleJTreeNode(JTree.this, childPath, this);
                }
            }
    
            /** 
             * Gets the locale of the component. If the component does not have
             * a locale, then the locale of its parent is returned.  
             *
             * @return This component's locale. If this component does not have 
	     * a locale, the locale of its parent is returned.
             * @exception IllegalComponentStateException 
             * If the Component does not have its own locale and has not yet 
	     * been added to a containment hierarchy such that the locale can be
             * determined from the containing parent. 
             * @see #setLocale
             */
            public Locale getLocale() {
                AccessibleContext ac = getCurrentAccessibleContext();
                if (ac != null) {
                    return ac.getLocale();
                } else {
                    return tree.getLocale();
                }
            }
    
            /**
             * Add a PropertyChangeListener to the listener list.
             * The listener is registered for all properties.
             *
             * @param l  The PropertyChangeListener to be added
             */
            public void addPropertyChangeListener(PropertyChangeListener l) {
                AccessibleContext ac = getCurrentAccessibleContext();
                if (ac != null) {
                    ac.addPropertyChangeListener(l);
                } else {
                    super.addPropertyChangeListener(l);
                }
            }
    
            /**
             * Remove a PropertyChangeListener from the listener list.
             * This removes a PropertyChangeListener that was registered
             * for all properties.
             *
             * @param l  The PropertyChangeListener to be removed
             */
            public void removePropertyChangeListener(PropertyChangeListener l) {
                AccessibleContext ac = getCurrentAccessibleContext();
                if (ac != null) {
                    ac.removePropertyChangeListener(l);
                } else {
                    super.removePropertyChangeListener(l);
                }
            }
    
            /**
             * Get the AccessibleAction associated with this object.  In the
             * implementation of the Java Accessibility API for this class, 
             * return this object, which is responsible for implementing the
             * AccessibleAction interface on behalf of itself.
	     * 
	     * @return this object
             */
            public AccessibleAction getAccessibleAction() {
                return this;
            }

            /**
             * Get the AccessibleComponent associated with this object.  In the
             * implementation of the Java Accessibility API for this class, 
             * return this object, which is responsible for implementing the
             * AccessibleComponent interface on behalf of itself.
             * 
             * @return this object
             */
            public AccessibleComponent getAccessibleComponent() {
                return this; // to override getBounds()
            }

            /**
             * Get the AccessibleSelection associated with this object if one
             * exists.  Otherwise return null.
             *
             * @return the AccessibleSelection, or null
             */
            public AccessibleSelection getAccessibleSelection() {
                AccessibleContext ac = getCurrentAccessibleContext();
                if (ac != null && isLeaf) {
                    return getCurrentAccessibleContext().getAccessibleSelection();
                } else {
                    return this;
                }
            }

            /**
             * Get the AccessibleText associated with this object if one
             * exists.  Otherwise return null.
             *
             * @return the AccessibleText, or null
             */
            public AccessibleText getAccessibleText() {
                AccessibleContext ac = getCurrentAccessibleContext();
                if (ac != null) {
                    return getCurrentAccessibleContext().getAccessibleText();
                } else {
                    return null;
                }
            }

            /**
             * Get the AccessibleValue associated with this object if one
             * exists.  Otherwise return null.
             *
             * @return the AccessibleValue, or null
             */
            public AccessibleValue getAccessibleValue() {
                AccessibleContext ac = getCurrentAccessibleContext();
                if (ac != null) {
                    return getCurrentAccessibleContext().getAccessibleValue();
                } else {
                    return null;
                }
            }


        // AccessibleComponent methods
    
            /**
             * Get the background color of this object.
             *
             * @return the background color, if supported, of the object; 
             * otherwise, null
             */
            public Color getBackground() {
                AccessibleContext ac = getCurrentAccessibleContext();
                if (ac instanceof AccessibleComponent) {
                    return ((AccessibleComponent) ac).getBackground();
                } else {
                    Component c = getCurrentComponent();
                    if (c != null) {
                        return c.getBackground();
                    } else {
                        return null;
                    }
                }
            }
    
            /**
             * Set the background color of this object.
             *
             * @param c the new Color for the background
             */
            public void setBackground(Color c) {
                AccessibleContext ac = getCurrentAccessibleContext();
                if (ac instanceof AccessibleComponent) {
                    ((AccessibleComponent) ac).setBackground(c);
                } else {
                    Component cp = getCurrentComponent();
                    if (cp != null) {
                        cp.setBackground(c);
                    }
                }
            }
    
        
            /**
             * Get the foreground color of this object.
             *
             * @return the foreground color, if supported, of the object; 
             * otherwise, null
             */
            public Color getForeground() {
                AccessibleContext ac = getCurrentAccessibleContext();
                if (ac instanceof AccessibleComponent) {
                    return ((AccessibleComponent) ac).getForeground();
                } else {
                    Component c = getCurrentComponent();
                    if (c != null) {
                        return c.getForeground();
                    } else {
                        return null;
                    }
                }
            }
    
            public void setForeground(Color c) {
                AccessibleContext ac = getCurrentAccessibleContext();
                if (ac instanceof AccessibleComponent) {
                    ((AccessibleComponent) ac).setForeground(c);
                } else {
                    Component cp = getCurrentComponent();
                    if (cp != null) {
                        cp.setForeground(c);
                    }
                }
            }
    
            public Cursor getCursor() {
                AccessibleContext ac = getCurrentAccessibleContext();
                if (ac instanceof AccessibleComponent) {
                    return ((AccessibleComponent) ac).getCursor();
                } else {
                    Component c = getCurrentComponent();
                    if (c != null) {
                        return c.getCursor();
                    } else {
                        Accessible ap = getAccessibleParent();
                        if (ap instanceof AccessibleComponent) {
                            return ((AccessibleComponent) ap).getCursor();
                        } else {
                            return null;
                        }
                    }
                }
            }
    
            public void setCursor(Cursor c) {
                AccessibleContext ac = getCurrentAccessibleContext();
                if (ac instanceof AccessibleComponent) {
                    ((AccessibleComponent) ac).setCursor(c);
                } else {
                    Component cp = getCurrentComponent();
                    if (cp != null) {
                        cp.setCursor(c);
                    }
                }
            }
    
            public Font getFont() {
                AccessibleContext ac = getCurrentAccessibleContext();
                if (ac instanceof AccessibleComponent) {
                    return ((AccessibleComponent) ac).getFont();
                } else {
                    Component c = getCurrentComponent();
                    if (c != null) {
                        return c.getFont();
                    } else {
                        return null;
                    }
                }
            }
    
            public void setFont(Font f) {
                AccessibleContext ac = getCurrentAccessibleContext();
                if (ac instanceof AccessibleComponent) {
                    ((AccessibleComponent) ac).setFont(f);
                } else {
                    Component c = getCurrentComponent();
                    if (c != null) {
                        c.setFont(f);
                    }
                }
            }
    
            public FontMetrics getFontMetrics(Font f) {
                AccessibleContext ac = getCurrentAccessibleContext();
                if (ac instanceof AccessibleComponent) {
                    return ((AccessibleComponent) ac).getFontMetrics(f);
                } else {
                    Component c = getCurrentComponent();
                    if (c != null) {
                        return c.getFontMetrics(f);
                    } else {
                        return null;
                    }
                }
            }
    
            public boolean isEnabled() {
                AccessibleContext ac = getCurrentAccessibleContext();
                if (ac instanceof AccessibleComponent) {
                    return ((AccessibleComponent) ac).isEnabled();
                } else {
                    Component c = getCurrentComponent();
                    if (c != null) {
                        return c.isEnabled();
                    } else {
                        return false;
                    }
                }
            }
    
            public void setEnabled(boolean b) {
                AccessibleContext ac = getCurrentAccessibleContext();
                if (ac instanceof AccessibleComponent) {
                    ((AccessibleComponent) ac).setEnabled(b);
                } else {
                    Component c = getCurrentComponent();
                    if (c != null) {
                        c.setEnabled(b);
                    }
                }
            }
    
            public boolean isVisible() {
                Rectangle pathBounds = tree.getPathBounds(path);
                Rectangle parentBounds = tree.getVisibleRect();
                if (pathBounds != null && parentBounds != null && 
                    parentBounds.intersects(pathBounds)) {
                    return true;
                } else {
                    return false;
                }
            }
    
            public void setVisible(boolean b) {
            }
    
            public boolean isShowing() {
                return (tree.isShowing() && isVisible());
            }
    
            public boolean contains(Point p) {
                AccessibleContext ac = getCurrentAccessibleContext();
                if (ac instanceof AccessibleComponent) {
                    Rectangle r = ((AccessibleComponent) ac).getBounds();
                    return r.contains(p);
                } else {
                    Component c = getCurrentComponent();
                    if (c != null) {
                        Rectangle r = c.getBounds();
                        return r.contains(p);
                    } else {
                        return getBounds().contains(p);
                    }
                }
            }
    
            public Point getLocationOnScreen() {
                if (tree != null) {
                    Point treeLocation = tree.getLocationOnScreen();
                    Rectangle pathBounds = tree.getPathBounds(path);
                    if (treeLocation != null && pathBounds != null) {
                        Point nodeLocation = new Point(pathBounds.x,
                                                       pathBounds.y);
                        nodeLocation.translate(treeLocation.x, treeLocation.y);
                        return nodeLocation;
                    } else {
                        return null;
                    }
                } else {
                    return null;
                }
            }

            protected Point getLocationInJTree() {
                Rectangle r = tree.getPathBounds(path);
                if (r != null) {
                    return r.getLocation();
                } else {
                    return null;
                }
            }

            public Point getLocation() {
                Rectangle r = getBounds();
                if (r != null) {
                    return r.getLocation();
                } else {
                    return null;
                }
            }
    
            public void setLocation(Point p) {
            }
                
            public Rectangle getBounds() {
                Rectangle r = tree.getPathBounds(path);
                Accessible parent = getAccessibleParent();
                if (parent != null) {
                    if (parent instanceof AccessibleJTreeNode) {
                        Point parentLoc = ((AccessibleJTreeNode) parent).getLocationInJTree();
                        if (parentLoc != null && r != null) {
                            r.translate(-parentLoc.x, -parentLoc.y);
                        } else {
                            return null;        // not visible!
                        }
                    } 
                }
                return r;
            }
    
            public void setBounds(Rectangle r) {
                AccessibleContext ac = getCurrentAccessibleContext();
                if (ac instanceof AccessibleComponent) {
                    ((AccessibleComponent) ac).setBounds(r);
                } else {
                    Component c = getCurrentComponent();
                    if (c != null) {
                        c.setBounds(r);
                    }
                }
            }
    
            public Dimension getSize() {
                return getBounds().getSize();
            }
    
            public void setSize (Dimension d) {
                AccessibleContext ac = getCurrentAccessibleContext();
                if (ac instanceof AccessibleComponent) {
                    ((AccessibleComponent) ac).setSize(d);
                } else {
                    Component c = getCurrentComponent();
                    if (c != null) {
                        c.setSize(d);
                    }
                }
            }
    
            /**
             * Returns the <code>Accessible</code> child, if one exists,
             * contained at the local coordinate <code>Point</code>.
             * Otherwise returns <code>null</code>.
             *
             * @param p point in local coordinates of this
             *    <code>Accessible</code>
             * @return the <code>Accessible</code>, if it exists,
             *    at the specified location; else <code>null</code>
             */
            public Accessible getAccessibleAt(Point p) {
                AccessibleContext ac = getCurrentAccessibleContext();
                if (ac instanceof AccessibleComponent) {
                    return ((AccessibleComponent) ac).getAccessibleAt(p);
                } else {
                    return null;
                }
            }
    
            public boolean isFocusTraversable() {
                AccessibleContext ac = getCurrentAccessibleContext();
                if (ac instanceof AccessibleComponent) {
                    return ((AccessibleComponent) ac).isFocusTraversable();
                } else {
                    Component c = getCurrentComponent();
                    if (c != null) {
                        return c.isFocusTraversable();
                    } else {
                        return false;
                    }
                }
            }
    
            public void requestFocus() {
                AccessibleContext ac = getCurrentAccessibleContext();
                if (ac instanceof AccessibleComponent) {
                    ((AccessibleComponent) ac).requestFocus();
                } else {
                    Component c = getCurrentComponent();
                    if (c != null) {
                        c.requestFocus();
                    }
                }
            }
    
            public void addFocusListener(FocusListener l) {
                AccessibleContext ac = getCurrentAccessibleContext();
                if (ac instanceof AccessibleComponent) {
                    ((AccessibleComponent) ac).addFocusListener(l);
                } else {
                    Component c = getCurrentComponent();
                    if (c != null) {
                        c.addFocusListener(l);
                    }
                }
            }
    
            public void removeFocusListener(FocusListener l) {
                AccessibleContext ac = getCurrentAccessibleContext();
                if (ac instanceof AccessibleComponent) {
                    ((AccessibleComponent) ac).removeFocusListener(l);
                } else {
                    Component c = getCurrentComponent();
                    if (c != null) {
                        c.removeFocusListener(l);
                    }
                }
            }

        // AccessibleSelection methods

            /**
             * Returns the number of items currently selected.
             * If no items are selected, the return value will be 0.
             *
             * @return the number of items currently selected.
             */
            public int getAccessibleSelectionCount() {
                int count = 0;
                int childCount = getAccessibleChildrenCount();
                for (int i = 0; i < childCount; i++) {
                    TreePath childPath = getChildTreePath(i);
                    if (tree.isPathSelected(childPath)) {
                       count++;
                    }
                } 
                return count;
            }

            /**
             * Returns an Accessible representing the specified selected item
             * in the object.  If there isn't a selection, or there are 
             * fewer items selected than the integer passed in, the return
             * value will be null.
             *
             * @param i the zero-based index of selected items
             * @return an Accessible containing the selected item
             */
            public Accessible getAccessibleSelection(int i) {
                int childCount = getAccessibleChildrenCount();
                if (i < 0 || i >= childCount) {
                    return null;        // out of range
                }
                int count = 0;
                for (int j = 0; j < childCount && i >= count; j++) {
                    TreePath childPath = getChildTreePath(j);
                    if (tree.isPathSelected(childPath)) { 
                        if (count == i) {
                            return new AccessibleJTreeNode(tree, childPath, this);
                        } else {
                            count++;
                        }
                    }
                }
                return null;
            }

            /**
             * Returns true if the current child of this object is selected.
             *
             * @param i the zero-based index of the child in this Accessible 
             * object.
             * @see AccessibleContext#getAccessibleChild
             */
            public boolean isAccessibleChildSelected(int i) {
                int childCount = getAccessibleChildrenCount();
                if (i < 0 || i >= childCount) {
                    return false;       // out of range
                } else {
                    TreePath childPath = getChildTreePath(i);
                    return tree.isPathSelected(childPath);
                }
            }

            /**
             * Adds the specified selected item in the object to the object's
             * selection.  If the object supports multiple selections,
             * the specified item is added to any existing selection, otherwise
             * it replaces any existing selection in the object.  If the
             * specified item is already selected, this method has no effect.
             *
             * @param i the zero-based index of selectable items
             */
            public void addAccessibleSelection(int i) {
               TreeModel model = JTree.this.getModel();
               if (model != null) {
                   if (i >= 0 && i < getAccessibleChildrenCount()) {
                       TreePath path = getChildTreePath(i);
                       JTree.this.addSelectionPath(path);
                    }
                }
            }

            /**
             * Removes the specified selected item in the object from the 
             * object's
             * selection.  If the specified item isn't currently selected, this
             * method has no effect.
             *
             * @param i the zero-based index of selectable items
             */
            public void removeAccessibleSelection(int i) {
               TreeModel model = JTree.this.getModel();
               if (model != null) {
                   if (i >= 0 && i < getAccessibleChildrenCount()) {
                       TreePath path = getChildTreePath(i);
                       JTree.this.removeSelectionPath(path);
                    }
                }
            }

            /**
             * Clears the selection in the object, so that nothing in the
             * object is selected.
             */
            public void clearAccessibleSelection() {
                int childCount = getAccessibleChildrenCount();
                for (int i = 0; i < childCount; i++) {
                    removeAccessibleSelection(i);
                }
            }

            /**
             * Causes every selected item in the object to be selected
             * if the object supports multiple selections.
             */
            public void selectAllAccessibleSelection() {
               TreeModel model = JTree.this.getModel();
               if (model != null) {
                   int childCount = getAccessibleChildrenCount();
                   TreePath path;
                   for (int i = 0; i < childCount; i++) {
                       path = getChildTreePath(i);
                       JTree.this.addSelectionPath(path);
                   }
                }
            }

        // AccessibleAction methods

            /**
             * Returns the number of accessible actions available in this 
             * tree node.  If this node is not a leaf, there is at least 
             * one action (toggle expand), in addition to any available
             * on the object behind the TreeCellRenderer.
             *
             * @return the number of Actions in this object
             */
            public int getAccessibleActionCount() {
                AccessibleContext ac = getCurrentAccessibleContext();
                if (ac != null) {
                    AccessibleAction aa = ac.getAccessibleAction();
                    if (aa != null) {
                        return (aa.getAccessibleActionCount() + (isLeaf ? 0 : 1));
                    }
                }
                return isLeaf ? 0 : 1;
            }

            /**
             * Return a description of the specified action of the tree node.
             * If this node is not a leaf, there is at least one action
             * description (toggle expand), in addition to any available
             * on the object behind the TreeCellRenderer.
             *
             * @param i zero-based index of the actions
             * @return a description of the action
             */
            public String getAccessibleActionDescription(int i) {
                if (i < 0 || i >= getAccessibleActionCount()) {
                    return null;
                }
                AccessibleContext ac = getCurrentAccessibleContext();
                if (i == 0) {
                    // TIGER - 4766636
                    return AccessibleAction.TOGGLE_EXPAND;
                } else if (ac != null) {
                    AccessibleAction aa = ac.getAccessibleAction();
                    if (aa != null) {
                        return aa.getAccessibleActionDescription(i - 1);
                    }
                }
                return null;
            }

            /**
             * Perform the specified Action on the tree node.  If this node
             * is not a leaf, there is at least one action which can be
             * done (toggle expand), in addition to any available on the 
             * object behind the TreeCellRenderer.
             *
             * @param i zero-based index of actions
             * @return true if the the action was performed; else false.
             */
            public boolean doAccessibleAction(int i) {
                if (i < 0 || i >= getAccessibleActionCount()) {
                    return false;
                }
                AccessibleContext ac = getCurrentAccessibleContext();
                if (i == 0) {
                    if (JTree.this.isExpanded(path)) {
                        JTree.this.collapsePath(path);
                    } else {
                        JTree.this.expandPath(path);
                    }
                    return true;
                } else if (ac != null) {
                    AccessibleAction aa = ac.getAccessibleAction();
                    if (aa != null) {
                        return aa.doAccessibleAction(i - 1);
                    }
                }
                return false;
            }

        } // inner class AccessibleJTreeNode

    }  // inner class AccessibleJTree

} // End of class JTree

Generated By: JavaOnTracks Doclet 0.1.4     ©Thibaut Colar