API Overview API Index Package Overview Direct link to this page
JDK 1.6
  java.io. ObjectStreamConstants 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

/*
 * @(#)ObjectStreamConstants.java	1.36 06/04/07
 *
 * Copyright 2006 Sun Microsystems, Inc. All rights reserved.
 * SUN PROPRIETARY/CONFIDENTIAL. Use is subject to license terms.
 */

package java.io;

/**
 * Constants written into the Object Serialization Stream. 
 *
 * @author  unascribed
 * @version 1.36, 04/07/06
 * @since JDK 1.1
 */
public interface ObjectStreamConstants {

    /**
     * Magic number that is written to the stream header.
     */
    final static short STREAM_MAGIC = (short)0xaced;

    /**
     * Version number that is written to the stream header.
     */
    final static short STREAM_VERSION = 5;

    /* Each item in the stream is preceded by a tag
     */

    /** 
     * First tag value.
     */
    final static byte TC_BASE = 0x70;

    /**
     * Null object reference.
     */
    final static byte TC_NULL = 	(byte)0x70;

    /**
     * Reference to an object already written into the stream.
     */
    final static byte TC_REFERENCE =	(byte)0x71;

    /**
     * new Class Descriptor.
     */
    final static byte TC_CLASSDESC = 	(byte)0x72;

    /**
     * new Object.
     */
    final static byte TC_OBJECT = 	(byte)0x73;

    /** 
     * new String.
     */
    final static byte TC_STRING = 	(byte)0x74;

    /**
     * new Array.
     */
    final static byte TC_ARRAY = 	(byte)0x75;

    /**
     * Reference to Class.
     */
    final static byte TC_CLASS = 	(byte)0x76;

    /**
     * Block of optional data. Byte following tag indicates number
     * of bytes in this block data.
     */
    final static byte TC_BLOCKDATA = 	(byte)0x77;

    /** 
     * End of optional block data blocks for an object.
     */
    final static byte TC_ENDBLOCKDATA =	(byte)0x78;

    /**
     * Reset stream context. All handles written into stream are reset.
     */
    final static byte TC_RESET = 	(byte)0x79;
    
    /**
     * long Block data. The long following the tag indicates the
     * number of bytes in this block data.
     */
    final static byte TC_BLOCKDATALONG= (byte)0x7A;
    
    /**
     * Exception during write. 
     */
    final static byte TC_EXCEPTION = 	(byte)0x7B;

    /**
     * Long string.
     */
    final static byte TC_LONGSTRING = 	(byte)0x7C;

    /**
     * new Proxy Class Descriptor.
     */
    final static byte TC_PROXYCLASSDESC =	(byte)0x7D;

    /**
     * new Enum constant.
     * @since 1.5
     */
    final static byte TC_ENUM =		(byte)0x7E;

    /** 
     * Last tag value.
     */
    final static byte TC_MAX = 		(byte)0x7E;

    /**
     * First wire handle to be assigned. 
     */
    final static int baseWireHandle = 0x7e0000;


    /******************************************************/
    /* Bit masks for ObjectStreamClass flag.*/

    /** 
     * Bit mask for ObjectStreamClass flag. Indicates a Serializable class 
     * defines its own writeObject method.
     */
    final static byte SC_WRITE_METHOD = 0x01;

    /**
     * Bit mask for ObjectStreamClass flag. Indicates Externalizable data 
     * written in Block Data mode.
     * Added for PROTOCOL_VERSION_2.
     *
     * @see #PROTOCOL_VERSION_2
     * @since 1.2
     */
    final static byte SC_BLOCK_DATA = 0x08;  

    /**
     * Bit mask for ObjectStreamClass flag. Indicates class is Serializable.
     */
    final static byte SC_SERIALIZABLE = 0x02;

    /**
     * Bit mask for ObjectStreamClass flag. Indicates class is Externalizable.
     */
    final static byte SC_EXTERNALIZABLE = 0x04;

    /**
     * Bit mask for ObjectStreamClass flag. Indicates class is an enum type.
     * @since 1.5
     */
    final static byte SC_ENUM = 0x10;

    
    /* *******************************************************************/
    /* Security permissions */

    /**
     * Enable substitution of one object for another during 
     * serialization/deserialization.
     *
     * @see java.io.ObjectOutputStream#enableReplaceObject(boolean)
     * @see java.io.ObjectInputStream#enableResolveObject(boolean)
     * @since 1.2
     */
    final static SerializablePermission SUBSTITUTION_PERMISSION =
                           new SerializablePermission("enableSubstitution");

    /**
     * Enable overriding of readObject and writeObject.
     *
     * @see java.io.ObjectOutputStream#writeObjectOverride(Object)
     * @see java.io.ObjectInputStream#readObjectOverride()
     * @since 1.2
     */
    final static SerializablePermission SUBCLASS_IMPLEMENTATION_PERMISSION =
                    new SerializablePermission("enableSubclassImplementation");
   /**
    * A Stream Protocol Version. <p>
    * 
    * All externalizable data is written in JDK 1.1 external data 
    * format after calling this method. This version is needed to write 
    * streams containing Externalizable data that can be read by 
    * pre-JDK 1.1.6 JVMs.
    *
    * @see java.io.ObjectOutputStream#useProtocolVersion(int)
    * @since 1.2
    */
    public final static int PROTOCOL_VERSION_1 = 1;

    
   /**
    * A Stream Protocol Version. <p>
    * 
    * This protocol is written by JVM 1.2.
    *
    * Externalizable data is written in block data mode and is 
    * terminated with TC_ENDBLOCKDATA. Externalizable classdescriptor
    * flags has SC_BLOCK_DATA enabled. JVM 1.1.6 and greater can 
    * read this format change.
    *
    * Enables writing a nonSerializable class descriptor into the
    * stream. The serialVersionUID of a nonSerializable class is 
    * set to 0L. 
    *
    * @see java.io.ObjectOutputStream#useProtocolVersion(int)
    * @see #SC_BLOCK_DATA
    * @since 1.2
    */
    public final static int PROTOCOL_VERSION_2 = 2;
}

Generated By: JavaOnTracks Doclet 0.1.4     ©Thibaut Colar