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
/* * @(#)PropertyEditorManager.java 1.46 05/11/17 * * Copyright 2006 Sun Microsystems, Inc. All rights reserved. * SUN PROPRIETARY/CONFIDENTIAL. Use is subject to license terms. */ package java.beans; /** * The PropertyEditorManager can be used to locate a property editor for * any given type name. This property editor must support the * java.beans.PropertyEditor interface for editing a given object. * <P> * The PropertyEditorManager uses three techniques for locating an editor * for a given type. First, it provides a registerEditor method to allow * an editor to be specifically registered for a given type. Second it * tries to locate a suitable class by adding "Editor" to the full * qualified classname of the given type (e.g. "foo.bah.FozEditor"). * Finally it takes the simple classname (without the package name) adds * "Editor" to it and looks in a search-path of packages for a matching * class. * <P> * So for an input class foo.bah.Fred, the PropertyEditorManager would * first look in its tables to see if an editor had been registered for * foo.bah.Fred and if so use that. Then it will look for a * foo.bah.FredEditor class. Then it will look for (say) * standardEditorsPackage.FredEditor class. * <p> * Default PropertyEditors will be provided for the Java primitive types * "boolean", "byte", "short", "int", "long", "float", and "double"; and * for the classes java.lang.String. java.awt.Color, and java.awt.Font. */ public class PropertyEditorManager { /** * Register an editor class to be used to edit values of * a given target class. * * <p>First, if there is a security manager, its <code>checkPropertiesAccess</code> * method is called. This could result in a SecurityException. * * @param targetType the Class object of the type to be edited * @param editorClass the Class object of the editor class. If * this is null, then any existing definition will be removed. * @exception SecurityException if a security manager exists and its * <code>checkPropertiesAccess</code> method doesn't allow setting * of system properties. * @see SecurityManager#checkPropertiesAccess */ public static void registerEditor(Class<?> targetType, Class<?> editorClass) { SecurityManager sm = System.getSecurityManager(); if (sm != null) { sm.checkPropertiesAccess(); } initialize(); if (editorClass == null) { registry.remove(targetType); } else { registry.put(targetType, editorClass); } } /** * Locate a value editor for a given target type. * * @param targetType The Class object for the type to be edited * @return An editor object for the given target class. * The result is null if no suitable editor can be found. */ public static synchronized PropertyEditor findEditor(Class<?> targetType) { initialize(); Class editorClass = (Class)registry.get(targetType); if (editorClass != null) { try { Object o = editorClass.newInstance(); return (PropertyEditor)o; } catch (Exception ex) { System.err.println("Couldn't instantiate type editor \"" + editorClass.getName() + "\" : " + ex); } } // Now try adding "Editor" to the class name. String editorName = targetType.getName() + "Editor"; try { return (PropertyEditor) Introspector.instantiate(targetType, editorName); } catch (Exception ex) { // Silently ignore any errors. } // Now try looking for <searchPath>.fooEditor editorName = targetType.getName(); while (editorName.indexOf('.') > 0) { editorName = editorName.substring(editorName.indexOf('.')+1); } for (int i = 0; i < searchPath.length; i++) { String name = searchPath[i] + "." + editorName + "Editor"; try { return (PropertyEditor) Introspector.instantiate(targetType, name); } catch (Exception ex) { // Silently ignore any errors. } } // We couldn't find a suitable Editor. return null; } /** * Gets the package names that will be searched for property editors. * * @return The array of package names that will be searched in * order to find property editors. * <p> The default value for this array is implementation-dependent, * e.g. Sun implementation initially sets to {"sun.beans.editors"}. */ public static synchronized String[] getEditorSearchPath() { // Return a copy of the searchPath. String result[] = new String[searchPath.length]; for (int i = 0; i < searchPath.length; i++) { result[i] = searchPath[i]; } return result; } /** * Change the list of package names that will be used for * finding property editors. * * <p>First, if there is a security manager, its <code>checkPropertiesAccess</code> * method is called. This could result in a SecurityException. * * @param path Array of package names. * @exception SecurityException if a security manager exists and its * <code>checkPropertiesAccess</code> method doesn't allow setting * of system properties. * @see SecurityManager#checkPropertiesAccess */ public static synchronized void setEditorSearchPath(String path[]) { SecurityManager sm = System.getSecurityManager(); if (sm != null) { sm.checkPropertiesAccess(); } initialize(); if (path == null) { path = new String[0]; } searchPath = path; } private static synchronized void load(Class targetType, String name) { String editorName = name; for (int i = 0; i < searchPath.length; i++) { try { editorName = searchPath[i] + "." + name; Class cls = Class.forName(editorName); registry.put(targetType, cls); return; } catch (Exception ex) { // Drop through and try next package. } } // This shouldn't happen. System.err.println("load of " + editorName + " failed"); } private static synchronized void initialize() { if (registry != null) { return; } registry = new java.util.Hashtable(); load(Byte.TYPE, "ByteEditor"); load(Short.TYPE, "ShortEditor"); load(Integer.TYPE, "IntEditor"); load(Long.TYPE ,"LongEditor"); load(Boolean.TYPE, "BoolEditor"); load(Float.TYPE, "FloatEditor"); load(Double.TYPE, "DoubleEditor"); } private static String[] searchPath = { "sun.beans.editors" }; private static java.util.Hashtable registry; }