001 /* java.beans.PropertyEditorManager
002 Copyright (C) 1998 Free Software Foundation, Inc.
003
004 This file is part of GNU Classpath.
005
006 GNU Classpath is free software; you can redistribute it and/or modify
007 it under the terms of the GNU General Public License as published by
008 the Free Software Foundation; either version 2, or (at your option)
009 any later version.
010
011 GNU Classpath is distributed in the hope that it will be useful, but
012 WITHOUT ANY WARRANTY; without even the implied warranty of
013 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
014 General Public License for more details.
015
016 You should have received a copy of the GNU General Public License
017 along with GNU Classpath; see the file COPYING. If not, write to the
018 Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
019 02110-1301 USA.
020
021 Linking this library statically or dynamically with other modules is
022 making a combined work based on this library. Thus, the terms and
023 conditions of the GNU General Public License cover the whole
024 combination.
025
026 As a special exception, the copyright holders of this library give you
027 permission to link this library with independent modules to produce an
028 executable, regardless of the license terms of these independent
029 modules, and to copy and distribute the resulting executable under
030 terms of your choice, provided that you also meet, for each linked
031 independent module, the terms and conditions of the license of that
032 module. An independent module is a module which is not derived from
033 or based on this library. If you modify this library, you may extend
034 this exception to your version of the library, but you are not
035 obligated to do so. If you do not wish to do so, delete this
036 exception statement from your version. */
037
038
039 package java.beans;
040
041 import gnu.java.beans.editors.ColorEditor;
042 import gnu.java.beans.editors.FontEditor;
043 import gnu.java.beans.editors.NativeBooleanEditor;
044 import gnu.java.beans.editors.NativeByteEditor;
045 import gnu.java.beans.editors.NativeDoubleEditor;
046 import gnu.java.beans.editors.NativeFloatEditor;
047 import gnu.java.beans.editors.NativeIntEditor;
048 import gnu.java.beans.editors.NativeLongEditor;
049 import gnu.java.beans.editors.NativeShortEditor;
050 import gnu.java.beans.editors.StringEditor;
051 import gnu.java.lang.ClassHelper;
052
053 import java.awt.Color;
054 import java.awt.Font;
055
056 /**
057 * PropertyEditorManager is used to find property editors
058 * for various types (not necessarily Beans).<P>
059 *
060 * It first checks to see if the property editor is
061 * already registered; if it is, that property editor is
062 * used. Next it takes the type's classname and appends
063 * "Editor" to it, and searches first in the class's
064 * package and then in the property editor search path.
065 *
066 * <p>Default property editors are provided for:</p>
067 *
068 * <ol>
069 * <li>boolean, byte, short, int, long, float, and double</li>
070 * <li>java.lang.String</li>
071 * <li>java.awt.Color</li>
072 * <li>java.awt.Font</li>
073 * </ol>
074 *
075 * <p><strong>Spec Suggestion:</strong> Perhaps an editor for
076 * Filename or something like it should be provided. As well
077 * as char.</p>
078 *
079 * @author John Keiser
080 * @since 1.1
081 * @version 1.1.0, 29 Jul 1998
082 */
083
084 public class PropertyEditorManager
085 {
086 static java.util.Hashtable<Class<?>,Class<?>> editors =
087 new java.util.Hashtable<Class<?>,Class<?>>();
088 static String[] editorSearchPath = { "gnu.java.beans.editors",
089 "sun.beans.editors" };
090
091 static
092 {
093 registerEditor(Boolean.TYPE, NativeBooleanEditor.class);
094 registerEditor(Byte.TYPE, NativeByteEditor.class);
095 registerEditor(Short.TYPE, NativeShortEditor.class);
096 registerEditor(Integer.TYPE, NativeIntEditor.class);
097 registerEditor(Long.TYPE, NativeLongEditor.class);
098 registerEditor(Float.TYPE, NativeFloatEditor.class);
099 registerEditor(Double.TYPE, NativeDoubleEditor.class);
100 registerEditor(String.class, StringEditor.class);
101 registerEditor(Color.class, ColorEditor.class);
102 registerEditor(Font.class, FontEditor.class);
103 }
104
105 /**
106 * Beats me why this class can be instantiated, but there
107 * you have it.
108 */
109 public PropertyEditorManager()
110 {
111 // Do nothing here
112 }
113
114 /**
115 * Register an editor for a class. Replaces old editor
116 * if there was one registered before.
117 *
118 * @param editedClass the class that the property editor
119 * will edit.
120 * @param editorClass the PropertyEditor class.
121 */
122 public static void registerEditor(Class<?> editedClass, Class<?> editorClass)
123 {
124 editors.put(editedClass, editorClass);
125 }
126
127 /**
128 * Returns a new instance of the property editor for the
129 * specified class.
130 *
131 * @param editedClass the class that the property editor
132 * will edit.
133 * @return a PropertyEditor instance that can edit the
134 * specified class.
135 */
136 public static PropertyEditor findEditor(Class<?> editedClass)
137 {
138 try
139 {
140 Class found = (Class)editors.get(editedClass);
141 if(found != null)
142 {
143 return (PropertyEditor)found.newInstance();
144 }
145
146 ClassLoader contextClassLoader
147 = Thread.currentThread().getContextClassLoader();
148
149 try
150 {
151 found = Class.forName(editedClass.getName()+"Editor", true,
152 contextClassLoader);
153 registerEditor(editedClass,found);
154 return (PropertyEditor)found.newInstance();
155 }
156 catch(ClassNotFoundException E)
157 {
158 }
159
160 String appendName
161 = "."
162 + ClassHelper.getTruncatedClassName(editedClass)
163 + "Editor";
164 synchronized(editorSearchPath)
165 {
166 for(int i=0;i<editorSearchPath.length;i++)
167 {
168 try
169 {
170 found = Class.forName(editorSearchPath[i] + appendName,
171 true, contextClassLoader);
172 registerEditor(editedClass,found);
173 return (PropertyEditor)found.newInstance();
174 }
175 catch(ClassNotFoundException E)
176 {
177 }
178 }
179 }
180 }
181 catch(InstantiationException E)
182 {
183 }
184 catch(IllegalAccessException E)
185 {
186 }
187
188 return null;
189 }
190
191 /**
192 * Get the editor search path.
193 * As a minor departure from the spec, the default value
194 * for the editor search path is "gnu.java.beans.editors",
195 * "sun.beans.editors".
196 *
197 * @return the editor search path.
198 */
199 public static String[] getEditorSearchPath()
200 {
201 return editorSearchPath;
202 }
203
204 /**
205 * Set the editor search path.
206 *
207 * @param editorSearchPath the new value for the editor search path.
208 */
209 public static void setEditorSearchPath(String[] editorSearchPath)
210 {
211 synchronized(editorSearchPath)
212 {
213 PropertyEditorManager.editorSearchPath = editorSearchPath;
214 }
215 }
216 }