Find Usages Diff Raw Download HTML Widget
Start line:  
End line:  

Snippet Preview

Snippet HTML Code

Stack Overflow Questions 
1
  /*
2
   * Copyright 1996-2006 Sun Microsystems, Inc.  All Rights Reserved.
3
   * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
4
   *
5
   * This code is free software; you can redistribute it and/or modify it
6
   * under the terms of the GNU General Public License version 2 only, as
7
   * published by the Free Software Foundation.  Sun designates this
8
   * particular file as subject to the "Classpath" exception as provided
9
   * by Sun in the LICENSE file that accompanied this code.
10
  *
11
  * This code is distributed in the hope that it will be useful, but WITHOUT
12
  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
13
  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
14
  * version 2 for more details (a copy is included in the LICENSE file that
15
  * accompanied this code).
16
  *
17
  * You should have received a copy of the GNU General Public License version
18
  * 2 along with this work; if not, write to the Free Software Foundation,
19
  * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
20
  *
21
  * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
22
  * CA 95054 USA or visit www.sun.com if you need additional information or
23
  * have any questions.
24
  */
25
 
26
 package java.beans;
27
 
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.

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.

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.

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. 

53
 
54
 
55
 public class PropertyEditorManager {

    
Register an editor class to be used to edit values of a given target class.

First, if there is a security manager, its checkPropertiesAccess method is called. This could result in a SecurityException.

Parameters:
targetType the Class object of the type to be edited
editorClass the Class object of the editor class. If this is null, then any existing definition will be removed.
Throws:
java.lang.SecurityException if a security manager exists and its checkPropertiesAccess method doesn't allow setting of system properties.
See also:
java.lang.SecurityManager.checkPropertiesAccess()
71
 
72
 
73
     public static void registerEditor(Class<?> targetType, Class<?> editorClass) {
74
         SecurityManager sm = System.getSecurityManager();
75
         if (sm != null) {
76
             sm.checkPropertiesAccess();
77
         }
78
         initialize();
79
         if (editorClass == null) {
80
             .remove(targetType);
81
         } else {
82
             .put(targetType, editorClass);
83
         }
84
     }

    
Locate a value editor for a given target type.

Parameters:
targetType The Class object for the type to be edited
Returns:
An editor object for the given target class. The result is null if no suitable editor can be found.
92
 
93
 
94
     public static synchronized PropertyEditor findEditor(Class<?> targetType) {
95
         initialize();
96
         Class editorClass = (Class).get(targetType);
97
         if (editorClass != null) {
98
             try {
99
                 Object o = editorClass.newInstance();
100
                return (PropertyEditor)o;
101
            } catch (Exception ex) {
102
                ..println("Couldn't instantiate type editor \"" +
103
                        editorClass.getName() + "\" : " + ex);
104
            }
105
        }
107
        // Now try adding "Editor" to the class name.
109
        String editorName = targetType.getName() + "Editor";
110
        try {
111
            return (PropertyEditor) Introspector.instantiate(targetType, editorName);
112
        } catch (Exception ex) {
113
           // Silently ignore any errors.
114
        }
116
        // Now try looking for <searchPath>.fooEditor
117
        int index = editorName.lastIndexOf('.') + 1;
118
        if (index > 0) {
119
            editorName = editorName.substring(index);
120
        }
121
        for (String path : ) {
122
            String name = path + '.' + editorName;
123
            try {
124
                return (PropertyEditor) Introspector.instantiate(targetType, name);
125
            } catch (Exception ex) {
126
               // Silently ignore any errors.
127
            }
128
        }
130
        if (null != targetType.getEnumConstants()) {
131
            return new EnumEditor(targetType);
132
        }
133
        // We couldn't find a suitable Editor.
134
        return null;
135
    }

    
Gets the package names that will be searched for property editors.

Returns:
The array of package names that will be searched in order to find property editors.

The default value for this array is implementation-dependent, e.g. Sun implementation initially sets to {"sun.beans.editors"}.

145
    public static synchronized String[] getEditorSearchPath() {
146
        // Return a copy of the searchPath.
147
        String result[] = new String[.];
148
        System.arraycopy(, 0, result, 0, .);
149
        return result;
150
    }

    
Change the list of package names that will be used for finding property editors.

First, if there is a security manager, its checkPropertiesAccess method is called. This could result in a SecurityException.

Parameters:
path Array of package names.
Throws:
java.lang.SecurityException if a security manager exists and its checkPropertiesAccess method doesn't allow setting of system properties.
See also:
java.lang.SecurityManager.checkPropertiesAccess()
166
    public static synchronized void setEditorSearchPath(String path[]) {
167
        SecurityManager sm = System.getSecurityManager();
168
        if (sm != null) {
169
            sm.checkPropertiesAccess();
170
        }
171
        if (path == null) {
172
            path = new String[0];
173
        }
174
         = path;
175
    }
177
    private static synchronized void initialize() {
178
        if ( != null) {
179
            return;
180
        }
181
         = new java.util.Hashtable();
182
        .put(., ByteEditor.class);
183
        .put(., ShortEditor.class);
184
        .put(., IntegerEditor.class);
185
        .put(., LongEditor.class);
186
        .put(., BooleanEditor.class);
187
        .put(., FloatEditor.class);
188
        .put(., DoubleEditor.class);
189
    }
191
    private static String[] searchPath = { "sun.beans.editors" };
192
    private static java.util.Hashtable registry;
New to GrepCode? Check out our FAQ X