1 /*
2 * Copyright 2000 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
28 import java.util.EventListenerProxy;
29
30 /**
31 * A class which extends the {@code EventListenerProxy}
32 * specifically for adding a {@code PropertyChangeListener}
33 * with a "bound" property.
34 * Instances of this class can be added
35 * as {@code PropertyChangeListener}s to a bean
36 * which supports firing property change events.
37 * <p>
38 * If the object has a {@code getPropertyChangeListeners} method
39 * then the array returned could be a mixture of {@code PropertyChangeListener}
40 * and {@code PropertyChangeListenerProxy} objects.
41 *
42 * @see java.util.EventListenerProxy
43 * @see PropertyChangeSupport#getPropertyChangeListeners
44 * @since 1.4
45 */
46 public class PropertyChangeListenerProxy
47 extends EventListenerProxy<PropertyChangeListener>
48 implements PropertyChangeListener {
49
50 private final String propertyName;
51
52 /**
53 * Constructor which binds the {@code PropertyChangeListener}
54 * to a specific property.
55 *
56 * @param propertyName the name of the property to listen on
57 * @param listener the listener object
58 */
59 public PropertyChangeListenerProxy(String propertyName, PropertyChangeListener listener) {
60 super(listener);
61 this.propertyName = propertyName;
62 }
63
64 /**
65 * Forwards the property change event to the listener delegate.
66 *
67 * @param event the property change event
68 */
69 public void propertyChange(PropertyChangeEvent event) {
70 getListener().propertyChange(event);
71 }
72
73 /**
74 * Returns the name of the named property associated with the listener.
75 *
76 * @return the name of the named property associated with the listener
77 */
78 public String getPropertyName() {
79 return this.propertyName;
80 }
81 }
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