1 /* 2 * Copyright (c) 2000, Oracle and/or its affiliates. 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. Oracle designates this 8 * particular file as subject to the "Classpath" exception as provided 9 * by Oracle 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 Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA 22 * or visit www.oracle.com if you need additional information or have any 23 * 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 */ PropertyChangeListenerProxy(String propertyName, PropertyChangeListener listener)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 */ propertyChange(PropertyChangeEvent event)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 */ getPropertyName()78 public String getPropertyName() { 79 return this.propertyName; 80 } 81 } 82