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 26package java.beans; 27 28import java.util.EventListenerProxy; 29 30/** 31 * A class which extends the {@code EventListenerProxy} 32 * specifically for adding a {@code VetoableChangeListener} 33 * with a "constrained" property. 34 * Instances of this class can be added 35 * as {@code VetoableChangeListener}s to a bean 36 * which supports firing vetoable change events. 37 * <p> 38 * If the object has a {@code getVetoableChangeListeners} method 39 * then the array returned could be a mixture of {@code VetoableChangeListener} 40 * and {@code VetoableChangeListenerProxy} objects. 41 * 42 * @see java.util.EventListenerProxy 43 * @see VetoableChangeSupport#getVetoableChangeListeners 44 * @since 1.4 45 */ 46public class VetoableChangeListenerProxy 47 extends EventListenerProxy<VetoableChangeListener> 48 implements VetoableChangeListener { 49 50 private final String propertyName; 51 52 /** 53 * Constructor which binds the {@code VetoableChangeListener} 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 VetoableChangeListenerProxy(String propertyName, VetoableChangeListener 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 * @exception PropertyVetoException if the recipient wishes the property 70 * change to be rolled back 71 */ 72 public void vetoableChange(PropertyChangeEvent event) throws PropertyVetoException{ 73 getListener().vetoableChange(event); 74 } 75 76 /** 77 * Returns the name of the named property associated with the listener. 78 * 79 * @return the name of the named property associated with the listener 80 */ 81 public String getPropertyName() { 82 return this.propertyName; 83 } 84} 85