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