VetoableChangeListenerProxy


1   /*
2    * @(#)VetoableChangeListenerProxy.java 1.6 03/12/19
3    *
4    * Copyright 2004 Sun Microsystems, Inc. All rights reserved.
5    * SUN PROPRIETARY/CONFIDENTIAL. Use is subject to license terms.
6    */
7   
8   package java.beans;
9   
10  import java.util.EventListenerProxy  ;
11  
12  /**
13   * A class which extends the <code>EventListenerProxy</code> specifically 
14   * for associating a <code>VetoableChangeListener</code> with a "constrained"
15   * property. Instances of this class can be added as a 
16   * <code>VetoableChangeListener</code> to a bean which supports firing
17   * VetoableChange events.
18   * <p>
19   * If the object has a <code>getVetoableChangeListeners()</code>
20   * method then the array returned could be a mixture of 
21   * <code>VetoableChangeListener</code> and
22   * <code>VetoableChangeListenerProxy</code> objects.
23   * <p>
24   * @see java.util.EventListenerProxy
25   * @see VetoableChangeListener
26   * @see VetoableChangeSupport#getVetoableChangeListeners
27   * @since 1.4
28   */
29  public class VetoableChangeListenerProxy extends EventListenerProxy  
30          implements VetoableChangeListener   {
31      
32      private String   propertyName;
33  
34      /**
35      * @param propertyName The name of the property to listen on.
36      * @param listener The listener object
37      */ 
38      public VetoableChangeListenerProxy(String   propertyName,
39              VetoableChangeListener   listener) {
40          super(listener);
41          this.propertyName = propertyName;
42      }
43  
44      /**
45      * Forwards the property change event to the listener delegate.
46      *
47      * @param evt the property change event
48      *
49      * @exception PropertyVetoException if the recipient wishes the property
50      *              change to be rolled back.
51      */
52      public void vetoableChange(PropertyChangeEvent   evt) throws
53              PropertyVetoException  {
54          ((VetoableChangeListener  )getListener()).vetoableChange(evt);
55      }
56  
57      /**
58      * Returns the name of the named property associated with the
59      * listener.
60      */
61      public String   getPropertyName() {
62          return propertyName;
63      }
64  }
65
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