PropertyChangeListenerProxy


1   /*
2    * @(#)PropertyChangeListenerProxy.java 1.4 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  /**
11   * A class which extends the <code>EventListenerProxy</code> specifically 
12   * for adding a named <code>PropertyChangeListener</code>. Instances of
13   * this class can be added as <code>PropertyChangeListener</code> to
14   * an object. 
15   * <p>
16   * If the object has a <code>getPropertyChangeListeners()</code>
17   * method then the array returned could be a mixture of 
18   * <code>PropertyChangeListener</code> and
19   * <code>PropertyChangeListenerProxy</code> objects.
20   * 
21   * @see java.util.EventListenerProxy
22   * @since 1.4
23   */
24  public class PropertyChangeListenerProxy extends java.util.EventListenerProxy  
25          implements PropertyChangeListener   {
26  
27      private String   propertyName;
28  
29      /**
30       * Constructor which binds the PropertyChangeListener to a specific
31       * property.
32       * 
33       * @param listener The listener object
34       * @param propertyName The name of the property to listen on.
35       */ 
36      public PropertyChangeListenerProxy(String   propertyName, 
37              PropertyChangeListener   listener) {
38          // XXX - msd NOTE: I changed the order of the arguments so that it's
39          // similar to PropertyChangeSupport.addPropertyChangeListener(String,
40          // PropertyChangeListener);
41          super(listener);
42          this.propertyName = propertyName;
43      }
44  
45      /**
46       * Forwards the property change event to the listener delegate.
47       *
48       * @param evt the property change event
49       */
50      public void propertyChange(PropertyChangeEvent   evt) {
51          ((PropertyChangeListener  )getListener()).propertyChange(evt);
52      }
53  
54      /**
55       * Returns the name of the named property associated with the
56       * listener.
57       */
58      public String   getPropertyName() {
59          return propertyName;
60      }
61  }
62
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