WidgetEventMulticaster


1   /*
2    * Copyright 1999-2004 The Apache Software Foundation.
3    * 
4    * Licensed under the Apache License, Version 2.0 (the "License");
5    * you may not use this file except in compliance with the License.
6    * You may obtain a copy of the License at
7    * 
8    *      http://www.apache.org/licenses/LICENSE-2.0
9    * 
10   * Unless required by applicable law or agreed to in writing, software
11   * distributed under the License is distributed on an "AS IS" BASIS,
12   * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13   * See the License for the specific language governing permissions and
14   * limitations under the License.
15   */
16  package org.apache.cocoon.woody.event;
17  
18  import java.awt.AWTEventMulticaster  ;
19  import java.util.EventListener  ;
20  
21  /**
22   * Convenience class to handle all widget event listeners. See
23   * <code>java.awt.AWTEventMulticaster</code> for more information on its use.
24   * 
25   * @author <a HREF="http://www.apache.org/~sylvain/">Sylvain Wallez</a>
26   * @version CVS $Id: WidgetEventMulticaster.java 30932 2004-07-29 17:35:38Z vgritsenko $
27   */
28  public class WidgetEventMulticaster extends AWTEventMulticaster   implements
29      ActionListener, ValueChangedListener, ProcessingPhaseListener {
30  
31      protected WidgetEventMulticaster(EventListener   a, EventListener   b) {
32          super(a, b);
33      }
34      
35      public static ActionListener add(ActionListener a, ActionListener b) {
36          return (ActionListener)addInternal(a, b);
37      }
38      
39      public static ActionListener remove(ActionListener l, ActionListener oldl) {
40          return (ActionListener)removeInternal(l, oldl);
41      }
42      
43      public void actionPerformed(ActionEvent e) {
44          ((ActionListener)a).actionPerformed(e);
45          ((ActionListener)b).actionPerformed(e);
46      }
47  
48      public static ValueChangedListener add(ValueChangedListener a, ValueChangedListener b) {
49          return (ValueChangedListener)addInternal(a, b);
50      }
51      
52      public static ValueChangedListener remove(ValueChangedListener l, ValueChangedListener oldl) {
53          return (ValueChangedListener)removeInternal(l, oldl);
54      }
55      
56      public void phaseEnded(ProcessingPhaseEvent e) {
57          ((ProcessingPhaseListener)a).phaseEnded(e);
58          ((ProcessingPhaseListener)b).phaseEnded(e);
59      }
60      
61      public static ProcessingPhaseListener add(ProcessingPhaseListener a, ProcessingPhaseListener b) {
62          return (ProcessingPhaseListener)addInternal(a, b);
63      }
64      
65      public static ProcessingPhaseListener remove(ProcessingPhaseListener l, ProcessingPhaseListener oldl) {
66          return (ProcessingPhaseListener)removeInternal(l, oldl);
67      }
68      
69      public void valueChanged(ValueChangedEvent e) {
70          ((ValueChangedListener)a).valueChanged(e);
71          ((ValueChangedListener)b).valueChanged(e);
72      }
73      
74      /**
75       * Can't use the superclass method since it creates an AWTEventMulticaster
76       */
77      protected static EventListener   addInternal(EventListener   a, EventListener   b) {
78          if (a == null)  return b;
79          if (b == null)  return a;
80          return new WidgetEventMulticaster(a, b);
81      }
82  }
83
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