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1   /*
2    * Licensed to the Apache Software Foundation (ASF) under one
3    * or more contributor license agreements.  See the NOTICE file
4    * distributed with this work for additional information
5    * regarding copyright ownership.  The ASF licenses this file
6    * to you under the Apache License, Version 2.0 (the
7    * "License"); you may not use this file except in compliance
8    * with the License.  You may obtain a copy of the License at
9    *
10   *   http://www.apache.org/licenses/LICENSE-2.0
11   *
12   * Unless required by applicable law or agreed to in writing,
13   * software distributed under the License is distributed on an
14   * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
15   * KIND, either express or implied.  See the License for the
16   * specific language governing permissions and limitations
17   * under the License.
18   */
19  package javax.faces.event;
20  
21  import javax.faces.component.UIComponent;
22  
23  /**
24   * see Javadoc of <a href="http://java.sun.com/javaee/javaserverfaces/1.2/docs/api/index.html">JSF Specification</a>
25   * 
26   * @author Thomas Spiegl (latest modification by $Author: bommel $)
27   * @version $Revision: 1187700 $ $Date: 2011-10-22 12:19:37 +0000 (Sat, 22 Oct 2011) $
28   */
29  public class ValueChangeEvent extends FacesEvent
30  {
31      private static final long serialVersionUID = -2490528664421353795L;
32      // FIELDS
33      private Object _oldValue;
34      private Object _newValue;
35  
36      // CONSTRUCTORS
37      public ValueChangeEvent(UIComponent uiComponent, Object oldValue, Object newValue)
38      {
39          super(uiComponent);
40          if (uiComponent == null)
41              throw new IllegalArgumentException("uiComponent");
42          _oldValue = oldValue;
43          _newValue = newValue;
44      }
45  
46      // METHODS
47      public Object getNewValue()
48      {
49          return _newValue;
50      }
51  
52      public Object getOldValue()
53      {
54          return _oldValue;
55      }
56  
57      @Override
58      public boolean isAppropriateListener(FacesListener facesListeners)
59      {
60          return facesListeners instanceof ValueChangeListener;
61      }
62  
63      @Override
64      public void processListener(FacesListener facesListeners)
65      {
66          ((ValueChangeListener)facesListeners).processValueChange(this);
67      }
68  }