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Java > Open Source Codes > org > apache > cocoon > forms > event > DeferredValueChangedEvent


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.forms.event;
17
18 import org.apache.cocoon.forms.formmodel.Widget;
19
20 /**
21  * A {@link ValueChangedEvent} that defers getting the new value from the widget
22  * until it's actually requested.
23  * <p>
24  * This allows widget validity to be checked only if a listener actually uses the
25  * value, thus avoiding unnecessary validation warnings when a user clicks an action.
26  *
27  * @author <a HREF="http://www.apache.org/~sylvain/">Sylvain Wallez</a>
28  * @version $Id: DeferredValueChangedEvent.java 151179 2005-02-03 16:55:16Z tim $
29  */
30 public class DeferredValueChangedEvent extends ValueChangedEvent {
31     
32     public DeferredValueChangedEvent(Widget source, Object JavaDoc oldValue) {
33         super(source, oldValue, null);
34     }
35     
36     public Object JavaDoc getNewValue() {
37         return getSourceWidget().getValue();
38     }
39 }
40
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