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Java > Open Source Codes > org > apache > tapestry > event > ChangeObserver


1 // Copyright 2004, 2005 The Apache Software Foundation
2 //
3 // Licensed under the Apache License, Version 2.0 (the "License");
4 // you may not use this file except in compliance with the License.
5 // You may obtain a copy of the License at
6 //
7 // http://www.apache.org/licenses/LICENSE-2.0
8 //
9 // Unless required by applicable law or agreed to in writing, software
10 // distributed under the License is distributed on an "AS IS" BASIS,
11 // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
12 // See the License for the specific language governing permissions and
13 // limitations under the License.
14
15 package org.apache.tapestry.event;
16
17 /**
18  * May observe changes in an object's properties. This is a "weak" variation
19  * on JavaBean's style bound properties. It is used when there will be at most
20  * a single listener on property changes, and that the listener is not interested
21  * in the old value.
22  *
23  * @author Howard Lewis Ship
24  *
25  **/
26
27 public interface ChangeObserver
28 {
29     /**
30      * Sent when the observed object changes a property. The event identifies
31      * the object, the property and the new value.
32      *
33      **/
34
35     public void observeChange(ObservedChangeEvent event);
36 }
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