| // Copyright 2004 The Apache Software Foundation |
| // |
| // Licensed under the Apache License, Version 2.0 (the "License"); |
| // you may not use this file except in compliance with the License. |
| // You may obtain a copy of the License at |
| // |
| // http://www.apache.org/licenses/LICENSE-2.0 |
| // |
| // Unless required by applicable law or agreed to in writing, software |
| // distributed under the License is distributed on an "AS IS" BASIS, |
| // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| // See the License for the specific language governing permissions and |
| // limitations under the License. |
| |
| package org.apache.tapestry.event; |
| |
| /** |
| * May observe changes in an object's properties. This is a "weak" variation |
| * on JavaBean's style bound properties. It is used when there will be at most |
| * a single listener on property changes, and that the listener is not interested |
| * in the old value. |
| * |
| * @author Howard Lewis Ship |
| * @version $Id$ |
| * |
| **/ |
| |
| public interface ChangeObserver |
| { |
| /** |
| * Sent when the observed object changes a property. The event identifies |
| * the object, the property and the new value. |
| * |
| **/ |
| |
| public void observeChange(ObservedChangeEvent event); |
| } |