Classes in this File | Line Coverage | Branch Coverage | Complexity | ||||
PropertyChangeObserver |
|
| 1.0;1 |
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 | package org.apache.tapestry.record; | |
15 | ||
16 | import org.apache.tapestry.IComponent; | |
17 | import org.apache.tapestry.Tapestry; | |
18 | ||
19 | ||
20 | /** | |
21 | * Core service that is consulted anytime a specified component property is set. This service | |
22 | * is intended to be used as a means of intercepting component property state objects so that | |
23 | * their individual properties can be observed independently from basic set/get operations | |
24 | * done on page/component properties. | |
25 | * | |
26 | */ | |
27 | public interface PropertyChangeObserver | |
28 | { | |
29 | ||
30 | /** | |
31 | * Invoked by the enhanced property workers any time a {@link IComponent} property is set, either | |
32 | * by an initial value binding or explicitly through an abstract setter. | |
33 | * | |
34 | * @param component | |
35 | * The component that this property is attached to. | |
36 | * @param property | |
37 | * The object to observe changes on, may be null. | |
38 | * @param propertyName | |
39 | * The name of the property being observed - needed for doing things like calling | |
40 | * {@link Tapestry#fireObservedChange(IComponent, String, Object)}. | |
41 | * @return Expected to return either the same exact instance passed in or one that is proxied but still | |
42 | * maintains the original state of the object. | |
43 | */ | |
44 | Object observePropertyChanges(IComponent component, Object property, String propertyName); | |
45 | } |