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Java > Open Source Codes > org > apache > tapestry > enhance > InjectListenerRegistrationWorker


1 // Copyright 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.enhance;
16
17 import org.apache.tapestry.IComponent;
18 import org.apache.tapestry.spec.IComponentSpecification;
19
20 /**
21  * Checks to see if the component implements a specific interface, and adds code to the component's
22  * finishLoad() method to register (with the page) for such notifications.
23  *
24  * @author Howard M. Lewis Ship
25  * @since 4.0
26  */
27 public class InjectListenerRegistrationWorker implements EnhancementWorker
28 {
29     private Class JavaDoc _listenerInterface;
30
31     private String JavaDoc _registerMethodName;
32
33     public void performEnhancement(EnhancementOperation op, IComponentSpecification spec)
34     {
35
36         if (op.implementsInterface(_listenerInterface))
37         {
38             op.extendMethodImplementation(
39                     IComponent.class,
40                     EnhanceUtils.FINISH_LOAD_SIGNATURE,
41                     "getPage()." + _registerMethodName + "(this);");
42         }
43     }
44
45     public void setListenerInterface(Class JavaDoc listenerInterface)
46     {
47         _listenerInterface = listenerInterface;
48     }
49
50     public void setRegisterMethodName(String JavaDoc registerMethodName)
51     {
52         _registerMethodName = registerMethodName;
53     }
54 }
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