001 // Copyright 2005 The Apache Software Foundation 002 // 003 // Licensed under the Apache License, Version 2.0 (the "License"); 004 // you may not use this file except in compliance with the License. 005 // You may obtain a copy of the License at 006 // 007 // http://www.apache.org/licenses/LICENSE-2.0 008 // 009 // Unless required by applicable law or agreed to in writing, software 010 // distributed under the License is distributed on an "AS IS" BASIS, 011 // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 012 // See the License for the specific language governing permissions and 013 // limitations under the License. 014 015 package org.apache.tapestry.enhance; 016 017 import org.apache.tapestry.IComponent; 018 import org.apache.tapestry.spec.IComponentSpecification; 019 020 /** 021 * Checks to see if the component implements a specific interface, and adds code 022 * to the component's finishLoad() method to register (with the page) for such 023 * notifications. 024 * 025 * @author Howard M. Lewis Ship 026 * @since 4.0 027 */ 028 public class InjectListenerRegistrationWorker implements EnhancementWorker 029 { 030 031 private Class _listenerInterface; 032 033 private String _registerMethodName; 034 035 public void performEnhancement(EnhancementOperation op, 036 IComponentSpecification spec) 037 { 038 039 if (op.implementsInterface(_listenerInterface)) 040 { 041 op.extendMethodImplementation(IComponent.class, 042 EnhanceUtils.FINISH_LOAD_SIGNATURE, "getPage()." 043 + _registerMethodName + "(this);"); 044 } 045 } 046 047 public void setListenerInterface(Class listenerInterface) 048 { 049 _listenerInterface = listenerInterface; 050 } 051 052 public void setRegisterMethodName(String registerMethodName) 053 { 054 _registerMethodName = registerMethodName; 055 } 056 }