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 015package org.apache.tapestry.enhance; 016 017import org.apache.tapestry.IComponent; 018import org.apache.tapestry.spec.IComponentSpecification; 019 020/** 021 * Checks to see if the component implements a specific interface, and adds code to the component's 022 * finishLoad() method to register (with the page) for such notifications. 023 * 024 * @author Howard M. Lewis Ship 025 * @since 4.0 026 */ 027public class InjectListenerRegistrationWorker implements EnhancementWorker 028{ 029 private Class _listenerInterface; 030 031 private String _registerMethodName; 032 033 public void performEnhancement(EnhancementOperation op, IComponentSpecification spec) 034 { 035 036 if (op.implementsInterface(_listenerInterface)) 037 { 038 op.extendMethodImplementation( 039 IComponent.class, 040 EnhanceUtils.FINISH_LOAD_SIGNATURE, 041 "getPage()." + _registerMethodName + "(this);"); 042 } 043 } 044 045 public void setListenerInterface(Class listenerInterface) 046 { 047 _listenerInterface = listenerInterface; 048 } 049 050 public void setRegisterMethodName(String registerMethodName) 051 { 052 _registerMethodName = registerMethodName; 053 } 054}