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}