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.listener; 016 017import org.apache.hivemind.util.Defense; 018import org.apache.tapestry.IActionListener; 019import org.apache.tapestry.IComponent; 020import org.apache.tapestry.IRequestCycle; 021 022/** 023 * Adapter class that combines a target object (typically, a component) with a 024 * {@link org.apache.tapestry.listener.ListenerMethodInvoker}. This is the bridge from listener 025 * method names to listener method invocations. 026 * <p> 027 * TODO: It would really be nice if we could get the location of the listener binding into thrown 028 * exceptions. As implemented, as best, it will be the location of the <page-specification> 029 * (or <component>) of the page (or component) containing the listener method. 030 * 031 * @author Howard M. Lewis Ship 032 * @since 4.0 033 */ 034public class SyntheticListener implements IActionListener 035{ 036 private final Object _target; 037 038 private final ListenerMethodInvoker _invoker; 039 040 public SyntheticListener(Object target, ListenerMethodInvoker invoker) 041 { 042 Defense.notNull(target, "target"); 043 Defense.notNull(invoker, "invoker"); 044 045 _target = target; 046 _invoker = invoker; 047 } 048 049 public void actionTriggered(IComponent component, IRequestCycle cycle) 050 { 051 _invoker.invokeListenerMethod(_target, cycle); 052 } 053}