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.components; 016 017import org.apache.tapestry.AbstractComponent; 018import org.apache.tapestry.IActionListener; 019import org.apache.tapestry.IMarkupWriter; 020import org.apache.tapestry.IRequestCycle; 021import org.apache.tapestry.link.DirectLink; 022import org.apache.tapestry.listener.ListenerInvoker; 023 024/** 025 * Invokes a listener method, passing listener parameters. This is used when a page or component 026 * needs some setup logic that can be best accomplished in Java code. 027 * 028 * @author Howard M. Lewis Ship 029 * @since 4.0 030 */ 031public abstract class InvokeListener extends AbstractComponent 032{ 033 protected void renderComponent(IMarkupWriter writer, IRequestCycle cycle) 034 { 035 Object[] parameters = DirectLink.constructServiceParameters(getParameters()); 036 037 try 038 { 039 cycle.setListenerParameters(parameters); 040 041 getListenerInvoker().invokeListener(getListener(), this, cycle); 042 } 043 finally 044 { 045 cycle.setListenerParameters(null); 046 } 047 } 048 049 /** Parameter */ 050 public abstract IActionListener getListener(); 051 052 /** Parameter */ 053 public abstract Object getParameters(); 054 055 /** Injected */ 056 public abstract ListenerInvoker getListenerInvoker(); 057}