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.error; 016 017import java.io.IOException; 018 019import org.apache.hivemind.util.PropertyUtils; 020import org.apache.tapestry.IPage; 021import org.apache.tapestry.IRequestCycle; 022import org.apache.tapestry.StaleLinkException; 023import org.apache.tapestry.services.ResponseRenderer; 024 025/** 026 * Implementation of {@link org.apache.tapestry.error.StaleLinkExceptionPresenter} that uses a page 027 * to present the exception. The page must implement a property named "message" of type String and 028 * should present that message to the user. 029 * 030 * @author Howard M. Lewis Ship 031 * @since 4.0 032 */ 033public class StaleLinkExceptionPresenterImpl implements StaleLinkExceptionPresenter 034{ 035 private ResponseRenderer _responseRenderer; 036 037 private String _pageName; 038 039 public void presentStaleLinkException(IRequestCycle cycle, StaleLinkException cause) 040 throws IOException 041 { 042 IPage exceptionPage = cycle.getPage(_pageName); 043 044 PropertyUtils.write(exceptionPage, "message", cause.getMessage()); 045 046 cycle.activate(exceptionPage); 047 048 _responseRenderer.renderResponse(cycle); 049 } 050 051 public void setPageName(String pageName) 052 { 053 _pageName = pageName; 054 } 055 056 public void setResponseRenderer(ResponseRenderer responseRenderer) 057 { 058 _responseRenderer = responseRenderer; 059 } 060 061}