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 org.apache.hivemind.ApplicationRuntimeException; 018import org.apache.tapestry.IPage; 019import org.apache.tapestry.IRequestCycle; 020import org.apache.tapestry.services.ResponseRenderer; 021 022/** 023 * @author Howard M. Lewis Ship 024 * @since 4.0 025 */ 026public class ExceptionPresenterImpl implements ExceptionPresenter 027{ 028 private RequestExceptionReporter _requestExceptionReporter; 029 030 private ResponseRenderer _responseRenderer; 031 032 private String _exceptionPageName; 033 034 private boolean _verbose; 035 036 public void presentException(IRequestCycle cycle, Throwable cause) 037 { 038 try 039 { 040 IPage exceptionPage = cycle.getPage(_exceptionPageName); 041 042 exceptionPage.setProperty("exception", cause); 043 044 cycle.activate(exceptionPage); 045 046 _responseRenderer.renderResponse(cycle); 047 } 048 catch (Throwable ex) 049 { 050 // Worst case scenario. The exception page itself is broken, leaving 051 // us with no option but to write the cause to the output. 052 053 _requestExceptionReporter.reportRequestException(ErrorMessages 054 .unableToProcessClientRequest(cause), cause); 055 056 // Also, write the exception thrown when redendering the exception 057 // page, so that can get fixed as well. 058 059 _requestExceptionReporter.reportRequestException(ErrorMessages 060 .unableToPresentExceptionPage(ex), ex); 061 062 // And throw the exception. 063 064 throw new ApplicationRuntimeException(ex.getMessage(), ex); 065 } 066 067 if (_verbose) 068 _requestExceptionReporter.reportRequestException(ErrorMessages 069 .unableToProcessClientRequest(cause), cause); 070 } 071 072 public void setExceptionPageName(String exceptionPageName) 073 { 074 _exceptionPageName = exceptionPageName; 075 } 076 077 public void setRequestExceptionReporter(RequestExceptionReporter requestExceptionReporter) 078 { 079 _requestExceptionReporter = requestExceptionReporter; 080 } 081 082 public void setResponseRenderer(ResponseRenderer responseRenderer) 083 { 084 _responseRenderer = responseRenderer; 085 } 086 087 public boolean isVerbose() 088 { 089 return _verbose; 090 } 091 092 public void setVerbose(boolean verbose) 093 { 094 _verbose = verbose; 095 } 096}