001/* 002 * Licensed to the Apache Software Foundation (ASF) under one or more 003 * contributor license agreements. See the NOTICE file distributed with 004 * this work for additional information regarding copyright ownership. 005 * The ASF licenses this file to You under the Apache License, Version 2.0 006 * (the "License"); you may not use this file except in compliance with 007 * the License. You may obtain a copy of the License at 008 * 009 * http://www.apache.org/licenses/LICENSE-2.0 010 * 011 * Unless required by applicable law or agreed to in writing, software 012 * distributed under the License is distributed on an "AS IS" BASIS, 013 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 014 * See the License for the specific language governing permissions and 015 * limitations under the License. 016 */ 017package org.apache.wicket.request.flow; 018 019import org.apache.wicket.request.ILogData; 020import org.apache.wicket.request.ILoggableRequestHandler; 021import org.apache.wicket.request.IRequestCycle; 022import org.apache.wicket.request.IRequestHandler; 023import org.apache.wicket.request.IRequestHandlerDelegate; 024import org.apache.wicket.request.RequestHandlerExecutor.ReplaceHandlerException; 025import org.apache.wicket.request.handler.logger.DelegateLogData; 026import org.apache.wicket.request.handler.logger.NoLogData; 027 028/** 029 * An exception that resets the response before executing the specified request handler 030 * 031 * @author Igor Vaynberg (ivaynberg) 032 * @author Jonathan Locke 033 */ 034public abstract class ResetResponseException extends ReplaceHandlerException 035{ 036 private static final long serialVersionUID = 1L; 037 038 /** 039 * Construct. 040 * 041 * @param handler 042 */ 043 protected ResetResponseException(final IRequestHandler handler) 044 { 045 super(new ResponseResettingDecorator(handler), true); 046 } 047 048 private static class ResponseResettingDecorator 049 implements 050 IRequestHandler, 051 IRequestHandlerDelegate, 052 ILoggableRequestHandler 053 { 054 private final IRequestHandler delegate; 055 056 private DelegateLogData logData; 057 058 /** 059 * Construct. 060 * 061 * @param delegate 062 */ 063 public ResponseResettingDecorator(final IRequestHandler delegate) 064 { 065 this.delegate = delegate; 066 } 067 068 @Override 069 public void detach(final IRequestCycle requestCycle) 070 { 071 delegate.detach(requestCycle); 072 073 if (logData == null) 074 { 075 ILogData delegateData; 076 if (delegate instanceof ILoggableRequestHandler) 077 delegateData = ((ILoggableRequestHandler)delegate).getLogData(); 078 else 079 delegateData = new NoLogData(); 080 logData = new DelegateLogData(delegateData); 081 } 082 } 083 084 @Override 085 public void respond(final IRequestCycle requestCycle) 086 { 087 requestCycle.getResponse().reset(); 088 delegate.respond(requestCycle); 089 } 090 091 @Override 092 public IRequestHandler getDelegateHandler() 093 { 094 return delegate; 095 } 096 097 /** {@inheritDoc} */ 098 @Override 099 public DelegateLogData getLogData() 100 { 101 return logData; 102 } 103 } 104}