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.request; 016 017import java.io.IOException; 018 019import javax.servlet.ServletException; 020import javax.servlet.http.HttpServletRequest; 021import javax.servlet.http.HttpServletResponse; 022 023import org.apache.tapestry.Tapestry; 024import org.apache.tapestry.services.ServletRequestServicer; 025import org.apache.tapestry.services.ServletRequestServicerFilter; 026import org.apache.tapestry.spec.ILibrarySpecification; 027 028/** 029 * Checks to see if a {@link org.apache.tapestry.request.IRequestDecoder}has been provided as an 030 * application extension, and (if so), creates a new HttpServletRequest wrapper around the decoded 031 * request. 032 * 033 * @author Howard M. Lewis Ship 034 * @since 4.0 035 */ 036public class DecodedRequestInjector implements ServletRequestServicerFilter 037{ 038 private ILibrarySpecification _applicationSpecification; 039 040 private IRequestDecoder _decoder; 041 042 public void initializeService() 043 { 044 if (_applicationSpecification.checkExtension(Tapestry.REQUEST_DECODER_EXTENSION_NAME)) 045 _decoder = (IRequestDecoder) _applicationSpecification.getExtension( 046 Tapestry.REQUEST_DECODER_EXTENSION_NAME, 047 IRequestDecoder.class); 048 } 049 050 public void service(HttpServletRequest request, HttpServletResponse response, 051 ServletRequestServicer servicer) throws IOException, ServletException 052 { 053 HttpServletRequest decodedRequest = _decoder == null ? request : wrapRequest(request); 054 055 servicer.service(decodedRequest, response); 056 } 057 058 public HttpServletRequest wrapRequest(HttpServletRequest request) 059 { 060 DecodedRequest decodedRequest = _decoder.decodeRequest(request); 061 062 return new DecodedRequestWrapper(request, decodedRequest); 063 } 064 065 public void setApplicationSpecification(ILibrarySpecification applicationSpecification) 066 { 067 _applicationSpecification = applicationSpecification; 068 } 069 070}