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. 014 015 package org.apache.tapestry.web; 016 017 import java.io.IOException; 018 import java.io.OutputStream; 019 import java.io.PrintWriter; 020 021 import javax.servlet.http.HttpServletResponse; 022 023 import org.apache.commons.logging.Log; 024 import org.apache.commons.logging.LogFactory; 025 import org.apache.hivemind.ApplicationRuntimeException; 026 import org.apache.hivemind.util.Defense; 027 import org.apache.tapestry.util.ContentType; 028 029 /** 030 * Adapts {@link javax.servlet.http.HttpServletResponse} as 031 * {@link org.apache.tapestry.web.WebResponse}. 032 * 033 * @author Howard M. Lewis Ship 034 * @since 4.0 035 */ 036 public class ServletWebResponse implements WebResponse 037 { 038 private static final Log LOG = LogFactory.getLog(ServletWebResponse.class); 039 040 private final HttpServletResponse _servletResponse; 041 042 private boolean _needsReset; 043 044 public ServletWebResponse(HttpServletResponse response) 045 { 046 Defense.notNull(response, "response"); 047 048 _servletResponse = response; 049 } 050 051 public OutputStream getOutputStream(ContentType contentType) 052 { 053 Defense.notNull(contentType, "contentType"); 054 055 _servletResponse.setContentType(contentType.getMimeType()); 056 057 try 058 { 059 return _servletResponse.getOutputStream(); 060 } 061 catch (IOException ex) 062 { 063 throw new ApplicationRuntimeException(WebMessages.streamOpenError(contentType, ex), 064 null, ex); 065 } 066 } 067 068 public PrintWriter getPrintWriter(ContentType contentType) throws IOException 069 { 070 Defense.notNull(contentType, "contentType"); 071 072 if (_needsReset) 073 reset(); 074 075 _needsReset = true; 076 077 _servletResponse.setContentType(contentType.toString()); 078 079 try 080 { 081 return _servletResponse.getWriter(); 082 } 083 catch (IOException ex) 084 { 085 throw new ApplicationRuntimeException(WebMessages.writerOpenError(contentType, ex), 086 null, ex); 087 } 088 } 089 090 public String encodeURL(String url) 091 { 092 return _servletResponse.encodeURL(url); 093 } 094 095 public void reset() 096 { 097 try 098 { 099 _servletResponse.reset(); 100 } 101 catch (IllegalStateException ex) 102 { 103 LOG.error(WebMessages.resetFailed(ex), ex); 104 } 105 } 106 107 public void setContentLength(int length) 108 { 109 _servletResponse.setContentLength(length); 110 } 111 112 public String getNamespace() 113 { 114 return ""; 115 } 116 117 public void setDateHeader(String name, long date) 118 { 119 _servletResponse.setDateHeader(name, date); 120 } 121 122 public void setStatus(int status) 123 { 124 _servletResponse.setStatus(status); 125 } 126 127 public void setHeader(String name, String value) 128 { 129 _servletResponse.setHeader(name, value); 130 } 131 132 public void setIntHeader(String name, int value) 133 { 134 _servletResponse.setIntHeader(name, value); 135 } 136 137 }