Source Code Cross Referenced for HttpResponseStream.java in  » Web-Server » Rimfaxe-Web-Server » org » apache » catalina » connector » http » Java Source Code / Java DocumentationJava Source Code and Java Documentation

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Java Source Code / Java Documentation » Web Server » Rimfaxe Web Server » org.apache.catalina.connector.http 
Source Cross Referenced  Class Diagram Java Document (Java Doc) 


001:        /*
002:         * $Header: /home/cvs/jakarta-tomcat-4.0/catalina/src/share/org/apache/catalina/connector/http/HttpResponseStream.java,v 1.14 2002/03/18 07:15:40 remm Exp $
003:         * $Revision: 1.14 $
004:         * $Date: 2002/03/18 07:15:40 $
005:         *
006:         * ====================================================================
007:         *
008:         * The Apache Software License, Version 1.1
009:         *
010:         * Copyright (c) 1999 The Apache Software Foundation.  All rights
011:         * reserved.
012:         *
013:         * Redistribution and use in source and binary forms, with or without
014:         * modification, are permitted provided that the following conditions
015:         * are met:
016:         *
017:         * 1. Redistributions of source code must retain the above copyright
018:         *    notice, this list of conditions and the following disclaimer.
019:         *
020:         * 2. Redistributions in binary form must reproduce the above copyright
021:         *    notice, this list of conditions and the following disclaimer in
022:         *    the documentation and/or other materials provided with the
023:         *    distribution.
024:         *
025:         * 3. The end-user documentation included with the redistribution, if
026:         *    any, must include the following acknowlegement:
027:         *       "This product includes software developed by the
028:         *        Apache Software Foundation (http://www.apache.org/)."
029:         *    Alternately, this acknowlegement may appear in the software itself,
030:         *    if and wherever such third-party acknowlegements normally appear.
031:         *
032:         * 4. The names "The Jakarta Project", "Tomcat", and "Apache Software
033:         *    Foundation" must not be used to endorse or promote products derived
034:         *    from this software without prior written permission. For written
035:         *    permission, please contact apache@apache.org.
036:         *
037:         * 5. Products derived from this software may not be called "Apache"
038:         *    nor may "Apache" appear in their names without prior written
039:         *    permission of the Apache Group.
040:         *
041:         * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESSED OR IMPLIED
042:         * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
043:         * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
044:         * DISCLAIMED.  IN NO EVENT SHALL THE APACHE SOFTWARE FOUNDATION OR
045:         * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
046:         * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
047:         * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF
048:         * USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
049:         * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
050:         * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
051:         * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
052:         * SUCH DAMAGE.
053:         * ====================================================================
054:         *
055:         * This software consists of voluntary contributions made by many
056:         * individuals on behalf of the Apache Software Foundation.  For more
057:         * information on the Apache Software Foundation, please see
058:         * <http://www.apache.org/>.
059:         *
060:         * [Additional notices, if required by prior licensing conditions]
061:         *
062:         */
063:
064:        package org.apache.catalina.connector.http;
065:
066:        import java.io.IOException;
067:        import javax.servlet.http.HttpServletResponse;
068:        import javax.servlet.http.HttpServletRequest;
069:        import org.apache.catalina.Response;
070:        import org.apache.catalina.connector.ResponseStream;
071:
072:        /**
073:         * Response stream for the HTTP/1.1 connector. This stream will automatically
074:         * chunk the answer if using HTTP/1.1 and no Content-Length has been properly
075:         * set.
076:         *
077:         * @author <a href="mailto:remm@apache.org">Remy Maucherat</a>
078:         * @deprecated
079:         */
080:        public final class HttpResponseStream extends ResponseStream {
081:
082:            // ----------------------------------------------------------- Constructors
083:
084:            private static final int MAX_CHUNK_SIZE = 4096;
085:
086:            private static final String CRLF = "\r\n";
087:
088:            // ----------------------------------------------------------- Constructors
089:
090:            /**
091:             * Construct a servlet output stream associated with the specified Request.
092:             *
093:             * @param response The associated response
094:             */
095:            public HttpResponseStream(HttpResponseImpl response) {
096:
097:                super (response);
098:                checkChunking(response);
099:                checkHead(response);
100:
101:            }
102:
103:            // ----------------------------------------------------- Instance Variables
104:
105:            /**
106:             * True if chunking is allowed.
107:             */
108:            private boolean useChunking;
109:
110:            /**
111:             * True if printing a chunk.
112:             */
113:            private boolean writingChunk;
114:
115:            /**
116:             * True if no content should be written.
117:             */
118:            private boolean writeContent;
119:
120:            // -------------------------------------------- ServletOutputStream Methods
121:
122:            /**
123:             * Write the specified byte to our output stream.
124:             *
125:             * @param b The byte to be written
126:             *
127:             * @exception IOException if an input/output error occurs
128:             */
129:            public void write(int b) throws IOException {
130:
131:                if (suspended)
132:                    return;
133:
134:                if (!writeContent)
135:                    return;
136:
137:                if (useChunking && !writingChunk) {
138:                    writingChunk = true;
139:                    try {
140:                        print("1\r\n");
141:                        super .write(b);
142:                        println();
143:                    } finally {
144:                        writingChunk = false;
145:                    }
146:                } else {
147:                    super .write(b);
148:                }
149:
150:            }
151:
152:            /**
153:             * Write the specified byte array.
154:             */
155:            public void write(byte[] b, int off, int len) throws IOException {
156:
157:                if (suspended)
158:                    return;
159:
160:                if (!writeContent)
161:                    return;
162:
163:                if (useChunking && !writingChunk) {
164:                    if (len > 0) {
165:                        writingChunk = true;
166:                        try {
167:                            println(Integer.toHexString(len));
168:                            super .write(b, off, len);
169:                            println();
170:                        } finally {
171:                            writingChunk = false;
172:                        }
173:                    }
174:                } else {
175:                    super .write(b, off, len);
176:                }
177:
178:            }
179:
180:            /**
181:             * Close this output stream, causing any buffered data to be flushed and
182:             * any further output data to throw an IOException.
183:             */
184:            public void close() throws IOException {
185:
186:                if (suspended)
187:                    throw new IOException(sm
188:                            .getString("responseStream.suspended"));
189:
190:                if (!writeContent)
191:                    return;
192:
193:                if (useChunking) {
194:                    // Write the final chunk.
195:                    writingChunk = true;
196:                    try {
197:                        print("0\r\n\r\n");
198:                    } finally {
199:                        writingChunk = false;
200:                    }
201:                }
202:                super .close();
203:
204:            }
205:
206:            // -------------------------------------------------------- Package Methods
207:
208:            void checkChunking(HttpResponseImpl response) {
209:                // If any data has already been written to the stream, we must not
210:                // change the chunking mode
211:                if (count != 0)
212:                    return;
213:                // Check the basic cases in which we chunk
214:                useChunking = (!response.isCommitted()
215:                        && response.getContentLength() == -1 && response
216:                        .getStatus() != HttpServletResponse.SC_NOT_MODIFIED);
217:                if (!response.isChunkingAllowed() && useChunking) {
218:                    // If we should chunk, but chunking is forbidden by the connector,
219:                    // we close the connection
220:                    response.setHeader("Connection", "close");
221:                }
222:                // Don't chunk is the connection will be closed
223:                useChunking = (useChunking && !response.isCloseConnection());
224:                if (useChunking) {
225:                    response.setHeader("Transfer-Encoding", "chunked");
226:                } else if (response.isChunkingAllowed()) {
227:                    response.removeHeader("Transfer-Encoding", "chunked");
228:                }
229:            }
230:
231:            protected void checkHead(HttpResponseImpl response) {
232:                HttpServletRequest servletRequest = (HttpServletRequest) response
233:                        .getRequest();
234:                if ("HEAD".equals(servletRequest.getMethod())) {
235:                    writeContent = false;
236:                } else {
237:                    writeContent = true;
238:                }
239:            }
240:
241:        }
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