Source Code Cross Referenced for MimeMessageUtil.java in  » Net » james-2.3.1 » org » apache » james » core » Java Source Code / Java DocumentationJava Source Code and Java Documentation

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Java Source Code / Java Documentation » Net » james 2.3.1 » org.apache.james.core 
Source Cross Referenced  Class Diagram Java Document (Java Doc) 


001:        /****************************************************************
002:         * Licensed to the Apache Software Foundation (ASF) under one   *
003:         * or more contributor license agreements.  See the NOTICE file *
004:         * distributed with this work for additional information        *
005:         * regarding copyright ownership.  The ASF licenses this file   *
006:         * to you under the Apache License, Version 2.0 (the            *
007:         * "License"); you may not use this file except in compliance   *
008:         * with the License.  You may obtain a copy of the License at   *
009:         *                                                              *
010:         *   http://www.apache.org/licenses/LICENSE-2.0                 *
011:         *                                                              *
012:         * Unless required by applicable law or agreed to in writing,   *
013:         * software distributed under the License is distributed on an  *
014:         * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY       *
015:         * KIND, either express or implied.  See the License for the    *
016:         * specific language governing permissions and limitations      *
017:         * under the License.                                           *
018:         ****************************************************************/package org.apache.james.core;
019:
020:        import org.apache.james.util.InternetPrintWriter;
021:        import org.apache.james.util.io.IOUtil;
022:
023:        import javax.activation.UnsupportedDataTypeException;
024:        import javax.mail.MessagingException;
025:        import javax.mail.internet.MimeMessage;
026:        import javax.mail.internet.MimeUtility;
027:
028:        import java.io.BufferedWriter;
029:        import java.io.ByteArrayInputStream;
030:        import java.io.ByteArrayOutputStream;
031:        import java.io.IOException;
032:        import java.io.InputStream;
033:        import java.io.OutputStream;
034:        import java.io.OutputStreamWriter;
035:        import java.io.PrintWriter;
036:        import java.util.Enumeration;
037:
038:        /**
039:         * Utility class to provide optimized write methods for the various MimeMessage
040:         * implementations.
041:         */
042:        public class MimeMessageUtil {
043:
044:            /**
045:             * Convenience method to take any MimeMessage and write the headers and body to two
046:             * different output streams
047:             */
048:            public static void writeTo(MimeMessage message,
049:                    OutputStream headerOs, OutputStream bodyOs)
050:                    throws IOException, MessagingException {
051:                writeTo(message, headerOs, bodyOs, null);
052:            }
053:
054:            /**
055:             * Convenience method to take any MimeMessage and write the headers and body to two
056:             * different output streams, with an ignore list
057:             */
058:            public static void writeTo(MimeMessage message,
059:                    OutputStream headerOs, OutputStream bodyOs,
060:                    String[] ignoreList) throws IOException, MessagingException {
061:                MimeMessage testMessage = message;
062:                if (message instanceof  MimeMessageCopyOnWriteProxy) {
063:                    MimeMessageCopyOnWriteProxy wr = (MimeMessageCopyOnWriteProxy) message;
064:                    testMessage = wr.getWrappedMessage();
065:                }
066:                if (testMessage instanceof  MimeMessageWrapper) {
067:                    MimeMessageWrapper wrapper = (MimeMessageWrapper) testMessage;
068:                    if (!wrapper.isModified()) {
069:                        wrapper.writeTo(headerOs, bodyOs, ignoreList);
070:                        return;
071:                    }
072:                }
073:                writeToInternal(message, headerOs, bodyOs, ignoreList);
074:            }
075:
076:            /**
077:             * @param message
078:             * @param headerOs
079:             * @param bodyOs
080:             * @param ignoreList
081:             * @throws MessagingException
082:             * @throws IOException
083:             * @throws UnsupportedDataTypeException
084:             */
085:            public static void writeToInternal(MimeMessage message,
086:                    OutputStream headerOs, OutputStream bodyOs,
087:                    String[] ignoreList) throws MessagingException,
088:                    IOException, UnsupportedDataTypeException {
089:                if (message.getMessageID() == null) {
090:                    message.saveChanges();
091:                }
092:
093:                writeHeadersTo(message, headerOs, ignoreList);
094:
095:                // Write the body to the output stream
096:                writeMessageBodyTo(message, bodyOs);
097:            }
098:
099:            public static void writeMessageBodyTo(MimeMessage message,
100:                    OutputStream bodyOs) throws IOException,
101:                    UnsupportedDataTypeException, MessagingException {
102:                OutputStream bos;
103:                InputStream bis;
104:
105:                try {
106:                    // Get the message as a stream.  This will encode
107:                    // objects as necessary, and we have some input from
108:                    // decoding an re-encoding the stream.  I'd prefer the
109:                    // raw stream, but see
110:                    bos = MimeUtility.encode(bodyOs, message.getEncoding());
111:                    bis = message.getInputStream();
112:                } catch (UnsupportedDataTypeException udte) {
113:                    /* If we get an UnsupportedDataTypeException try using
114:                     * the raw input stream as a "best attempt" at rendering
115:                     * a message.
116:                     *
117:                     * WARNING: JavaMail v1.3 getRawInputStream() returns
118:                     * INVALID (unchanged) content for a changed message.
119:                     * getInputStream() works properly, but in this case
120:                     * has failed due to a missing DataHandler.
121:                     *
122:                     * MimeMessage.getRawInputStream() may throw a "no
123:                     * content" MessagingException.  In JavaMail v1.3, when
124:                     * you initially create a message using MimeMessage
125:                     * APIs, there is no raw content available.
126:                     * getInputStream() works, but getRawInputStream()
127:                     * throws an exception.  If we catch that exception,
128:                     * throw the UDTE.  It should mean that someone has
129:                     * locally constructed a message part for which JavaMail
130:                     * doesn't have a DataHandler.
131:                     */
132:
133:                    try {
134:                        bis = message.getRawInputStream();
135:                        bos = bodyOs;
136:                    } catch (javax.mail.MessagingException _) {
137:                        throw udte;
138:                    }
139:                } catch (javax.mail.MessagingException me) {
140:                    /* This could be another kind of MessagingException
141:                     * thrown by MimeMessage.getInputStream(), such as a
142:                     * javax.mail.internet.ParseException.
143:                     *
144:                     * The ParseException is precisely one of the reasons
145:                     * why the getRawInputStream() method exists, so that we
146:                     * can continue to stream the content, even if we cannot
147:                     * handle it.  Again, if we get an exception, we throw
148:                     * the one that caused us to call getRawInputStream().
149:                     */
150:                    try {
151:                        bis = message.getRawInputStream();
152:                        bos = bodyOs;
153:                    } catch (javax.mail.MessagingException _) {
154:                        throw me;
155:                    }
156:                }
157:
158:                try {
159:                    copyStream(bis, bos);
160:                } finally {
161:                    IOUtil.shutdownStream(bis);
162:                }
163:            }
164:
165:            /**
166:             * Convenience method to copy streams
167:             */
168:            public static void copyStream(InputStream in, OutputStream out)
169:                    throws IOException {
170:                // TODO: This is really a bad way to do this sort of thing.  A shared buffer to
171:                //       allow simultaneous read/writes would be a substantial improvement
172:                byte[] block = new byte[1024];
173:                int read = 0;
174:                while ((read = in.read(block)) > -1) {
175:                    out.write(block, 0, read);
176:                }
177:                out.flush();
178:            }
179:
180:            /**
181:             * Write the message headers to the given outputstream
182:             * 
183:             * @param message
184:             * @param headerOs
185:             * @param ignoreList
186:             * @throws MessagingException
187:             */
188:            private static void writeHeadersTo(MimeMessage message,
189:                    OutputStream headerOs, String[] ignoreList)
190:                    throws MessagingException {
191:                //Write the headers (minus ignored ones)
192:                Enumeration headers = message
193:                        .getNonMatchingHeaderLines(ignoreList);
194:                writeHeadersTo(headers, headerOs);
195:            }
196:
197:            /**
198:             * Write the message headers to the given outputstream
199:             * 
200:             * @param message
201:             * @param headerOs
202:             * @param ignoreList
203:             * @throws MessagingException
204:             */
205:            public static void writeHeadersTo(Enumeration headers,
206:                    OutputStream headerOs) throws MessagingException {
207:                PrintWriter hos = new InternetPrintWriter(new BufferedWriter(
208:                        new OutputStreamWriter(headerOs), 512), true);
209:                while (headers.hasMoreElements()) {
210:                    hos.println((String) headers.nextElement());
211:                }
212:                // Print header/data separator
213:                hos.println();
214:                hos.flush();
215:            }
216:
217:            /**
218:             * @param message
219:             * @param ignoreList
220:             * @return
221:             * @throws MessagingException
222:             */
223:            public static InputStream getHeadersInputStream(
224:                    MimeMessage message, String[] ignoreList)
225:                    throws MessagingException {
226:                ByteArrayOutputStream bo = new ByteArrayOutputStream();
227:                writeHeadersTo(message, bo, ignoreList);
228:                return new ByteArrayInputStream(bo.toByteArray());
229:            }
230:
231:            /**
232:             * Slow method to calculate the exact size of a message!
233:             */
234:            private static final class SizeCalculatorOutputStream extends
235:                    OutputStream {
236:                long size = 0;
237:
238:                public void write(int arg0) throws IOException {
239:                    size++;
240:                }
241:
242:                public long getSize() {
243:                    return size;
244:                }
245:
246:                public void write(byte[] arg0, int arg1, int arg2)
247:                        throws IOException {
248:                    size += arg2;
249:                }
250:
251:                public void write(byte[] arg0) throws IOException {
252:                    size += arg0.length;
253:                }
254:            }
255:
256:            /**
257:             * @return size of full message including headers
258:             * 
259:             * @throws MessagingException if a problem occours while computing the message size
260:             */
261:            public static long getMessageSize(MimeMessage message)
262:                    throws MessagingException {
263:                //If we have a MimeMessageWrapper, then we can ask it for just the
264:                //  message size and skip calculating it
265:                long size = -1;
266:
267:                if (message instanceof  MimeMessageWrapper) {
268:                    MimeMessageWrapper wrapper = (MimeMessageWrapper) message;
269:                    size = wrapper.getMessageSize();
270:                } else if (message instanceof  MimeMessageCopyOnWriteProxy) {
271:                    MimeMessageCopyOnWriteProxy wrapper = (MimeMessageCopyOnWriteProxy) message;
272:                    size = wrapper.getMessageSize();
273:                }
274:
275:                if (size == -1) {
276:                    size = calculateMessageSize(message);
277:                }
278:
279:                return size;
280:            }
281:
282:            /**
283:             * @param message
284:             * @return the calculated size
285:             * @throws MessagingException
286:             */
287:            public static long calculateMessageSize(MimeMessage message)
288:                    throws MessagingException {
289:                long size;
290:                //SK: Should probably eventually store this as a locally
291:                //  maintained value (so we don't have to load and reparse
292:                //  messages each time).
293:                size = message.getSize();
294:                if (size != -1) {
295:                    Enumeration e = message.getAllHeaderLines();
296:                    if (e.hasMoreElements()) {
297:                        size += 2;
298:                    }
299:                    while (e.hasMoreElements()) {
300:                        // add 2 bytes for the CRLF
301:                        size += ((String) e.nextElement()).length() + 2;
302:                    }
303:                }
304:
305:                if (size == -1) {
306:                    SizeCalculatorOutputStream out = new SizeCalculatorOutputStream();
307:                    try {
308:                        message.writeTo(out);
309:                    } catch (IOException e) {
310:                        // should never happen as SizeCalculator does not actually throw IOExceptions.
311:                        throw new MessagingException(
312:                                "IOException wrapped by getMessageSize", e);
313:                    }
314:                    size = out.getSize();
315:                }
316:                return size;
317:            }
318:
319:        }
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