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 */
019
020 package javax.mail.internet;
021
022 import java.io.IOException;
023 import java.io.InputStream;
024 import java.io.OutputStream;
025 import java.net.UnknownServiceException;
026 import javax.activation.DataSource;
027 import javax.mail.MessageAware;
028 import javax.mail.MessageContext;
029 import javax.mail.MessagingException;
030
031 /**
032 * @version $Rev: 689126 $ $Date: 2008-08-26 12:17:53 -0400 (Tue, 26 Aug 2008) $
033 */
034 public class MimePartDataSource implements DataSource, MessageAware {
035 // the part that provides the data form this data source.
036 protected MimePart part;
037
038 public MimePartDataSource(MimePart part) {
039 this.part = part;
040 }
041
042 public InputStream getInputStream() throws IOException {
043 try {
044 InputStream stream;
045 if (part instanceof MimeMessage) {
046 // this never gets encoded, so we can skip other steps
047 return ((MimeMessage) part).getContentStream();
048 } else if (part instanceof MimeBodyPart) {
049 stream = ((MimeBodyPart) part).getContentStream();
050 } else {
051 throw new MessagingException("Unknown part");
052 }
053 return checkPartEncoding(part, stream);
054 } catch (MessagingException e) {
055 throw (IOException) new IOException(e.getMessage()).initCause(e);
056 }
057 }
058
059
060 /**
061 * For a given part, decide it the data stream requires
062 * wrappering with a stream for decoding a particular
063 * encoding.
064 *
065 * @param part The part we're extracting.
066 * @param stream The raw input stream for the part.
067 *
068 * @return An input stream configured for reading the
069 * source part and decoding it into raw bytes.
070 */
071 private InputStream checkPartEncoding(MimePart part, InputStream stream) throws MessagingException {
072 String encoding = part.getEncoding();
073 // if nothing is specified, there's nothing to do
074 if (encoding == null) {
075 return stream;
076 }
077 // now screen out the ones that never need decoding
078 encoding = encoding.toLowerCase();
079 if (encoding.equals("7bit") || encoding.equals("8bit") || encoding.equals("binary")) {
080 return stream;
081 }
082 // now we need to check the content type to prevent
083 // MultiPart types from getting decoded, since the part is just an envelope around other
084 // parts
085 String contentType = part.getContentType();
086 if (contentType != null) {
087 try {
088 ContentType type = new ContentType(contentType);
089 // no decoding done here
090 if (type.match("multipart/*")) {
091 return stream;
092 }
093 } catch (ParseException e) {
094 // ignored....bad content type means we handle as a normal part
095 }
096 }
097 // ok, wrap this is a decoding stream if required
098 return MimeUtility.decode(stream, encoding);
099 }
100
101
102 public OutputStream getOutputStream() throws IOException {
103 throw new UnknownServiceException();
104 }
105
106 public String getContentType() {
107 try {
108 return part.getContentType();
109 } catch (MessagingException e) {
110 return null;
111 }
112 }
113
114 public String getName() {
115 return "";
116 }
117
118 public synchronized MessageContext getMessageContext() {
119 return new MessageContext(part);
120 }
121 }