1 /*
   2  * Copyright (c) 1997, 2010, Oracle and/or its affiliates. All rights reserved.
   3  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
   4  *
   5  * This code is free software; you can redistribute it and/or modify it
   6  * under the terms of the GNU General Public License version 2 only, as
   7  * published by the Free Software Foundation.  Oracle designates this
   8  * particular file as subject to the "Classpath" exception as provided
   9  * by Oracle in the LICENSE file that accompanied this code.
  10  *
  11  * This code is distributed in the hope that it will be useful, but WITHOUT
  12  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  13  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
  14  * version 2 for more details (a copy is included in the LICENSE file that
  15  * accompanied this code).
  16  *
  17  * You should have received a copy of the GNU General Public License version
  18  * 2 along with this work; if not, write to the Free Software Foundation,
  19  * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
  20  *
  21  * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
  22  * or visit www.oracle.com if you need additional information or have any
  23  * questions.
  24  */
  25 
  26 /*
  27  * @(#)MimePartDataSource.java        1.9 02/03/27
  28  */
  29 
  30 
  31 
  32 package com.sun.xml.internal.messaging.saaj.packaging.mime.internet;
  33 
  34 import java.io.*;
  35 import java.net.UnknownServiceException;
  36 
  37 import javax.activation.DataSource;
  38 
  39 import com.sun.xml.internal.messaging.saaj.packaging.mime.MessagingException;
  40 
  41 /**
  42  * A utility class that implements a DataSource out of
  43  * a MimeBodyPart. This class is primarily meant for service providers.
  44  *
  45  * @author      John Mani
  46  */
  47 
  48 public final class MimePartDataSource implements DataSource {
  49     private final MimeBodyPart part;
  50 
  51     /**
  52      * Constructor, that constructs a DataSource from a MimeBodyPart.
  53      */
  54     public MimePartDataSource(MimeBodyPart part) {
  55         this.part = part;
  56     }
  57 
  58     /**
  59      * Returns an input stream from this  MimeBodyPart. <p>
  60      *
  61      * This method applies the appropriate transfer-decoding, based
  62      * on the Content-Transfer-Encoding attribute of this MimeBodyPart.
  63      * Thus the returned input stream is a decoded stream of bytes.<p>
  64      *
  65      * This implementation obtains the raw content from the MimeBodyPart
  66      * using the <code>getContentStream()</code> method and decodes
  67      * it using the <code>MimeUtility.decode()</code> method.
  68      *
  69      * @return  decoded input stream
  70      */
  71     public InputStream getInputStream() throws IOException {
  72 
  73         try {
  74         InputStream is = part.getContentStream();
  75 
  76             String encoding = part.getEncoding();
  77             if (encoding != null)
  78                 return MimeUtility.decode(is, encoding);
  79             else
  80                 return is;
  81         } catch (MessagingException mex) {
  82             throw new IOException(mex.getMessage());
  83         }
  84     }
  85 
  86     /**
  87      * DataSource method to return an output stream. <p>
  88      *
  89      * This implementation throws the UnknownServiceException.
  90      */
  91     public OutputStream getOutputStream() throws IOException {
  92         throw new UnknownServiceException();
  93     }
  94 
  95     /**
  96      * Returns the content-type of this DataSource. <p>
  97      *
  98      * This implementation just invokes the <code>getContentType</code>
  99      * method on the MimeBodyPart.
 100      */
 101     public String getContentType() {
 102         return part.getContentType();
 103     }
 104 
 105     /**
 106      * DataSource method to return a name.  <p>
 107      *
 108      * This implementation just returns an empty string.
 109      */
 110     public String getName() {
 111         try {
 112                 return part.getFileName();
 113         } catch (MessagingException mex) {
 114         return "";
 115         }
 116     }
 117 }