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/*
* MimePartDataSource.java
* Copyright (C) 2002 The Free Software Foundation
*
* This file is part of GNU JavaMail, a library.
*
* GNU JavaMail is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* GNU JavaMail is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this library; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*
* As a special exception, if you link this library with other files to
* produce an executable, this library does not by itself cause the
* resulting executable to be covered by the GNU General Public License.
* This exception does not however invalidate any other reasons why the
* executable file might be covered by the GNU General Public License.
*/
package javax.mail.internet;
import java.io.InputStream;
import java.io.IOException;
import java.io.OutputStream;
import java.net.UnknownServiceException;
import javax.activation.DataSource;
import javax.mail.MessageAware;
import javax.mail.MessageContext;
import javax.mail.MessagingException;
/**
* A utility class that implements a DataSource out of a MimePart.
* This class is primarily meant for service providers.
*
* @author <a href="mailto:dog@gnu.org">Chris Burdess</a>
* @version 1.3
*/
public class MimePartDataSource
implements DataSource, MessageAware
{
/*
* The part.
*/
private MimePart part;
/*
* Manages a MessageContext on behalf of the part.
* @see #getMessageContext
*/
private MessageContext context;
/**
* Constructor, that constructs a DataSource from a MimePart.
*/
public MimePartDataSource(MimePart part)
{
this.part = part;
}
/**
* Returns an input stream from this MimePart.
* <p>
* This method applies the appropriate transfer-decoding, based on the
* Content-Transfer-Encoding attribute of this MimePart. Thus the returned
* input stream is a decoded stream of bytes.
* <p>
* This implementation obtains the raw content from the Part using the
* <code>getContentStream()</code> method and decodes it using the
* <code>MimeUtility.decode()</code> method.
* @return decoded input stream
*/
public InputStream getInputStream()
throws IOException
{
try
{
InputStream is;
if (part instanceof MimeBodyPart)
is = ((MimeBodyPart)part).getContentStream();
else if (part instanceof MimeMessage)
is = ((MimeMessage)part).getContentStream();
else
throw new MessagingException("Unknown part type");
String encoding = part.getEncoding();
return (encoding!=null) ? MimeUtility.decode(is, encoding) : is;
}
catch (MessagingException e)
{
throw new IOException(e.getMessage());
}
}
/**
* DataSource method to return an output stream.
* <p>
* This implementation throws the UnknownServiceException.
*/
public OutputStream getOutputStream()
throws IOException
{
throw new UnknownServiceException();
}
/**
* Returns the content-type of this DataSource.
* <p>
* This implementation just invokes the getContentType method on the
* MimePart.
*/
public String getContentType()
{
try
{
return part.getContentType();
}
catch (MessagingException e)
{
return null;
}
}
/**
* DataSource method to return a name.
* <p>
* This implementation just returns an empty string.
*/
public String getName()
{
// Shouldn't this return the filename parameter of the
// Content-Disposition of a MimeBodyPart, if available?
return "";
}
/**
* Return the MessageContext for the current part.
*/
public MessageContext getMessageContext()
{
if (context==null)
context = new MessageContext(part);
return context;
}
}
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