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package com.google.code.javax.mail.internet;
import com.google.code.javax.mail.*;
import javax.activation.*;
import java.io.*;
import java.net.UnknownServiceException;
import com.google.code.com.sun.mail.util.PropUtil;
/**
* A utility class that implements a DataSource out of
* a MimePart. This class is primarily meant for service providers.
*
* @see javax.mail.internet.MimePart
* @see javax.activation.DataSource
* @author John Mani
*/
public class MimePartDataSource implements DataSource, MessageAware {
/**
* The MimePart that provides the data for this DataSource.
*
* @since JavaMail 1.4
*/
protected MimePart part;
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.
*
* @see javax.mail.internet.MimeMessage#getContentStream
* @see javax.mail.internet.MimeBodyPart#getContentStream
* @see javax.mail.internet.MimeUtility#decode
* @return decoded input stream
*/
public InputStream getInputStream() throws IOException {
InputStream is;
try {
if (part instanceof MimeBodyPart)
is = ((MimeBodyPart)part).getContentStream();
else if (part instanceof MimeMessage)
is = ((MimeMessage)part).getContentStream();
else
throw new MessagingException("Unknown part");
String encoding =
MimeBodyPart.restrictEncoding(part, part.getEncoding());
if (encoding != null)
return MimeUtility.decode(is, encoding);
else
return is;
} catch (MessagingException mex) {
throw new IOException(mex.getMessage());
}
}
/**
* DataSource method to return an output stream. <p>
*
* This implementation throws the UnknownServiceException.
*/
public OutputStream getOutputStream() throws IOException {
throw new UnknownServiceException("Writing not supported");
}
/**
* Returns the content-type of this DataSource. <p>
*
* This implementation just invokes the <code>getContentType</code>
* method on the MimePart.
*/
public String getContentType() {
try {
return part.getContentType();
} catch (MessagingException mex) {
// would like to be able to reflect the exception to the
// application, but since we can't do that we return a
// generic "unknown" value here and hope for another
// exception later.
return "application/octet-stream";
}
}
/**
* DataSource method to return a name. <p>
*
* This implementation just returns an empty string.
*/
public String getName() {
try {
if (part instanceof MimeBodyPart)
return ((MimeBodyPart)part).getFileName();
} catch (MessagingException mex) {
// ignore it
}
return "";
}
/**
* Return the <code>MessageContext</code> for the current part.
* @since JavaMail 1.1
*/
public synchronized MessageContext getMessageContext() {
if (context == null)
context = new MessageContext(part);
return context;
}
}