jakarta.mail.internet.MimePartDataSource Maven / Gradle / Ivy
/*
* Copyright (c) 1997, 2023 Oracle and/or its affiliates. All rights reserved.
*
* This program and the accompanying materials are made available under the
* terms of the Eclipse Public License v. 2.0, which is available at
* http://www.eclipse.org/legal/epl-2.0.
*
* This Source Code may also be made available under the following Secondary
* Licenses when the conditions for such availability set forth in the
* Eclipse Public License v. 2.0 are satisfied: GNU General Public License,
* version 2 with the GNU Classpath Exception, which is available at
* https://www.gnu.org/software/classpath/license.html.
*
* SPDX-License-Identifier: EPL-2.0 OR GPL-2.0 WITH Classpath-exception-2.0
*/
package jakarta.mail.internet;
import jakarta.activation.DataSource;
import jakarta.mail.FolderClosedException;
import jakarta.mail.MessageAware;
import jakarta.mail.MessageContext;
import jakarta.mail.MessagingException;
import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;
import java.net.UnknownServiceException;
/**
* A utility class that implements a DataSource out of
* a MimePart. This class is primarily meant for service providers.
*
* @author John Mani
* @see jakarta.mail.internet.MimePart
* @see jakarta.activation.DataSource
*/
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.
*
* @param part the MimePart
*/
public MimePartDataSource(MimePart part) {
this.part = part;
}
/**
* Returns an input stream from this MimePart.
*
* 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.
*
* This implementation obtains the raw content from the Part
* using the getContentStream() method and decodes
* it using the MimeUtility.decode() method.
*
* @return decoded input stream
* @see jakarta.mail.internet.MimeMessage#getContentStream
* @see jakarta.mail.internet.MimeBodyPart#getContentStream
* @see jakarta.mail.internet.MimeUtility#decode
*/
@Override
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 (FolderClosedException fex) {
throw new IOException(new FolderClosedException(fex.getFolder(), fex.getMessage(), fex));
} catch (MessagingException mex) {
// Cause is removed because in upper stack the cause is checked. See test POP3FolderClosedExceptionTest
throw new IOException(mex.getMessage());
}
}
/**
* DataSource method to return an output stream.
*
* This implementation throws the UnknownServiceException.
*/
@Override
public OutputStream getOutputStream() throws IOException {
throw new UnknownServiceException("Writing not supported");
}
/**
* Returns the content-type of this DataSource.
*
* This implementation just invokes the getContentType
* method on the MimePart.
*/
@Override
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.
*
* This implementation just returns an empty string.
*/
@Override
public String getName() {
try {
if (part instanceof MimeBodyPart)
return part.getFileName();
} catch (MessagingException mex) {
// ignore it
}
return "";
}
/**
* Return the MessageContext for the current part.
*
* @since JavaMail 1.1
*/
@Override
public synchronized MessageContext getMessageContext() {
if (context == null)
context = new MessageContext(part);
return context;
}
}