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/*
 * Copyright (c) 1997, 2018 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 javax.mail.internet;

import javax.mail.*;
import javax.activation.*;
import java.io.*;
import java.net.UnknownServiceException;
import com.sun.mail.util.PropUtil;
import com.sun.mail.util.FolderClosedIOException;

/**
 * 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.
     *
     * @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. * * @see javax.mail.internet.MimeMessage#getContentStream * @see javax.mail.internet.MimeBodyPart#getContentStream * @see javax.mail.internet.MimeUtility#decode * @return decoded input stream */ @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 FolderClosedIOException(fex.getFolder(), fex.getMessage()); } catch (MessagingException mex) { IOException ioex = new IOException(mex.getMessage()); ioex.initCause(mex); throw ioex; } } /** * 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 ((MimeBodyPart)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; } }





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