/*

 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.

 *

 * This code is free software; you can redistribute it and/or modify it

 * under the terms of the GNU General Public License version 2 only, as

 * published by the Free Software Foundation.  Oracle designates this

 * particular file as subject to the "Classpath" exception as provided

 * by Oracle in the LICENSE file that accompanied this code.

 *

 * This code 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

 * version 2 for more details (a copy is included in the LICENSE file that

 * accompanied this code).

 *

 * You should have received a copy of the GNU General Public License version

 * 2 along with this work; if not, write to the Free Software Foundation,

 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.

 *

 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA

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 */

/*

 * @(#)MimePartDataSource.java        1.9 02/03/27

 */

package com.sun.xml.internal.messaging.saaj.packaging.mime.internet;

import java.io.*;

import java.net.UnknownServiceException;

import javax.activation.DataSource;

import com.sun.xml.internal.messaging.saaj.packaging.mime.MessagingException;

/**

 * A utility class that implements a DataSource out of

 * a MimeBodyPart. This class is primarily meant for service providers.

 *

 * @author      John Mani

 */

public final class MimePartDataSource implements DataSource {

    private final MimeBodyPart part;

    /**

     * Constructor, that constructs a DataSource from a MimeBodyPart.

     */

    public MimePartDataSource(MimeBodyPart part) {

        this.part = part;

    }

    /**

     * Returns an input stream from this  MimeBodyPart. <p>

     *

     * This method applies the appropriate transfer-decoding, based

     * on the Content-Transfer-Encoding attribute of this MimeBodyPart.

     * Thus the returned input stream is a decoded stream of bytes.<p>

     *

     * This implementation obtains the raw content from the MimeBodyPart

     * 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 = part.getContentStream();

            String encoding = 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.

     */

        throw new UnknownServiceException();

    }

    /**

     * Returns the content-type of this DataSource. <p>

     *

     * This implementation just invokes the <code>getContentType</code>

     * method on the MimeBodyPart.

     */

    public String getContentType() {

        return part.getContentType();

    }

    /**

     * DataSource method to return a name.  <p>

     *

     * This implementation just returns an empty string.

     */

        try {

                return part.getFileName();

        } catch (MessagingException mex) {

        return "";

        }

    }

}