Metacat

/**

 *  Copyright: 2010 Regents of the University of California and the

 *              National Center for Ecological Analysis and Synthesis

 *

 * This program 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.

 *

 * This program 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 program; if not, write to the Free Software

 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA

 */

package edu.ucsb.nceas.metacat.restservice;

import java.io.IOException;

import java.io.InputStream;

import java.io.OutputStream;

import javax.activation.DataSource;

/**

 * Encapsulate an InputStream within a DataSource interface so that it is 

 * accessible to MIME processors.

 * 

 * @author Matthew Jones

 */

public class InputStreamDataSource implements DataSource {

    private String name;

    private InputStream stream;

    private boolean readOnce;

    public InputStreamDataSource(String name, InputStream stream) {

        super();

        this.name = name;

        this.stream = stream;

        this.readOnce = false;

    }

    public String getContentType() {

        return "application/octet-stream";

    }

    public InputStream getInputStream() throws IOException {

        if (readOnce) {

            throw new IOException("Only call getInputStream() once.");

        }

        readOnce = true;

        return stream;

    }

    public String getName() {

        return this.name;

    }

    public OutputStream getOutputStream() throws IOException {

        throw new IOException("Can't get an OutputStream from an InputStreamDataSource.");

    }

}