/*

 *   SONEWS News Server

 *   see AUTHORS for the list of contributors

 *

 *   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 3 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, see <http://www.gnu.org/licenses/>.

 */

package org.sonews.util.io;

import java.io.ByteArrayOutputStream;

import java.io.IOException;

import java.io.InputStream;

import java.io.UnsupportedEncodingException;

import org.sonews.storage.Article;

/**

 * Capsulates an Article to provide a raw InputStream.

 * @author Christian Lins

 * @since sonews/0.5.0

 */

public class ArticleInputStream extends InputStream {

	private byte[] buf;

	private int pos = 0;

	public ArticleInputStream(final Article art)

			throws IOException, UnsupportedEncodingException {

		final ByteArrayOutputStream out = new ByteArrayOutputStream();

		out.write(art.getHeaderSource().getBytes("UTF-8"));

		out.write("\r\n\r\n".getBytes());

		out.write(art.getBody()); // Without CRLF

		out.flush();

		this.buf = out.toByteArray();

	}

	/**

	 * This method reads one byte from the stream.  The <code>pos</code>

	 * counter is advanced to the next byte to be read.  The byte read is

	 * returned as an int in the range of 0-255.  If the stream position

	 * is already at the end of the buffer, no byte is read and a -1 is

	 * returned in order to indicate the end of the stream.

	 *

	 * @return The byte read, or -1 if end of stream

	 */

	@Override

	public synchronized int read() {

		if (pos < buf.length) {

			return ((int) buf[pos++]) & 0xFF;

		} else {

			return -1;

		}

	}

}