/*

 *   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;

    }

  }

}