/*

 *   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.daemon;

import java.nio.ByteBuffer;

import java.nio.CharBuffer;

import java.nio.channels.ClosedChannelException;

import java.nio.charset.Charset;

import java.nio.charset.CharsetEncoder;

import java.nio.charset.CoderResult;

/**

 * Encodes a line to buffers using the correct charset.

 * @author Christian Lins

 * @since sonews/0.5.0

 */

class LineEncoder

{

  private CharBuffer    characters;

  private Charset       charset;

  /**

   * Constructs new LineEncoder.

   * @param characters

   * @param charset

   */

  public LineEncoder(CharBuffer characters, Charset charset)

  {

    this.characters = characters;

    this.charset    = charset;

  }

  /**

   * Encodes the characters of this instance to the given ChannelLineBuffers

   * using the Charset of this instance.

   * @param buffer

   * @throws java.nio.channels.ClosedChannelException

   */

  public void encode(ChannelLineBuffers buffer)

    throws ClosedChannelException

  {

    CharsetEncoder encoder = charset.newEncoder();

    while (characters.hasRemaining())

    {

      ByteBuffer buf = ChannelLineBuffers.newLineBuffer();

      assert buf.position() == 0;

      assert buf.capacity() >= 512;

      CoderResult res = encoder.encode(characters, buf, true);

      // Set limit to current position and current position to 0;

      // means make ready for read from buffer

      buf.flip();

      buffer.addOutputBuffer(buf);

      if (res.isUnderflow()) // All input processed

      {

        break;

      }

    }

  }

}