/*

  *   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;

       }

     }

   }

 }