org/sonews/daemon/LineEncoder.java
author cli
Wed Aug 12 13:03:23 2009 +0200 (2009-08-12)
changeset 7 0b76e099eb96
permissions -rw-r--r--
PullFeeder sends an addition "MODE READER" to peers.
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/*
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 *   SONEWS News Server
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 *   see AUTHORS for the list of contributors
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 *
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 *   This program is free software: you can redistribute it and/or modify
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 *   it under the terms of the GNU General Public License as published by
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 *   the Free Software Foundation, either version 3 of the License, or
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 *   (at your option) any later version.
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 *
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 *   This program is distributed in the hope that it will be useful,
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 *   but WITHOUT ANY WARRANTY; without even the implied warranty of
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 *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
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 *   GNU General Public License for more details.
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 *
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 *   You should have received a copy of the GNU General Public License
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 *   along with this program.  If not, see <http://www.gnu.org/licenses/>.
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 */
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package org.sonews.daemon;
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import java.nio.ByteBuffer;
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import java.nio.CharBuffer;
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import java.nio.channels.ClosedChannelException;
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import java.nio.charset.Charset;
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import java.nio.charset.CharsetEncoder;
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import java.nio.charset.CoderResult;
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/**
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 * Encodes a line to buffers using the correct charset.
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 * @author Christian Lins
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 * @since sonews/0.5.0
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 */
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class LineEncoder
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{
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  private CharBuffer    characters;
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  private Charset       charset;
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  /**
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   * Constructs new LineEncoder.
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   * @param characters
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   * @param charset
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   */
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  public LineEncoder(CharBuffer characters, Charset charset)
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  {
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    this.characters = characters;
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    this.charset    = charset;
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  }
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  /**
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   * Encodes the characters of this instance to the given ChannelLineBuffers
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   * using the Charset of this instance.
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   * @param buffer
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   * @throws java.nio.channels.ClosedChannelException
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   */
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  public void encode(ChannelLineBuffers buffer)
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    throws ClosedChannelException
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  {
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    CharsetEncoder encoder = charset.newEncoder();
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    while (characters.hasRemaining())
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    {
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      ByteBuffer buf = ChannelLineBuffers.newLineBuffer();
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      assert buf.position() == 0;
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      assert buf.capacity() >= 512;
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      CoderResult res = encoder.encode(characters, buf, true);
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      // Set limit to current position and current position to 0;
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      // means make ready for read from buffer
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      buf.flip();
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      buffer.addOutputBuffer(buf);
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      if (res.isUnderflow()) // All input processed
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      {
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        break;
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      }
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    }
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  }
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}