//
   //  ========================================================================
   //  Copyright (c) 1995-2013 Mort Bay Consulting Pty. Ltd.
   //  ------------------------------------------------------------------------
   //  All rights reserved. This program and the accompanying materials
   //  are made available under the terms of the Eclipse Public License v1.0
   //  and Apache License v2.0 which accompanies this distribution.
   //
   //      The Eclipse Public License is available at
  //      http://www.eclipse.org/legal/epl-v10.html
  //
  //      The Apache License v2.0 is available at
  //      http://www.opensource.org/licenses/apache2.0.php
  //
  //  You may elect to redistribute this code under either of these licenses.
  //  ========================================================================
  //
  
  package org.eclipse.jetty.spdy.generator;
  
  import java.nio.ByteBuffer;
  
  import org.eclipse.jetty.io.ByteBufferPool;
  import org.eclipse.jetty.spdy.api.SPDY;
  import org.eclipse.jetty.spdy.frames.ControlFrame;
  import org.eclipse.jetty.spdy.frames.GoAwayFrame;
  import org.eclipse.jetty.util.BufferUtil;
  
  public class GoAwayGenerator extends ControlFrameGenerator
  {
      public GoAwayGenerator(ByteBufferPool bufferPool)
      {
          super(bufferPool);
      }
  
      @Override
      public ByteBuffer generate(ControlFrame frame)
      {
          GoAwayFrame goAway = (GoAwayFrame)frame;
  
          int frameBodyLength = 8;
          int totalLength = ControlFrame.HEADER_LENGTH + frameBodyLength;
          ByteBuffer buffer = getByteBufferPool().acquire(totalLength, Generator.useDirectBuffers);
          BufferUtil.clearToFill(buffer);
          generateControlFrameHeader(goAway, frameBodyLength, buffer);
  
          buffer.putInt(goAway.getLastStreamId() & 0x7F_FF_FF_FF);
          writeStatusCode(goAway, buffer);
  
          buffer.flip();
          return buffer;
      }
  
      private void writeStatusCode(GoAwayFrame goAway, ByteBuffer buffer)
      {
          switch (goAway.getVersion())
          {
              case SPDY.V2:
                  break;
              case SPDY.V3:
                  buffer.putInt(goAway.getStatusCode());
                  break;
              default:
                  throw new IllegalStateException();
          }
      }
  }