//========================================================================
   //Copyright 2011-2012 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.spdy.ByteBufferPool;
  import org.eclipse.jetty.spdy.frames.ControlFrame;
  
  public abstract class ControlFrameGenerator
  {
      private final ByteBufferPool bufferPool;
  
      protected ControlFrameGenerator(ByteBufferPool bufferPool)
      {
          this.bufferPool = bufferPool;
      }
  
      protected ByteBufferPool getByteBufferPool()
      {
          return bufferPool;
      }
  
      public abstract ByteBuffer generate(ControlFrame frame);
  
      protected void generateControlFrameHeader(ControlFrame frame, int frameLength, ByteBuffer buffer)
      {
          buffer.putShort((short)(0x8000 + frame.getVersion()));
          buffer.putShort(frame.getType().getCode());
          int flagsAndLength = frame.getFlags();
          flagsAndLength <<= 24;
          flagsAndLength += frameLength;
          buffer.putInt(flagsAndLength);
      }
  }