/*
    * Copyright (c) 2012 the original author or authors.
    *
    * Licensed under the Apache License, Version 2.0 (the "License");
    * you may not use this file except in compliance with the License.
    * You may obtain a copy of the License at
    *
    *     http://www.apache.org/licenses/LICENSE-2.0
    *
   * Unless required by applicable law or agreed to in writing, software
   * distributed under the License is distributed on an "AS IS" BASIS,
   * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
   * See the License for the specific language governing permissions and
   * limitations under the License.
   */
  
  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);
      }
  }