//
   //  ========================================================================
   //  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.DataInfo;
  import org.eclipse.jetty.spdy.frames.DataFrame;
  import org.eclipse.jetty.util.BufferUtil;
  
  public class DataFrameGenerator
  {
      private final ByteBufferPool bufferPool;
  
      public DataFrameGenerator(ByteBufferPool bufferPool)
      {
          this.bufferPool = bufferPool;
      }
  
      public ByteBuffer generate(int streamId, int length, DataInfo dataInfo)
      {
          ByteBuffer buffer = bufferPool.acquire(DataFrame.HEADER_LENGTH + length, Generator.useDirectBuffers);
          BufferUtil.clearToFill(buffer);
          buffer.limit(length + DataFrame.HEADER_LENGTH);
          buffer.position(DataFrame.HEADER_LENGTH);
          // Guaranteed to always be >= 0
          int read = dataInfo.readInto(buffer);
  
          buffer.putInt(0, streamId & 0x7F_FF_FF_FF);
          buffer.putInt(4, read & 0x00_FF_FF_FF);
  
          byte flags = dataInfo.getFlags();
          if (dataInfo.available() > 0)
              flags &= ~DataInfo.FLAG_CLOSE;
          buffer.put(4, flags);
  
          buffer.flip();
          return buffer;
      }
  }