//
   //  ========================================================================
   //  Copyright (c) 1995-2016 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.http2.generator;
  
  import java.nio.ByteBuffer;
  
  import org.eclipse.jetty.http2.Flags;
  import org.eclipse.jetty.http2.frames.Frame;
  import org.eclipse.jetty.http2.frames.FrameType;
  import org.eclipse.jetty.http2.frames.WindowUpdateFrame;
  import org.eclipse.jetty.io.ByteBufferPool;
  import org.eclipse.jetty.util.BufferUtil;
  
  public class WindowUpdateGenerator extends FrameGenerator
  {
      public WindowUpdateGenerator(HeaderGenerator headerGenerator)
      {
          super(headerGenerator);
      }
  
      @Override
      public void generate(ByteBufferPool.Lease lease, Frame frame)
      {
          WindowUpdateFrame windowUpdateFrame = (WindowUpdateFrame)frame;
          generateWindowUpdate(lease, windowUpdateFrame.getStreamId(), windowUpdateFrame.getWindowDelta());
      }
  
      public void generateWindowUpdate(ByteBufferPool.Lease lease, int streamId, int windowUpdate)
      {
          if (windowUpdate < 0)
              throw new IllegalArgumentException("Invalid window update: " + windowUpdate);
  
          ByteBuffer header = generateHeader(lease, FrameType.WINDOW_UPDATE, 4, Flags.NONE, streamId);
          header.putInt(windowUpdate);
          BufferUtil.flipToFlush(header, 0);
          lease.append(header, true);
      }
  }