//
   //  ========================================================================
   //  Copyright (c) 1995-2015 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 java.util.Map;
  
  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.SettingsFrame;
  import org.eclipse.jetty.io.ByteBufferPool;
  import org.eclipse.jetty.util.BufferUtil;
  
  public class SettingsGenerator extends FrameGenerator
  {
      public SettingsGenerator(HeaderGenerator headerGenerator)
      {
          super(headerGenerator);
      }
  
      @Override
      public void generate(ByteBufferPool.Lease lease, Frame frame)
      {
          SettingsFrame settingsFrame = (SettingsFrame)frame;
          generateSettings(lease, settingsFrame.getSettings(), settingsFrame.isReply());
      }
  
      public void generateSettings(ByteBufferPool.Lease lease, Map<Integer, Integer> settings, boolean reply)
      {
          // Two bytes for the identifier, four bytes for the value.
          int entryLength = 2 + 4;
          int length = entryLength * settings.size();
          if (length > getMaxFrameSize())
              throw new IllegalArgumentException("Invalid settings, too big");
  
          ByteBuffer header = generateHeader(lease, FrameType.SETTINGS, length, reply ? Flags.ACK : Flags.NONE, 0);
  
          for (Map.Entry<Integer, Integer> entry : settings.entrySet())
          {
              header.putShort(entry.getKey().shortValue());
              header.putInt(entry.getValue());
          }
  
          BufferUtil.flipToFlush(header, 0);
          lease.append(header, true);
      }
  }