//
   //  ========================================================================
   //  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.websocket.common.message;
  
  import java.io.ByteArrayOutputStream;
  import java.io.IOException;
  import java.nio.ByteBuffer;
  
  import org.eclipse.jetty.util.BufferUtil;
  import org.eclipse.jetty.websocket.common.events.EventDriver;
  
  public class SimpleBinaryMessage implements MessageAppender
  {
      private static final int BUFFER_SIZE = 65535;
      private final EventDriver onEvent;
      private final ByteArrayOutputStream out;
      private int size;
      private boolean finished;
  
      public SimpleBinaryMessage(EventDriver onEvent)
      {
          this.onEvent = onEvent;
          this.out = new ByteArrayOutputStream(BUFFER_SIZE);
          finished = false;
      }
  
      @Override
      public void appendMessage(ByteBuffer payload) throws IOException
      {
          if (finished)
          {
              throw new IOException("Cannot append to finished buffer");
          }
  
          if (payload == null)
          {
              // empty payload is valid
              return;
          }
  
          onEvent.getPolicy().assertValidMessageSize(size + payload.remaining());
          size += payload.remaining();
  
          BufferUtil.writeTo(payload,out);
      }
  
      @Override
      public void messageComplete()
      {
          finished = true;
          byte data[] = out.toByteArray();
          onEvent.onBinaryMessage(data);
      }
  }