//
   //  ========================================================================
   //  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.websocket.jsr356.messages;
  
  import java.io.IOException;
  import java.nio.ByteBuffer;
  
  import javax.websocket.MessageHandler;
  import javax.websocket.MessageHandler.Partial;
  
  import org.eclipse.jetty.util.BufferUtil;
  import org.eclipse.jetty.websocket.common.message.MessageAppender;
  import org.eclipse.jetty.websocket.jsr356.MessageHandlerWrapper;
  
  /**
   * Partial BINARY MessageAppender for MessageHandler.Partial interface
   */
  public class BinaryPartialMessage implements MessageAppender
  {
      private final MessageHandlerWrapper msgWrapper;
      private final MessageHandler.Partial<Object> partialHandler;
  
      @SuppressWarnings("unchecked")
      public BinaryPartialMessage(MessageHandlerWrapper wrapper)
      {
          this.msgWrapper = wrapper;
          this.partialHandler = (Partial<Object>)wrapper.getHandler();
      }
  
      @Override
      public void appendFrame(ByteBuffer payload, boolean isLast) throws IOException
      {
          // No decoders for Partial messages per JSR-356 (PFD1 spec)
  
          // Supported Partial<> Type #1: ByteBuffer
          if (msgWrapper.isMessageType(ByteBuffer.class))
          {
              partialHandler.onMessage(payload.slice(),isLast);
              return;
          }
  
          // Supported Partial<> Type #2: byte[]
          if (msgWrapper.isMessageType(byte[].class))
          {
              partialHandler.onMessage(BufferUtil.toArray(payload),isLast);
              return;
          }
  
          StringBuilder err = new StringBuilder();
          err.append(msgWrapper.getHandler().getClass());
          err.append(" does not implement an expected ");
          err.append(MessageHandler.Partial.class.getName());
          err.append(" of type ");
          err.append(ByteBuffer.class.getName());
          err.append(" or byte[]");
          throw new IllegalStateException(err.toString());
      }
  
      @Override
      public void messageComplete()
      {
          /* nothing to do here */
      }
  }