//
   //  ========================================================================
   //  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.OnMessage;
  
  import org.eclipse.jetty.websocket.common.message.MessageAppender;
  import org.eclipse.jetty.websocket.common.util.Utf8PartialBuilder;
  import org.eclipse.jetty.websocket.jsr356.endpoints.JsrAnnotatedEventDriver;
  
  /**
   * Partial TEXT MessageAppender for @{@link OnMessage} annotated methods
   */
  public class TextPartialOnMessage implements MessageAppender
  {
      private final JsrAnnotatedEventDriver driver;
      private final Utf8PartialBuilder utf8Partial;
      private boolean finished;
  
      public TextPartialOnMessage(JsrAnnotatedEventDriver driver)
      {
          this.driver = driver;
          this.finished = false;
          this.utf8Partial = new Utf8PartialBuilder();
      }
  
      @Override
      public void appendFrame(ByteBuffer payload, boolean isLast) throws IOException
      {
          if (finished)
          {
              throw new IOException("Cannot append to finished buffer");
          }
          
          String text = utf8Partial.toPartialString(payload);
          driver.onPartialTextMessage(text,isLast);
      }
  
      @Override
      public void messageComplete()
      {
          finished = true;
      }
  }