/*
 * Copyright (c) 1998-2012 Caucho Technology -- all rights reserved
 *
 * This file is part of Resin(R) Open Source
 *
 * Each copy or derived work must preserve the copyright notice and this
 * notice unmodified.
 *
 * Resin Open Source is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2 of the License, or
 * (at your option) any later version.
 *
 * Resin Open Source is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE, or any warranty
 * of NON-INFRINGEMENT.  See the GNU General Public License for more
 * details.
 *
 * You should have received a copy of the GNU General Public License
 * along with Resin Open Source; if not, write to the
 *
 *   Free Software Foundation, Inc.
 *   59 Temple Place, Suite 330
 *   Boston, MA 02111-1307  USA
 *
 * @author Scott Ferguson
 */

package com.caucho.amqp.marshal;

import java.io.IOException;

import javax.jms.Message;
import javax.jms.TextMessage;

import com.caucho.amqp.AmqpException;
import com.caucho.amqp.io.AmqpConstants;
import com.caucho.amqp.io.AmqpReader;
import com.caucho.jms.message.TextMessageImpl;


/**
 * Encodes a message as a string.
 */
public class AmqpJmsDecoder implements AmqpMessageDecoder<Message>
{
  public static final AmqpJmsDecoder DECODER = new AmqpJmsDecoder();
  
  @Override
  public Message decode(AmqpReader in, Message prevValue)
    throws IOException
  {
    long descriptor;
    
    while ((descriptor = in.readDescriptor()) >= 0) {
      if (descriptor == AmqpConstants.ST_MESSAGE_VALUE) {
        String value = in.readString();
        
        try {
          TextMessage txtMessage = new TextMessageImpl();
          txtMessage.setText(value);
        
          return txtMessage;
        } catch (Exception e) {
          throw new AmqpException(e);
        }
      }
      else {
        in.readObject(descriptor);
      }
    }
    
    return null;
  }
}
