/*
 * Copyright (c) 1998-2011 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; within 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 SoftwareFoundation, Inc.
 *   59 Temple Place, Suite 330
 *   Boston, MA 02111-1307  USA
 *
 * @author Emil Ong
 */

package com.caucho.jms.util;

import javax.jms.BytesMessage;
import javax.jms.JMSException;
import java.io.IOException;
import java.io.InputStream;
import java.util.logging.Logger;

/**
 * An input stream that reads from a BytesMessage.
 */
public class BytesMessageInputStream extends InputStream 
{
  protected static Logger log
    = Logger.getLogger(BytesMessageInputStream.class.getName());

  private BytesMessage _message;

  public BytesMessageInputStream(BytesMessage message)
  {
    _message = message;
  }

  public int read()
    throws IOException
  {
    try {
      return _message.readByte();
    } catch (JMSException e) {
      throw new IOException(e.toString());
    }
  }

  public int read(byte[] buffer, int offset, int length) 
    throws IOException
  {
    try {
      if (offset == 0)
        return _message.readBytes(buffer, length);
      else
        return super.read(buffer, offset, length);
    } catch (JMSException e) {
      throw new IOException(e.toString());
    }
  }

  public int read(byte[] buffer)
    throws IOException
  {
    try {
      return _message.readBytes(buffer);
    } catch (JMSException e) {
      throw new IOException(e.toString());
    }
  }
}