bytesmessage.java

来自「一个类似于openJMS分布在ObjectWeb之下的JMS消息中间件。」· Java 代码 · 共 715 行 · 第 1/2 页

    }
    catch (Exception e) {
      JMSException jE = null;
      if (e instanceof EOFException)
        jE = new MessageEOFException("Unexpected end of bytes array.");
      else if (e instanceof IOException)
        jE = new JMSException("Could not read the bytes array.");
      jE.setLinkedException(e);
      throw jE;
    }
  }

  /**
   * API method.
   *
   * @exception MessageNotReadableException  If the message body is write-only.
   * @exception JMSException  If an exception occurs while reading the bytes.
   */
  public int readUnsignedByte() throws JMSException
  {
    if (WObody)
      throw new MessageNotReadableException("Can't read the message body as"
                                            + " it is write-only.");
    try {
      return inputStream.readUnsignedByte();
    }
    catch (Exception e) {
      JMSException jE = null;
      if (e instanceof EOFException)
        jE = new MessageEOFException("Unexpected end of bytes array.");
      else if (e instanceof IOException)
        jE = new JMSException("Could not read the bytes array.");
      jE.setLinkedException(e);
      throw jE;
    }
  }

  /**
   * API method.
   *
   * @exception MessageNotReadableException  If the message body is write-only.
   * @exception JMSException  If an exception occurs while reading the bytes.
   */
  public short readShort() throws JMSException
  {
    if (WObody)
      throw new MessageNotReadableException("Can't read the message body as"
                                            + " it is write-only.");
    try {
      return inputStream.readShort();
    }
    catch (Exception e) {
      JMSException jE = null;
      if (e instanceof EOFException)
        jE = new MessageEOFException("Unexpected end of bytes array.");
      else if (e instanceof IOException)
        jE = new JMSException("Could not read the bytes array.");
      jE.setLinkedException(e);
      throw jE;
    }
  }
  
  /**
   * API method.
   *
   * @exception MessageNotReadableException  If the message body is write-only.
   * @exception JMSException  If an exception occurs while reading the bytes.
   */
  public int readUnsignedShort() throws JMSException
  {
    if (WObody)
      throw new MessageNotReadableException("Can't read the message body as"
                                            + " it is write-only.");
    try {
      return inputStream.readUnsignedShort();
    }
    catch (Exception e) {
      JMSException jE = null;
      if (e instanceof EOFException)
        jE = new MessageEOFException("Unexpected end of bytes array.");
      else if (e instanceof IOException)
        jE = new JMSException("Could not read the bytes array.");
      jE.setLinkedException(e);
      throw jE;
    }
  }

  /**
   * API method.
   *
   * @exception MessageNotReadableException  If the message body is write-only.
   * @exception JMSException  If an exception occurs while reading the bytes.
   */
  public char readChar() throws JMSException
  {
    if (WObody)
      throw new MessageNotReadableException("Can't read the message body as"
                                            + " it is write-only.");
    try {
      return inputStream.readChar();
    }
    catch (Exception e) {
      JMSException jE = null;
      if (e instanceof EOFException)
        jE = new MessageEOFException("Unexpected end of bytes array.");
      else if (e instanceof IOException)
        jE = new JMSException("Could not read the bytes array.");
      jE.setLinkedException(e);
      throw jE;
    }
  }

  /**
   * API method.
   *
   * @exception MessageNotReadableException  If the message body is write-only.
   * @exception JMSException  If an exception occurs while reading the bytes.
   */
  public int readInt() throws JMSException
  {
    if (WObody)
      throw new MessageNotReadableException("Can't read the message body as"
                                            + " it is write-only.");
    try {
      return inputStream.readInt();
    }
    catch (Exception e) {
      JMSException jE = null;
      if (e instanceof EOFException)
        jE = new MessageEOFException("Unexpected end of bytes array.");
      else if (e instanceof IOException)
        jE = new JMSException("Could not read the bytes array.");
      jE.setLinkedException(e);
      throw jE;
    }
  }

  /**
   * API method.
   *
   * @exception MessageNotReadableException  If the message body is write-only.
   * @exception JMSException  If an exception occurs while reading the bytes.
   */
  public long readLong() throws JMSException
  {
    if (WObody)
      throw new MessageNotReadableException("Can't read the message body as"
                                            + " it is write-only.");
    try {
      return inputStream.readLong();
    }
    catch (Exception e) {
      JMSException jE = null;
      if (e instanceof EOFException)
        jE = new MessageEOFException("Unexpected end of bytes array.");
      else if (e instanceof IOException)
        jE = new JMSException("Could not read the bytes array.");
      jE.setLinkedException(e);
      throw jE;
    }
  }

  /**
   * API method.
   *
   * @exception MessageNotReadableException  If the message body is write-only.
   * @exception JMSException  If an exception occurs while reading the bytes.
   */
//    public float readFloat() throws JMSException
//    {
//      if (WObody)
//        throw new MessageNotReadableException("Can't read the message body as"
//                                              + " it is write-only.");
//      try {
//        return inputStream.readFloat();
//      }
//      catch (Exception e) {
//        JMSException jE = null;
//        if (e instanceof EOFException)
//          jE = new MessageEOFException("Unexpected end of bytes array.");
//        else if (e instanceof IOException)
//          jE = new JMSException("Could not read the bytes array.");
//        jE.setLinkedException(e);
//        throw jE;
//      }
//    }

  /**
   * API method.
   *
   * @exception MessageNotReadableException  If the message body is write-only.
   * @exception JMSException  If an exception occurs while reading the bytes.
   */
//    public double readDouble() throws JMSException
//    {
//      if (WObody)
//        throw new MessageNotReadableException("Can't read the message body as"
//                                              + " it is write-only.");
//      try {
//        return inputStream.readDouble();
//      }
//      catch (Exception e) {
//        JMSException jE = null;
//        if (e instanceof EOFException)
//          jE = new MessageEOFException("Unexpected end of bytes array.");
//        else if (e instanceof IOException)
//          jE = new JMSException("Could not read the bytes array.");
//        jE.setLinkedException(e);
//        throw jE;
//      }
//    }

  /**
   * API method.
   *
   * @exception MessageNotReadableException  If the message body is write-only.
   * @exception JMSException  If an exception occurs while reading the bytes.
   */
  public int readBytes(byte[] value) throws JMSException
  {
    if (WObody)
      throw new MessageNotReadableException("Can't read the message body as"
                                            + " it is write-only.");
    int counter = 0;

    try {
      for (int i = 0; i < value.length; i ++) {
        value[i] = inputStream.readByte();
        counter++;
      }
    }
    // End of array has been reached:
    catch (EOFException eofE) {}
    // An error has occured!
    catch (IOException ioE) {
      JMSException jE = null;
      jE = new JMSException("Could not read the bytes array.");
      jE.setLinkedException(ioE);
      throw jE;
    }
    if (counter == 0)
      return -1;
    return counter;
  }

  /**
   * API method.
   *
   * @exception MessageNotReadableException  If the message body is write-only.
   * @exception JMSException  If an exception occurs while reading the bytes.
   */
  public int readBytes(byte[] value, int length) throws JMSException
  {
    if (WObody)
      throw new MessageNotReadableException("Can't read the message body as"
                                            + " it is write-only.");
    if (length > value.length || length < 0)
      throw new IndexOutOfBoundsException("Invalid length parameter: "
                                          + length);
    int counter = 0;

    try {
      for (int i = 0; i < length; i ++) {
        value[i] = inputStream.readByte();
        counter++;
      }
    }
    // End of array has been reached:
    catch (EOFException eofE) {}
    // An error has occured!
    catch (IOException ioE) {
      JMSException jE = null;
      jE = new JMSException("Could not read the bytes array.");
      jE.setLinkedException(ioE);
      throw jE;
    }
    if (counter == 0)
      return -1;
    return counter;
  }

  /**
   * API method.
   *
   * @exception MessageNotReadableException  If the message body is write-only.
   * @exception JMSException  If an exception occurs while reading the bytes.
   */
  public String readUTF() throws JMSException
  {
    if (WObody)
      throw new MessageNotReadableException("Can't read the message body as"
                                            + " it is write-only.");
    try {
      return inputStream.readUTF();
    }
    catch (Exception e) {
      JMSException jE = null;
      if (e instanceof EOFException)
        jE = new MessageEOFException("Unexpected end of bytes array.");
      else if (e instanceof IOException)
        jE = new JMSException("Could not read the bytes array.");
      jE.setLinkedException(e);
      throw jE;
    }
  }

  
  /** 
   * API method.
   *
   * @exception JMSException  If an error occurs while closing the output
   *              stream.
   */
  public void reset() throws JMSException
  {
    try {
      if (WObody) {
        outputStream.flush();
        bytes = outputBuffer.toByteArray();
      }
      else
        inputStream.close();
      
      inputStream = new DataInputStream(new ByteArrayInputStream(bytes));

      RObody = true;
      WObody = false;
    }
    catch (IOException iE) {
      JMSException jE =
        new JMSException("Error while manipulating the stream facilities.");
      jE.setLinkedException(iE);
      throw jE;
    }
  }

  /**
   * Method actually preparing the message for sending by transfering the
   * local body into the wrapped MOM message.
   *
   * @exception Exception  If an error occurs while serializing.
   */
  protected void prepare() throws Exception
  {
    super.prepare();

    if (WObody) {
      outputStream.flush();
      bytes = outputBuffer.toByteArray();
      prepared = true;
    }

    momMsg.clearBody();
    momMsg.setBytes(bytes);
  } 
}