@Override
  public ActiveMQMessage convertFrame(ProtocolConverter converter, StompFrame command)
      throws JMSException, ProtocolException {
    Map<String, String> headers = command.getHeaders();
    ActiveMQMessage msg;
    String transformation = headers.get(Headers.TRANSFORMATION);
    if (headers.containsKey(Headers.CONTENT_LENGTH)
        || transformation.equals(Transformations.JMS_BYTE.toString())) {
      msg = super.convertFrame(converter, command);
    } else {
      HierarchicalStreamReader in;

      try {
        String text = new String(command.getContent(), "UTF-8");
        switch (Transformations.getValue(transformation)) {
          case JMS_OBJECT_XML:
            in = new XppReader(new StringReader(text), XppFactory.createDefaultParser());
            msg = createObjectMessage(in);
            break;
          case JMS_OBJECT_JSON:
            in = new JettisonMappedXmlDriver().createReader(new StringReader(text));
            msg = createObjectMessage(in);
            break;
          case JMS_MAP_XML:
            in = new XppReader(new StringReader(text), XppFactory.createDefaultParser());
            msg = createMapMessage(in);
            break;
          case JMS_MAP_JSON:
            in = new JettisonMappedXmlDriver().createReader(new StringReader(text));
            msg = createMapMessage(in);
            break;
          default:
            throw new Exception("Unkown transformation: " + transformation);
        }
      } catch (Throwable e) {
        command.getHeaders().put(Headers.TRANSFORMATION_ERROR, e.getMessage());
        msg = super.convertFrame(converter, command);
      }
    }

    copyStandardHeadersFromFrameToMessage(converter, command, msg, this);
    return msg;
  }