code: public void readData(DataInput din) throws IOException {
          reference = din.readUnsignedShort();
          andMask = din.readUnsignedShort();
          orMask = din.readUnsignedShort();
      }
docs: readData -- dummy function.  There is no data with the request.
  @throws java.io.IOException If the data cannot be read from the socket/port