code: public boolean isSet(_Fields field) {
      if (field == null) {
        throw new IllegalArgumentException();
      }
  
      switch (field) {
      case TASK_ID:
        return is_set_taskId();
      case UPTIME:
        return is_set_uptime();
      case STATUS:
        return is_set_status();
      case HOST:
        return is_set_host();
      case PORT:
        return is_set_port();
      case ERRORS:
        return is_set_errors();
      }
      throw new IllegalStateException();
    }
docs: Returns true if field corresponding to fieldID is set (has been assigned a value) and false otherwise