public boolean isSet(_Fields field) {
    if (field == null) {
      throw new IllegalArgumentException();
    }

    switch (field) {
    case FIRST_NAME:
      return isSetFirstName();
    case LAST_NAME:
      return isSetLastName();
    case STATUS:
      return isSetStatus();
    case ID:
      return isSetId();
    case EMAIL:
      return isSetEmail();
    }
    throw new IllegalStateException();
  }