code: private static IPropertiesValidator getValidator(GobblinPresets preset) {
      Objects.requireNonNull(preset);
      switch (preset) {
        case MYSQL_TO_HDFS:
          return new MySqlToHdfsValidator();
        case HDFS_TO_MYSQL:
          return new HdfsToMySqlValidator();
        default:
          throw new UnsupportedOperationException("Preset " + preset + " is not supported");
      }
    }
docs: Factory method that provides IPropertiesValidator based on preset in runtime.
  Using factory method pattern as it is expected to grow.
  
  @return IPropertiesValidator