code: public void update(final int[] data) {
      if ((data == null) || (data.length == 0)) { return; }
      final long[] arr = hash(data, seed);
      hashUpdate(arr[0], arr[1]);
    }
docs: Present the given integer array as a potential unique item.
  If the integer array is null or empty no update attempt is made and the method returns.
  
  @param data The given int array.