private RowFilter createStringOperator(
      final String right,
      final int modelIndex,
      final FormatWrapper format,
      final Comparator stringComparator) {
      return new RowFilter() {
        @Override
        public boolean include(Entry entry) {
          Object left = entry.getValue(modelIndex);
          String value = format.format(left);

          return expected == (stringComparator.compare(value, right)
                              == 0);
        }
      };
    }
private RowFilter createStringOperator(
      final String right,
      final int modelIndex,
      final FormatWrapper format,
      final Comparator stringComparator)