code: @Override public int compare(Row o1, Row o2)
     {
        Integer parent1 = o1.getInteger("parent_wbs_id");
        Integer parent2 = o2.getInteger("parent_wbs_id");
        int result = NumberHelper.compare(parent1, parent2);
        if (result == 0)
        {
           Integer seq1 = o1.getInteger("seq_num");
           Integer seq2 = o2.getInteger("seq_num");
           result = NumberHelper.compare(seq1, seq2);
        }
        return result;
     }
docs: {@inheritDoc}