code: public static final FilterOperation mapFilterAbbreviationToOperation(String abbrev) {
          for(int i = 0; i < FILTER_OPERATIONS.length; i++) {
              FilterOperation fOp = FILTER_OPERATIONS[i];
              if(fOp.getAbbreviation().equals(abbrev))
                  return fOp;
          }
          return null;
      }
docs: Lookup a filter operation given a filter operation abbreviation.  The abbreviation should be obtained
  via {@link org.apache.beehive.netui.databinding.datagrid.api.filter.FilterOperation#getAbbreviation()}.
  @param abbrev
  @return the filter operation