public Builder<T> addCaseAwareComparator(final String fieldId,
                                                     final Comparator<T> caseSenseComparator,
                                                     final Comparator<T> caseInSenseComparator) {
                Objects.requireNonNull(fieldId);
                Objects.requireNonNull(caseSenseComparator);
                Objects.requireNonNull(caseInSenseComparator);
                comparatorMap.put(fieldId, new CaseAwareComparatorImpl<>(
                        caseSenseComparator,
                        caseInSenseComparator));
                return this;
            }
Adds the supplied pair of comparators for fieldId.
stroom-util-shared/src/main/java/stroom/util/shared/CompareUtil.java