@Override
        public Count<Long> getTotalChars() {
            if (lastResult != null && lastResult.getTotalCharacterCount() != null) {
                return lastResult.getTotalCharacterCount();
            } else {
                return Count.approximately(0L);
            }
        }
Used for navigating standard char based data using char offsets.
stroom-core-client/src/main/java/stroom/data/client/presenter/SourcePresenter.java