/** {@inheritDoc} */ @Override public <T> Iterator<FijiCell<T>> iterator(final String family) { final FamilyLayout familyLayout = mLayout.getFamilyMap().get(family); Preconditions.checkArgument(familyLayout != null, "Column %s has no data request.", family); Preconditions.checkState(familyLayout.isMapType(), "iterator(String family) is only enabled on map type column families." + " The column family [%s], is a group type column family." + " Please use the iterator(String family, String qualifier) method.", family); return iterator(family, null); }