@Override
    public LegacyFilterConfig getConfig() {
        final LegacyFilterConfig result = new LegacyFilterConfig();
        result.putDefaultList(getConfigInternal());
        return result;
    }
Base class for filters where a cache can have one value out of a group of values
(e.g. cache type, cache size etc). Filter checks whether the cache value is in a to-be-filtered set of such values.
<br>
This class supports grouping of selectable values, e.g. a bunch of selectable values can be grouped,
and by selecing the group the filter checks for the cache to have any "raw" value assigned to this group

@param <T> class for "raw" cache values to filter
@param <G> class for "Groups". Might be same as T, in this case the filter has autosupport for
           the case that each group (of class G) has exactly one (=the same) element of class T
main/src/main/java/cgeo/geocaching/filters/core/ValueGroupGeocacheFilter.java