public Cursor<S> fetch(FilterValues<S> values, Query.Controller controller)
     throws FetchException {
   return mSupport.fetchOne(mIndex, values.getValuesFor(mKeyFilter), controller);
 }
 public Cursor<S> fetch(FilterValues<S> values) throws FetchException {
   return mSupport.fetchOne(mIndex, values.getValuesFor(mKeyFilter));
 }