/**
  * Internals of findWithContinuation implementation which allows control over functor filtering.
  */
 private ExtendedIterator<Triple> findWithContinuation(
     TriplePattern pattern, Finder continuation, boolean filter) {
   checkOpen();
   this.requirePrepared();
   ExtendedIterator<Triple> result = null;
   if (fdata == null) {
     result = fdeductions.findWithContinuation(pattern, continuation);
   } else {
     if (continuation == null) {
       result = fdata.findWithContinuation(pattern, fdeductions);
     } else {
       result = fdata.findWithContinuation(pattern, FinderUtil.cascade(fdeductions, continuation));
     }
   }
   if (filter && filterFunctors) {
     return result.filterDrop(Functor.acceptFilter);
   } else {
     return result;
   }
 }