public void processContributorNames(@Nonnull ChooseByNameContributor contributor, @Nonnull FindSymbolParameters parameters, @Nonnull Processor<? super String> nameProcessor) {
  TIntHashSet filter = new TIntHashSet(1000);
  if (contributor instanceof ChooseByNameContributorEx) {
    ((ChooseByNameContributorEx)contributor).processNames(s -> {
      if (nameProcessor.process(s)) {
        filter.add(s.hashCode());
      }
      return true;
    }, parameters.getSearchScope(), parameters.getIdFilter());
  }
  else {
    String[] names = contributor.getNames(myProject, parameters.isSearchInLibraries());
    for (String element : names) {
      if (nameProcessor.process(element)) {
        filter.add(element.hashCode());
      }
    }
  }
  myContributorToItsSymbolsMap.put(contributor, filter);
}