public static void addAllClasses(
      CompletionParameters parameters,
      final CompletionResultSet result,
      final InheritorsHolder inheritors) {
    if (!isClassNamePossible(parameters) || !mayStartClassName(result)) {
      return;
    }

    if (parameters.getInvocationCount() >= 2) {
      JavaClassNameCompletionContributor.addAllClasses(
          parameters,
          parameters.getInvocationCount() <= 2,
          result.getPrefixMatcher(),
          new Consumer<LookupElement>() {
            @Override
            public void consume(LookupElement element) {
              if (!inheritors.alreadyProcessed(element)) {
                result.addElement(element);
              }
            }
          });
    } else {
      advertiseSecondCompletion(parameters.getPosition().getProject(), result);
    }
  }