private void buildUsesReferences(@NotNull PsiJavaModule javaModule) {
    for (PsiUsesStatement statement : javaModule.getUses()) {
      final PsiJavaCodeReferenceElement reference = statement.getClassReference();
      if (reference != null) {
        final PsiElement usedInterface = reference.resolve();
        if (usedInterface instanceof PsiClass) {
          final RefElement refClass = getRefManager().getReference(usedInterface);
          if (refClass instanceof RefClass) {
            if (myUsedServices == null) {
              myUsedServices = new HashSet<>();
            }
            myUsedServices.add((RefClass)refClass);
          }
        }
      }
    }
  }
private void buildUsesReferences(@NotNull PsiJavaModule javaModule)