@Override
    public String getPresentationText(@NotNull DfType dfType, @Nullable PsiType type) {
      if (dfType == DfTypes.NULL) {
        return JavaAnalysisBundle.message("dftype.presentation.empty.optional");
      }
      if ((!dfType.isSuperType(DfTypes.NULL))) {
        return JavaAnalysisBundle.message("dftype.presentation.present.optional");
      }
      return "";
    }
@Override
    public String getPresentationText(@NotNull DfType dfType, @Nullable PsiType type)