public @NotNull LombokNullAnnotationLibrary getAddNullAnnotationLombokConfigProperty(@NotNull PsiClass psiClass) {
    final String configProperty = getStringLombokConfigProperty(ConfigKey.ADD_NULL_ANNOTATIONS, psiClass);
    if (StringUtil.isNotEmpty(configProperty)) {
      for (LombokNullAnnotationLibraryDefned library : LombokNullAnnotationLibraryDefned.values()) {
        if (library.getKey().equalsIgnoreCase(configProperty)) {
          return library;
        }
      }

      final LombokNullAnnotationLibrary parsedCustom = LombokNullAnnotationLibraryCustom.parseCustom(configProperty);
      if (null != parsedCustom) {
        return parsedCustom;
      }
    }
    return LombokNullAnnotationLibraryDefned.NONE;
  }
public @NotNull LombokNullAnnotationLibrary getAddNullAnnotationLombokConfigProperty(@NotNull PsiClass psiClass)