private static AllowedValues getAllowedValuesFromMagic(
      @NotNull PsiModifierListOwner element, @NotNull PsiType type, PsiAnnotation magic) {
    if (magic == null) return null;
    PsiAnnotationMemberValue[] allowedValues;
    final boolean canBeOred;
    if (TypeConversionUtil.getTypeRank(type) <= TypeConversionUtil.LONG_RANK) {
      PsiAnnotationMemberValue intValues = magic.findAttributeValue("intValues");
      allowedValues =
          intValues instanceof PsiArrayInitializerMemberValue
              ? ((PsiArrayInitializerMemberValue) intValues).getInitializers()
              : PsiAnnotationMemberValue.EMPTY_ARRAY;
      if (allowedValues.length == 0) {
        PsiAnnotationMemberValue orValue = magic.findAttributeValue("flags");
        allowedValues =
            orValue instanceof PsiArrayInitializerMemberValue
                ? ((PsiArrayInitializerMemberValue) orValue).getInitializers()
                : PsiAnnotationMemberValue.EMPTY_ARRAY;
        canBeOred = true;
      } else {
        canBeOred = false;
      }
    } else if (type.equals(
        PsiType.getJavaLangString(
            element.getManager(), GlobalSearchScope.allScope(element.getProject())))) {
      PsiAnnotationMemberValue strValuesAttr = magic.findAttributeValue("stringValues");
      allowedValues =
          strValuesAttr instanceof PsiArrayInitializerMemberValue
              ? ((PsiArrayInitializerMemberValue) strValuesAttr).getInitializers()
              : PsiAnnotationMemberValue.EMPTY_ARRAY;
      canBeOred = false;
    } else {
      return null; // other types not supported
    }

    if (allowedValues.length != 0) {
      return new AllowedValues(allowedValues, canBeOred);
    }

    // last resort: try valuesFromClass
    PsiAnnotationMemberValue[] values = readFromClass("valuesFromClass", magic, type);
    boolean ored = false;
    if (values == null) {
      values = readFromClass("flagsFromClass", magic, type);
      ored = true;
    }
    if (values == null) return null;
    return new AllowedValues(values, ored);
  }
 public static boolean isNotNull(@NotNull PsiModifierListOwner owner) {
   return getInstance(owner.getProject()).isNotNull(owner, true);
 }