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);
  }
  private static PsiAnnotationMemberValue[] readFromClass(
      @NonNls String attributeName, @NotNull PsiAnnotation magic, PsiType type) {
    PsiAnnotationMemberValue fromClassAttr = magic.findAttributeValue(attributeName);
    PsiType fromClassType =
        fromClassAttr instanceof PsiClassObjectAccessExpression
            ? ((PsiClassObjectAccessExpression) fromClassAttr).getOperand().getType()
            : null;
    PsiClass fromClass =
        fromClassType instanceof PsiClassType ? ((PsiClassType) fromClassType).resolve() : null;
    if (fromClass == null) return null;
    String fqn = fromClass.getQualifiedName();
    if (fqn == null) return null;
    List<PsiAnnotationMemberValue> constants = new ArrayList<PsiAnnotationMemberValue>();
    for (PsiField field : fromClass.getFields()) {
      if (!field.hasModifierProperty(PsiModifier.PUBLIC)
          || !field.hasModifierProperty(PsiModifier.STATIC)
          || !field.hasModifierProperty(PsiModifier.FINAL)) continue;
      PsiType fieldType = field.getType();
      if (!Comparing.equal(fieldType, type)) continue;
      PsiAssignmentExpression e =
          (PsiAssignmentExpression)
              JavaPsiFacade.getElementFactory(field.getProject())
                  .createExpressionFromText("x=" + fqn + "." + field.getName(), field);
      PsiReferenceExpression refToField = (PsiReferenceExpression) e.getRExpression();
      constants.add(refToField);
    }
    if (constants.isEmpty()) return null;

    return constants.toArray(new PsiAnnotationMemberValue[constants.size()]);
  }
 @Nullable
 public static String calcAnnotationValue(@NotNull PsiAnnotation annotation, @NonNls String attr) {
   PsiElement value = annotation.findAttributeValue(attr);
   Object o = CONSTANT_EVALUATION_HELPER.computeConstantExpression(value);
   if (o instanceof String) {
     return (String) o;
   }
   return null;
 }
  private static AllowedValues parseBeanInfo(@NotNull PsiModifierListOwner owner) {
    PsiMethod method = null;
    if (owner instanceof PsiParameter) {
      PsiParameter parameter = (PsiParameter) owner;
      PsiElement scope = parameter.getDeclarationScope();
      if (!(scope instanceof PsiMethod)) return null;
      PsiElement nav = scope.getNavigationElement();
      if (!(nav instanceof PsiMethod)) return null;
      method = (PsiMethod) nav;
      if (method.isConstructor()) {
        // not a property, try the @ConstructorProperties({"prop"})
        PsiAnnotation annotation =
            AnnotationUtil.findAnnotation(method, "java.beans.ConstructorProperties");
        if (annotation == null) return null;
        PsiAnnotationMemberValue value = annotation.findAttributeValue("value");
        if (!(value instanceof PsiArrayInitializerMemberValue)) return null;
        PsiAnnotationMemberValue[] initializers =
            ((PsiArrayInitializerMemberValue) value).getInitializers();
        PsiElement parent = parameter.getParent();
        if (!(parent instanceof PsiParameterList)) return null;
        int index = ((PsiParameterList) parent).getParameterIndex(parameter);
        if (index >= initializers.length) return null;
        PsiAnnotationMemberValue initializer = initializers[index];
        if (!(initializer instanceof PsiLiteralExpression)) return null;
        Object val = ((PsiLiteralExpression) initializer).getValue();
        if (!(val instanceof String)) return null;
        PsiMethod setter =
            PropertyUtil.findPropertySetter(
                method.getContainingClass(), (String) val, false, false);
        if (setter == null) return null;
        // try the @beaninfo of the corresponding setter
        method = (PsiMethod) setter.getNavigationElement();
      }
    } else if (owner instanceof PsiMethod) {
      PsiElement nav = owner.getNavigationElement();
      if (!(nav instanceof PsiMethod)) return null;
      method = (PsiMethod) nav;
    }
    if (method == null) return null;

    PsiClass aClass = method.getContainingClass();
    if (aClass == null) return null;
    if (PropertyUtil.isSimplePropertyGetter(method)) {
      List<PsiMethod> setters =
          PropertyUtil.getSetters(aClass, PropertyUtil.getPropertyNameByGetter(method));
      if (setters.size() != 1) return null;
      method = setters.get(0);
    }
    if (!PropertyUtil.isSimplePropertySetter(method)) return null;
    PsiDocComment doc = method.getDocComment();
    if (doc == null) return null;
    PsiDocTag beaninfo = doc.findTagByName("beaninfo");
    if (beaninfo == null) return null;
    String data =
        StringUtil.join(
            beaninfo.getDataElements(),
            new Function<PsiElement, String>() {
              @Override
              public String fun(PsiElement element) {
                return element.getText();
              }
            },
            "\n");
    int enumIndex = StringUtil.indexOfSubstringEnd(data, "enum:");
    if (enumIndex == -1) return null;
    data = data.substring(enumIndex);
    int colon = data.indexOf(":");
    int last = colon == -1 ? data.length() : data.substring(0, colon).lastIndexOf("\n");
    data = data.substring(0, last);

    List<PsiAnnotationMemberValue> values = new ArrayList<PsiAnnotationMemberValue>();
    for (String line : StringUtil.splitByLines(data)) {
      List<String> words = StringUtil.split(line, " ", true, true);
      if (words.size() != 2) continue;
      String ref = words.get(1);
      PsiExpression constRef =
          JavaPsiFacade.getElementFactory(aClass.getProject())
              .createExpressionFromText(ref, aClass);
      if (!(constRef instanceof PsiReferenceExpression)) continue;
      PsiReferenceExpression expr = (PsiReferenceExpression) constRef;
      values.add(expr);
    }
    if (values.isEmpty()) return null;
    PsiAnnotationMemberValue[] array = values.toArray(new PsiAnnotationMemberValue[values.size()]);
    return new AllowedValues(array, false);
  }