private static boolean areGroovyObjectMethodsOverridden(GrReferenceExpression ref) {
    PsiType qualifierType = GrReferenceResolveUtil.getQualifierType(ref);
    if (!(qualifierType instanceof PsiClassType)) return false;

    PsiClass resolved = ((PsiClassType) qualifierType).resolve();
    if (resolved == null) return false;

    PsiClass groovyObject =
        JavaPsiFacade.getInstance(ref.getProject())
            .findClass(GroovyCommonClassNames.GROOVY_OBJECT, ref.getResolveScope());
    if (groovyObject == null) return false;

    String methodName;
    if (ref.getParent() instanceof GrCall) {
      methodName = "invokeMethod";
    } else if (PsiUtil.isLValue(ref)) {
      methodName = "setProperty";
    } else {
      methodName = "getProperty";
    }

    PsiMethod[] patternMethods = groovyObject.findMethodsByName(methodName, false);
    if (patternMethods.length != 1) return false;

    PsiMethod patternMethod = patternMethods[0];
    PsiMethod found = resolved.findMethodBySignature(patternMethod, true);
    if (found == null) return false;

    PsiClass aClass = found.getContainingClass();
    if (aClass == null) return false;
    String qname = aClass.getQualifiedName();
    if (GroovyCommonClassNames.GROOVY_OBJECT.equals(qname)) return false;
    if (GroovyCommonClassNames.GROOVY_OBJECT_SUPPORT.equals(qname)) return false;

    return true;
  }
  @Nullable
  private PsiType getNominalTypeInner(PsiElement resolved) {
    if (resolved == null && !"class".equals(getReferenceName())) {
      resolved = resolve();
    }

    if (resolved instanceof PsiClass) {
      final PsiElementFactory factory = JavaPsiFacade.getInstance(getProject()).getElementFactory();
      if (PsiUtil.isInstanceThisRef(this)) {
        final PsiClassType categoryType = GdkMethodUtil.getCategoryType((PsiClass) resolved);
        if (categoryType != null) {
          return categoryType;
        } else {
          return factory.createType((PsiClass) resolved);
        }
      }
      if (getParent() instanceof GrReferenceExpression || PsiUtil.isSuperReference(this)) {
        return factory.createType((PsiClass) resolved);
      } else {
        return TypesUtil.createJavaLangClassType(
            factory.createType((PsiClass) resolved), getProject(), getResolveScope());
      }
    }

    if (resolved instanceof GrVariable) {
      return ((GrVariable) resolved).getDeclaredType();
    }

    if (resolved instanceof PsiVariable) {
      return ((PsiVariable) resolved).getType();
    }

    if (resolved instanceof PsiMethod) {
      PsiMethod method = (PsiMethod) resolved;
      if (PropertyUtil.isSimplePropertySetter(method)
          && !method.getName().equals(getReferenceName())) {
        return method.getParameterList().getParameters()[0].getType();
      }

      // 'class' property with explicit generic
      PsiClass containingClass = method.getContainingClass();
      if (containingClass != null
          && CommonClassNames.JAVA_LANG_OBJECT.equals(containingClass.getQualifiedName())
          && "getClass".equals(method.getName())) {
        return TypesUtil.createJavaLangClassType(
            GrReferenceResolveUtil.getQualifierType(this), getProject(), getResolveScope());
      }

      return PsiUtil.getSmartReturnType(method);
    }

    if (resolved instanceof GrReferenceExpression) {
      PsiElement parent = resolved.getParent();
      if (parent instanceof GrAssignmentExpression) {
        GrAssignmentExpression assignment = (GrAssignmentExpression) parent;
        if (resolved.equals(assignment.getLValue())) {
          GrExpression rValue = assignment.getRValue();
          if (rValue != null) {
            PsiType rType = rValue.getType();
            if (rType != null) {
              return rType;
            }
          }
        }
      }
    }

    if (resolved == null) {
      final PsiType fromClassRef = getTypeFromClassRef(this);
      if (fromClassRef != null) {
        return fromClassRef;
      }

      final PsiType fromMapAccess = getTypeFromMapAccess(this);
      if (fromMapAccess != null) {
        return fromMapAccess;
      }

      final PsiType fromSpreadOperator = getTypeFromSpreadOperator(this);
      if (fromSpreadOperator != null) {
        return fromSpreadOperator;
      }
    }

    return null;
  }