@Nullable
  private static HighlightInfo checkRefInner(GrReferenceExpression ref) {
    PsiElement refNameElement = ref.getReferenceNameElement();
    if (refNameElement == null) return null;

    boolean cannotBeDynamic = PsiUtil.isCompileStatic(ref) || isPropertyAccessInStaticMethod(ref);
    GroovyResolveResult resolveResult = getBestResolveResult(ref);

    if (resolveResult.getElement() != null) {
      if (!isInspectionEnabled(ref.getContainingFile(), ref.getProject())) return null;

      if (isStaticOk(resolveResult)) return null;
      String message = GroovyBundle.message("cannot.reference.non.static", ref.getReferenceName());
      return createAnnotationForRef(ref, cannotBeDynamic, message);
    }

    if (ResolveUtil.isKeyOfMap(ref) || isClassReference(ref)) {
      return null;
    }

    if (!cannotBeDynamic) {
      if (!isInspectionEnabled(ref.getContainingFile(), ref.getProject())) return null;
      GrUnresolvedAccessInspection inspection =
          getInstance(ref.getContainingFile(), ref.getProject());

      if (!inspection.myHighlightIfGroovyObjectOverridden && areGroovyObjectMethodsOverridden(ref))
        return null;
      if (!inspection.myHighlightIfMissingMethodsDeclared && areMissingMethodsDeclared(ref))
        return null;

      if (GroovySuppressableInspectionTool.isElementToolSuppressedIn(ref, SHORT_NAME)) return null;
    }

    if (cannotBeDynamic || shouldHighlightAsUnresolved(ref)) {
      HighlightInfo info =
          createAnnotationForRef(
              ref, cannotBeDynamic, GroovyBundle.message("cannot.resolve", ref.getReferenceName()));
      LOG.assertTrue(info != null);

      HighlightDisplayKey displayKey = HighlightDisplayKey.find(SHORT_NAME);
      if (ref.getParent() instanceof GrMethodCall) {
        registerStaticImportFix(ref, info, displayKey);
      } else {
        registerCreateClassByTypeFix(ref, info, displayKey);
        registerAddImportFixes(ref, info, displayKey);
      }

      registerReferenceFixes(ref, info, cannotBeDynamic, displayKey);
      UnresolvedReferenceQuickFixProvider.registerReferenceFixes(
          ref, new QuickFixActionRegistrarAdapter(info, displayKey));
      OrderEntryFix.registerFixes(new QuickFixActionRegistrarAdapter(info, displayKey), ref);
      return info;
    }

    return null;
  }
  @Nullable
  private static HighlightInfo createAnnotationForRef(
      @NotNull GrReferenceExpression ref, boolean compileStatic, @NotNull String message) {
    PsiElement refNameElement = ref.getReferenceNameElement();
    assert refNameElement != null;

    HighlightDisplayLevel displayLevel = getHighlightDisplayLevel(ref.getProject(), ref);

    if (compileStatic || displayLevel == HighlightDisplayLevel.ERROR) {
      return HighlightInfo.newHighlightInfo(HighlightInfoType.WRONG_REF)
          .range(refNameElement)
          .descriptionAndTooltip(message)
          .create();
    }

    if (displayLevel == HighlightDisplayLevel.WARNING) {
      boolean isTestMode = ApplicationManager.getApplication().isUnitTestMode();
      HighlightInfoType infotype =
          isTestMode ? HighlightInfoType.WARNING : HighlightInfoType.INFORMATION;

      HighlightInfo.Builder builder =
          HighlightInfo.newHighlightInfo(infotype).range(refNameElement);
      builder.descriptionAndTooltip(message);
      return builder.needsUpdateOnTyping(false).textAttributes(UNRESOLVED_ACCESS).create();
    }

    HighlightInfoType highlightInfoType = HighlightInfo.convertSeverity(displayLevel.getSeverity());
    return HighlightInfo.newHighlightInfo(highlightInfoType)
        .range(refNameElement)
        .descriptionAndTooltip(message)
        .create();
  }
  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;
  }