@Nullable
  public CommonProblemDescriptor[] checkElement(
      final RefEntity refEntity,
      final AnalysisScope scope,
      final InspectionManager manager,
      final GlobalInspectionContext globalContext,
      final ProblemDescriptionsProcessor processor) {
    if (refEntity instanceof RefMethod) {
      final RefMethod refMethod = (RefMethod) refEntity;

      if (refMethod.isSyntheticJSP()) return null;

      if (refMethod.isExternalOverride()) return null;

      if (!(refMethod.isStatic() || refMethod.isConstructor())
          && !refMethod.getSuperMethods().isEmpty()) return null;

      if ((refMethod.isAbstract() || refMethod.getOwnerClass().isInterface())
          && refMethod.getDerivedMethods().isEmpty()) return null;

      if (RefUtil.isEntryPoint(refMethod)) return null;

      if (refMethod.isAppMain()) return null;

      final ArrayList<RefParameter> unusedParameters = getUnusedParameters(refMethod);

      if (unusedParameters.isEmpty()) return null;

      final List<ProblemDescriptor> result = new ArrayList<ProblemDescriptor>();
      for (RefParameter refParameter : unusedParameters) {
        final PsiIdentifier psiIdentifier = refParameter.getElement().getNameIdentifier();
        if (psiIdentifier != null) {
          result.add(
              manager.createProblemDescriptor(
                  psiIdentifier,
                  refMethod.isAbstract()
                      ? InspectionsBundle.message("inspection.unused.parameter.composer")
                      : InspectionsBundle.message("inspection.unused.parameter.composer1"),
                  new AcceptSuggested(
                      globalContext.getRefManager(), processor, refParameter.toString()),
                  ProblemHighlightType.LIKE_UNUSED_SYMBOL,
                  false));
        }
      }
      return result.toArray(new CommonProblemDescriptor[result.size()]);
    }
    return null;
  }
 @Override
 public void onInitialize(RefElement refElement) {
   ((RefElementImpl) refElement).setFlag(true, CAN_BE_FINAL_MASK);
   if (refElement instanceof RefClass) {
     final RefClass refClass = (RefClass) refElement;
     final PsiClass psiClass = refClass.getElement();
     if (refClass.isEntry()) {
       ((RefClassImpl) refClass).setFlag(false, CAN_BE_FINAL_MASK);
       return;
     }
     if (refClass.isAbstract() || refClass.isAnonymous() || refClass.isInterface()) {
       ((RefClassImpl) refClass).setFlag(false, CAN_BE_FINAL_MASK);
       return;
     }
     if (!refClass.isSelfInheritor(psiClass)) {
       for (PsiClass psiSuperClass : psiClass.getSupers()) {
         if (myManager.belongsToScope(psiSuperClass)) {
           RefClass refSuperClass = (RefClass) myManager.getReference(psiSuperClass);
           if (refSuperClass != null) {
             ((RefClassImpl) refSuperClass).setFlag(false, CAN_BE_FINAL_MASK);
           }
         }
       }
     }
   } else if (refElement instanceof RefMethod) {
     final RefMethod refMethod = (RefMethod) refElement;
     final PsiElement element = refMethod.getElement();
     if (element instanceof PsiMethod) {
       PsiMethod psiMethod = (PsiMethod) element;
       if (refMethod.isConstructor()
           || refMethod.isAbstract()
           || refMethod.isStatic()
           || PsiModifier.PRIVATE.equals(refMethod.getAccessModifier())
           || refMethod.getOwnerClass().isAnonymous()
           || refMethod.getOwnerClass().isInterface()) {
         ((RefMethodImpl) refMethod).setFlag(false, CAN_BE_FINAL_MASK);
       }
       if (PsiModifier.PRIVATE.equals(refMethod.getAccessModifier())
           && refMethod.getOwner() != null
           && !(refMethod.getOwnerClass().getOwner() instanceof RefElement)) {
         ((RefMethodImpl) refMethod).setFlag(false, CAN_BE_FINAL_MASK);
       }
       for (PsiMethod psiSuperMethod : psiMethod.findSuperMethods()) {
         if (myManager.belongsToScope(psiSuperMethod)) {
           RefMethod refSuperMethod = (RefMethod) myManager.getReference(psiSuperMethod);
           if (refSuperMethod != null) {
             ((RefMethodImpl) refSuperMethod).setFlag(false, CAN_BE_FINAL_MASK);
           }
         }
       }
     }
   }
 }
  private boolean isAccessible(
      RefJavaElement to, @PsiModifier.ModifierConstant String accessModifier) {

    for (RefElement refElement : to.getInReferences()) {
      if (!isAccessibleFrom(refElement, to, accessModifier)) return false;
    }

    if (to instanceof RefMethod) {
      RefMethod refMethod = (RefMethod) to;

      if (refMethod.isAbstract()
          && (refMethod.getDerivedMethods().isEmpty()
              || refMethod.getAccessModifier() == PsiModifier.PRIVATE)) return false;

      for (RefMethod refOverride : refMethod.getDerivedMethods()) {
        if (!isAccessibleFrom(refOverride, to, accessModifier)) return false;
      }

      for (RefMethod refSuper : refMethod.getSuperMethods()) {
        if (RefJavaUtil.getInstance().compareAccess(refSuper.getAccessModifier(), accessModifier)
            > 0) return false;
      }
    }

    if (to instanceof RefClass) {
      RefClass refClass = (RefClass) to;
      for (RefClass subClass : refClass.getSubClasses()) {
        if (!isAccessibleFrom(subClass, to, accessModifier)) return false;
      }

      List children = refClass.getChildren();
      if (children != null) {
        for (Object refElement : children) {
          if (!isAccessible((RefJavaElement) refElement, accessModifier)) return false;
        }
      }

      for (final RefElement refElement : refClass.getInTypeReferences()) {
        if (!isAccessibleFrom(refElement, refClass, accessModifier)) return false;
      }

      List<RefJavaElement> classExporters = ((RefClassImpl) refClass).getClassExporters();
      if (classExporters != null) {
        for (RefJavaElement refExporter : classExporters) {
          if (getAccessLevel(accessModifier) < getAccessLevel(refExporter.getAccessModifier()))
            return false;
        }
      }
    }

    return true;
  }