@NotNull
  @Override
  protected UsageInfo[] findUsages() {
    ArrayList<UsageInfo> result = new ArrayList<UsageInfo>();

    final PsiMethod toSearchFor = ((PsiMethod) mySettings.getToSearchFor());

    if (!mySettings.generateDelegate()) {
      Collection<PsiReference> refs =
          MethodReferencesSearch.search(
                  toSearchFor, GlobalSearchScope.projectScope(myProject), true)
              .findAll();

      for (PsiReference ref1 : refs) {
        PsiElement ref = ref1.getElement();
        if (ref instanceof PsiMethod && ((PsiMethod) ref).isConstructor()) {
          DefaultConstructorImplicitUsageInfo implicitUsageInfo =
              new DefaultConstructorImplicitUsageInfo(
                  (PsiMethod) ref, ((PsiMethod) ref).getContainingClass(), toSearchFor);
          result.add(implicitUsageInfo);
        } else if (ref instanceof PsiClass) {
          result.add(new NoConstructorClassUsageInfo((PsiClass) ref));
        } else if (!PsiTreeUtil.isAncestor(mySettings.getToReplaceIn(), ref, false)) {
          result.add(new ExternalUsageInfo(ref));
        } else {
          result.add(new ChangedMethodCallInfo(ref));
        }
      }
    }

    if (mySettings.replaceAllOccurrences()) {
      PsiElement[] exprs = GroovyIntroduceParameterUtil.getOccurrences(mySettings);
      for (PsiElement expr : exprs) {
        result.add(new InternalUsageInfo(expr));
      }
    } else {
      if (mySettings.getExpression() != null) {
        result.add(new InternalUsageInfo(mySettings.getExpression()));
      }
    }

    Collection<PsiMethod> overridingMethods =
        OverridingMethodsSearch.search(toSearchFor, true).findAll();

    for (PsiMethod overridingMethod : overridingMethods) {
      result.add(new UsageInfo(overridingMethod));
    }

    final UsageInfo[] usageInfos = result.toArray(new UsageInfo[result.size()]);
    return UsageViewUtil.removeDuplicatedUsages(usageInfos);
  }
  @Override
  protected boolean preprocessUsages(Ref<UsageInfo[]> refUsages) {
    UsageInfo[] usagesIn = refUsages.get();
    MultiMap<PsiElement, String> conflicts = new MultiMap<PsiElement, String>();

    if (!mySettings.generateDelegate()) {
      GroovyIntroduceParameterUtil.detectAccessibilityConflicts(
          mySettings.getExpression(),
          usagesIn,
          conflicts,
          mySettings.replaceFieldsWithGetters()
              != IntroduceParameterRefactoring.REPLACE_FIELDS_WITH_GETTERS_NONE,
          myProject);
    }

    final GrMethod toReplaceIn = (GrMethod) mySettings.getToReplaceIn();
    if (mySettings.getExpression() != null
        && !toReplaceIn.hasModifierProperty(PsiModifier.PRIVATE)) {
      final AnySupers anySupers = new AnySupers();
      mySettings.getExpression().accept(anySupers);
      if (anySupers.containsSupers()) {
        for (UsageInfo usageInfo : usagesIn) {
          if (!(usageInfo.getElement() instanceof PsiMethod)
              && !(usageInfo instanceof InternalUsageInfo)) {
            if (!PsiTreeUtil.isAncestor(
                toReplaceIn.getContainingClass(), usageInfo.getElement(), false)) {
              conflicts.putValue(
                  mySettings.getExpression(),
                  RefactoringBundle.message(
                      "parameter.initializer.contains.0.but.not.all.calls.to.method.are.in.its.class",
                      CommonRefactoringUtil.htmlEmphasize(PsiKeyword.SUPER)));
              break;
            }
          }
        }
      }
    }

    for (IntroduceParameterMethodUsagesProcessor processor :
        IntroduceParameterMethodUsagesProcessor.EP_NAME.getExtensions()) {
      processor.findConflicts(this, refUsages.get(), conflicts);
    }

    return showConflicts(conflicts, usagesIn);
  }
  public GrIntroduceParameterProcessor(GrIntroduceParameterSettings settings) {
    super(settings.getProject());
    this.mySettings = settings;

    LOG.assertTrue(mySettings.getToReplaceIn() instanceof GrMethod);
    LOG.assertTrue(mySettings.getToSearchFor() instanceof PsiMethod);

    final StringPartInfo stringPartInfo = mySettings.getStringPartInfo();
    final GrExpression expression =
        stringPartInfo != null
            ? GrIntroduceHandlerBase.generateExpressionFromStringPart(
                stringPartInfo, settings.getProject())
            : mySettings.getExpression();
    myParameterInitializer = new GrExpressionWrapper(expression);
  }