private void findParametersUsage(
      final PsiMethod method, ArrayList<UsageInfo> result, PsiMethod[] overriders) {
    if (JavaLanguage.INSTANCE.equals(myChangeInfo.getLanguage())) {
      PsiParameter[] parameters = method.getParameterList().getParameters();
      for (ParameterInfo info : myChangeInfo.getNewParameters()) {
        if (info.getOldIndex() >= 0) {
          PsiParameter parameter = parameters[info.getOldIndex()];
          if (!info.getName().equals(parameter.getName())) {
            addParameterUsages(parameter, result, info);

            for (PsiMethod overrider : overriders) {
              PsiParameter parameter1 =
                  overrider.getParameterList().getParameters()[info.getOldIndex()];
              if (parameter1 != null
                  && Comparing.strEqual(parameter.getName(), parameter1.getName())) {
                addParameterUsages(parameter1, result, info);
              }
            }
          }
        }
      }
    }
  }
 @Override
 public boolean setupDefaultValues(
     ChangeInfo changeInfo, Ref<UsageInfo[]> refUsages, Project project) {
   if (!(changeInfo instanceof JavaChangeInfo)) return true;
   for (UsageInfo usageInfo : refUsages.get()) {
     if (usageInfo instanceof GrMethodCallUsageInfo) {
       GrMethodCallUsageInfo methodCallUsageInfo = (GrMethodCallUsageInfo) usageInfo;
       if (methodCallUsageInfo.isToChangeArguments()) {
         final PsiElement element = methodCallUsageInfo.getElement();
         if (element == null) continue;
         final PsiMethod caller = RefactoringUtil.getEnclosingMethod(element);
         final boolean needDefaultValue =
             !((JavaChangeInfo) changeInfo).getMethodsToPropagateParameters().contains(caller);
         final PsiMethod referencedMethod = methodCallUsageInfo.getReferencedMethod();
         if (needDefaultValue
             && (caller == null
                 || referencedMethod == null
                 || !MethodSignatureUtil.isSuperMethod(referencedMethod, caller))) {
           final ParameterInfo[] parameters = changeInfo.getNewParameters();
           for (ParameterInfo parameter : parameters) {
             final String defaultValue = parameter.getDefaultValue();
             if (defaultValue == null && parameter.getOldIndex() == -1) {
               ((ParameterInfoImpl) parameter).setDefaultValue("");
               if (!ApplicationManager.getApplication().isUnitTestMode()) {
                 final PsiType type =
                     ((ParameterInfoImpl) parameter)
                         .getTypeWrapper()
                         .getType(element, element.getManager());
                 final DefaultValueChooser chooser =
                     new DefaultValueChooser(
                         project, parameter.getName(), PsiTypesUtil.getDefaultValueOfType(type));
                 chooser.show();
                 if (chooser.isOK()) {
                   if (chooser.feelLucky()) {
                     parameter.setUseAnySingleVariable(true);
                   } else {
                     ((ParameterInfoImpl) parameter).setDefaultValue(chooser.getDefaultValue());
                   }
                 } else {
                   return false;
                 }
               }
             }
           }
         }
       }
     }
   }
   return true;
 }
  private void detectLocalsCollisionsInMethod(
      final PsiMethod method, final ArrayList<UsageInfo> result, boolean isOriginal) {
    if (!JavaLanguage.INSTANCE.equals(method.getLanguage())) return;

    final PsiParameter[] parameters = method.getParameterList().getParameters();
    final Set<PsiParameter> deletedOrRenamedParameters = new HashSet<PsiParameter>();
    if (isOriginal) {
      ContainerUtil.addAll(deletedOrRenamedParameters, parameters);
      for (ParameterInfo parameterInfo : myChangeInfo.getNewParameters()) {
        if (parameterInfo.getOldIndex() >= 0 && parameterInfo.getOldIndex() < parameters.length) {
          final PsiParameter parameter = parameters[parameterInfo.getOldIndex()];
          if (parameterInfo.getName().equals(parameter.getName())) {
            deletedOrRenamedParameters.remove(parameter);
          }
        }
      }
    }

    for (ParameterInfo parameterInfo : myChangeInfo.getNewParameters()) {
      final int oldParameterIndex = parameterInfo.getOldIndex();
      final String newName = parameterInfo.getName();
      if (oldParameterIndex >= 0) {
        if (isOriginal
            && oldParameterIndex < parameters.length
            && !newName.equals(myChangeInfo.getOldParameterNames()[oldParameterIndex])) {
          // Name changes take place only in primary method when name was actually changed
          final PsiParameter parameter = parameters[oldParameterIndex];
          if (!newName.equals(parameter.getName())) {
            JavaUnresolvableLocalCollisionDetector.visitLocalsCollisions(
                parameter,
                newName,
                method.getBody(),
                null,
                new JavaUnresolvableLocalCollisionDetector.CollidingVariableVisitor() {
                  public void visitCollidingElement(final PsiVariable collidingVariable) {
                    if (!deletedOrRenamedParameters.contains(collidingVariable)) {
                      result.add(
                          new RenamedParameterCollidesWithLocalUsageInfo(
                              parameter, collidingVariable, method));
                    }
                  }
                });
          }
        }
      } else {
        JavaUnresolvableLocalCollisionDetector.visitLocalsCollisions(
            method,
            newName,
            method.getBody(),
            null,
            new JavaUnresolvableLocalCollisionDetector.CollidingVariableVisitor() {
              public void visitCollidingElement(PsiVariable collidingVariable) {
                if (!deletedOrRenamedParameters.contains(collidingVariable)) {
                  result.add(
                      new NewParameterCollidesWithLocalUsageInfo(
                          collidingVariable, collidingVariable, method));
                }
              }
            });
      }
    }
  }