private boolean findRenamedVariables(final List<UsageInfo> variableUsages) {
    for (final AutomaticRenamer automaticVariableRenamer : myRenamers) {
      if (!automaticVariableRenamer.hasAnythingToRename()) continue;
      if (!showAutomaticRenamingDialog(automaticVariableRenamer)) return false;
    }

    final Runnable runnable =
        new Runnable() {
          public void run() {
            for (final AutomaticRenamer renamer : myRenamers) {
              renamer.findUsages(
                  variableUsages, mySearchInComments, mySearchTextOccurrences, mySkippedUsages);
            }
          }
        };

    return ProgressManager.getInstance()
        .runProcessWithProgressSynchronously(
            runnable, RefactoringBundle.message("searching.for.variables"), true, myProject);
  }
  public boolean preprocessUsages(final Ref<UsageInfo[]> refUsages) {
    UsageInfo[] usagesIn = refUsages.get();
    MultiMap<PsiElement, String> conflicts = new MultiMap<PsiElement, String>();

    RenameUtil.addConflictDescriptions(usagesIn, conflicts);
    RenamePsiElementProcessor.forElement(myPrimaryElement)
        .findExistingNameConflicts(myPrimaryElement, myNewName, conflicts);
    if (!conflicts.isEmpty()) {
      if (ApplicationManager.getApplication().isUnitTestMode()) {
        throw new ConflictsInTestsException(conflicts.values());
      }
      ConflictsDialog conflictsDialog = prepareConflictsDialog(conflicts, refUsages.get());
      conflictsDialog.show();
      if (!conflictsDialog.isOK()) {
        if (conflictsDialog.isShowConflicts()) prepareSuccessful();
        return false;
      }
    }

    final List<UsageInfo> variableUsages = new ArrayList<UsageInfo>();
    if (!myRenamers.isEmpty()) {
      if (!findRenamedVariables(variableUsages)) return false;
      final LinkedHashMap<PsiElement, String> renames = new LinkedHashMap<PsiElement, String>();
      for (final AutomaticRenamer renamer : myRenamers) {
        final List<? extends PsiNamedElement> variables = renamer.getElements();
        for (final PsiNamedElement variable : variables) {
          final String newName = renamer.getNewName(variable);
          if (newName != null) {
            addElement(variable, newName);
            prepareRenaming(variable, newName, renames);
          }
        }
      }
      if (!renames.isEmpty()) {
        myAllRenames.putAll(renames);
        final Runnable runnable =
            new Runnable() {
              public void run() {
                for (Map.Entry<PsiElement, String> entry : renames.entrySet()) {
                  final UsageInfo[] usages =
                      RenameUtil.findUsages(
                          entry.getKey(),
                          entry.getValue(),
                          mySearchInComments,
                          mySearchTextOccurrences,
                          myAllRenames);
                  Collections.addAll(variableUsages, usages);
                }
              }
            };
        if (!ProgressManager.getInstance()
            .runProcessWithProgressSynchronously(
                runnable, RefactoringBundle.message("searching.for.variables"), true, myProject)) {
          return false;
        }
      }
    }

    final Set<UsageInfo> usagesSet = new HashSet<UsageInfo>(Arrays.asList(usagesIn));
    usagesSet.addAll(variableUsages);
    final List<UnresolvableCollisionUsageInfo> conflictUsages =
        RenameUtil.removeConflictUsages(usagesSet);
    if (conflictUsages != null) {
      mySkippedUsages.addAll(conflictUsages);
    }
    refUsages.set(usagesSet.toArray(new UsageInfo[usagesSet.size()]));

    prepareSuccessful();
    return true;
  }