@NotNull
  private static EncapsulateFieldsDialog.EncapsulateFieldsContainer prepare(@NotNull  PsiClass aClass,
                                                                            @NotNull Set<PsiField> preselectedFields) {
    return EncapsulateFieldsDialog.EncapsulateFieldsContainer.create(aClass, preselectedFields, new JavaEncapsulateFieldHelper());
  }
@NotNull
  private static EncapsulateFieldsDialog.EncapsulateFieldsContainer prepare(@NotNull  PsiClass aClass,
                                                                            @NotNull Set<PsiField> preselectedFields)