}

    public OptionalEntity<SynonymFile> getSynonymFile(final String dictId) {
        return dictionaryManager.getDictionaryFile(dictId).filter(SynonymFile.class::isInstance)
                .map(file -> OptionalEntity.of((SynonymFile) file)).orElse(OptionalEntity.empty());
    }

    public OptionalEntity<SynonymItem> getSynonymItem(final String dictId, final long id) {
        return getSynonymFile(dictId).map(file -> file.get(id).get());
    }

    public JsonResponse<ApiResult> post$upload(final String dictId, final UploadForm form) {
        form.dictId = dictId;
        validateApi(form, messages -> {});
        final SynonymFile file = synonymService.getSynonymFile(form.dictId).orElseGet(() -> {
            throwValidationErrorApi(messages -> messages.addErrorsFailedToUploadProtwordsFile(GLOBAL));
            return null;
        });