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

    public OptionalEntity<KuromojiItem> getKuromojiItem(final String dictId, final long id) {
        return getKuromojiFile(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 KuromojiFile file = kuromojiService.getKuromojiFile(form.dictId).orElseGet(() -> {
            throwValidationErrorApi(messages -> messages.addErrorsFailedToUploadProtwordsFile(GLOBAL));
            return null;
        });