final SynonymFile synonymFile = new SynonymFile(file1);
         final PagingList<SynonymItem> itemList1 = synonymFile.selectList(0, 20);
         assertEquals(5, itemList1.size());

         final SynonymItem synonymItem1 = itemList1.get(0);
         synonymFile.delete(synonymItem1);
         final PagingList<SynonymItem> itemList2 = synonymFile.selectList(0, 20);

                                    <label for="synonymFile" class="col-sm-3 text-sm-right col-form-label"><la:message
                                            key="labels.dict_synonym_file"/></label>
                                    <div class="col-sm-9">
                                        <input type="file" id="synonymFile" name="synonymFile" class="form-control-file"/>
                                    </div>

        final DictionaryManager dictionaryManager = new DictionaryManager();
        final SynonymCreator synonymCreator = new SynonymCreator();
        final SynonymFile synonymFile = (SynonymFile) synonymCreator.create(file1.getPath(), new Date());
        dictionaryManager.store(synonymFile, file1);
        final DictionaryFile<? extends DictionaryItem>[] synonymFiles = dictionaryManager.getDictionaryFiles();
        assertEquals(1, synonymFiles.length);

        dictionaryManager.addCreator(this);
    }

    /**
     * Creates a new {@link SynonymFile} instance.
     *
     * @param id        The unique identifier for the dictionary file.
     * @param path      The file path of the dictionary.
     * @param timestamp The last modified timestamp of the file.
     * @return A new {@link SynonymFile} associated with the dictionary manager.
     */
    @Override

     * @return An optional entity containing the synonym file, or empty if not found.
     */
    public OptionalEntity<SynonymFile> getSynonymFile(final String dictId) {
        return dictionaryManager.getDictionaryFile(dictId)
                .filter(SynonymFile.class::isInstance)
                .map(file -> OptionalEntity.of((SynonymFile) file))
                .orElse(OptionalEntity.empty());
    }

    /**

        form.dictId = dictId;
        validateApi(form, messages -> {});
        final SynonymFile file = synonymService.getSynonymFile(form.dictId).orElseGet(() -> {
            throwValidationErrorApi(messages -> messages.addErrorsFailedToUploadProtwordsFile(GLOBAL));
            return null;
        });
        try (InputStream inputStream = form.synonymFile.getInputStream()) {
            file.update(inputStream);

    /**
     * The multipart file containing the synonym mappings to be uploaded.
     * This file should contain synonym definitions in the appropriate format.
     */
    @Required
    public MultipartFormFile synonymFile;

    /**
     * Default constructor for UploadForm.
     * Creates a new instance with default values.
     */
    public UploadForm() {
        // Default constructor
    }