public  <T>Optional<T> parse(String fileString, Class<T> someClass) {

    File file = new File(fileString);

    T newClass = null;

    try {
      JAXBContext jaxbContext = JAXBContext.newInstance(ТУК ТРЯБВА ДА ПОДАМ КЛАСА T AMA NZ KAK);
      Unmarshaller jaxbUnmarshaller = jaxbContext.createUnmarshaller();
      newClass = (T) jaxbUnmarshaller.unmarshal(file);
    } catch (JAXBException e) {
      e.printStackTrace();
    }
    return (Optional<T>) Optional.ofNullable(newClass);
  }