class FileNumberPrefixProcessor extends NumberPrefixProcessor {

    @Override
    public String process(String inputPrefix, NameGenerationRequest request) {
        String retVal = "";
        if (request != null && request.getFileNumber() != null) {
            retVal = findAndReplace(inputPrefix, request.getFileNumber());
        }
        return StringUtils.isBlank(retVal) ? inputPrefix : retVal;
    }

      FileNumberPrefixProcessor();

}