/**
   * Create mapper.
   *
   * @param dictionary Dictionary.
   * @param useDfltUsrName Whether to use default user name.
   * @param dfltUsrName Default user name.
   * @return Mapper.
   */
  private BasicUserNameMapper create(
      @Nullable Map<String, String> dictionary,
      boolean useDfltUsrName,
      @Nullable String dfltUsrName) {
    BasicUserNameMapper mapper = new BasicUserNameMapper();

    mapper.setMappings(dictionary);
    mapper.setUseDefaultUserName(useDfltUsrName);
    mapper.setDefaultUserName(dfltUsrName);

    return mapper;
  }