/** Get statistical login variable value. */
  private static String getStatisticalLoginVariableValue(
      FtpIoSession session, FtpServerContext context, String varName) {
    String varVal = null;
    FtpStatistics stat = context.getFtpStatistics();

    // total login number
    if (varName.equals(STAT_LOGIN_TOTAL)) {
      varVal = String.valueOf(stat.getTotalLoginNumber());
    }

    // current login number
    else if (varName.equals(STAT_LOGIN_CURR)) {
      varVal = String.valueOf(stat.getCurrentLoginNumber());
    }

    // total anonymous login number
    else if (varName.equals(STAT_LOGIN_ANON_TOTAL)) {
      varVal = String.valueOf(stat.getTotalAnonymousLoginNumber());
    }

    // current anonymous login number
    else if (varName.equals(STAT_LOGIN_ANON_CURR)) {
      varVal = String.valueOf(stat.getCurrentAnonymousLoginNumber());
    }

    return varVal;
  }