/**
   * Extract the enumeration constants
   *
   * @param enumeration is the enumeration
   * @return is the string with constants
   */
  protected String getEnumerationConstants(Class<?> enumeration) {
    Object[] constants = enumeration.getEnumConstants();

    int idx = 0;
    StringBuffer strBuff = new StringBuffer();
    for (Object konst : constants) {
      strBuff.append(konst.toString());

      if (idx < constants.length - 1) {
        strBuff.append(", ");
      }

      ++idx;
    }

    return strBuff.toString();
  }