code: @Override
    public final E fromString(final Map<String, Object> pAddParam,
      final String pStrVal) throws Exception {
      if (pStrVal == null || "".equals(pStrVal)) {
        return null;
      }
      return Enum.valueOf(this.enumClass, pStrVal);
    }
docs: <p>Convert from string.</p>
  @param pAddParam additional params, e.g. IRequestData
  to fill owner itsVersion.
  @param pStrVal name
  @return Enum value
  @throws Exception - an exception