code: public ChargingMode getVasChargingMode(ChargeMode chargeMode) {
          return chargeMode == null ? ChargingMode.UNSPECIFIED : ChargingMode.fromValue(chargeMode.value());
      }
docs: Maps the {@code io.motown.vas.viewmodel.model.ChargeMode} to a ChargingMode. If chargeMode is null, 'unspecified' will
  be returned.
  
  @param chargeMode charge mode.
  @return charging mode (ChargingMode.UNSPECIFIED is chargeMode is null).