Servicio de Validaciones

package cl.awto.microservice.poinvoice.v2.service;

import cl.awto.microservice.msmodel.domain.model.invoicing.enums.PurchaseOrderType;
import cl.awto.microservice.poinvoice.service.message.MessageService;
import cl.awto.microservice.poinvoice.v2.domain.enums.MessageKey;
import cl.awto.microservice.poinvoice.v2.domain.enums.MissingData;
import cl.awto.microservice.poinvoice.v2.domain.exceptions.MissingDataException;
import cl.awto.microservice.poinvoice.v2.domain.purchaseorder.PurchaseOrderData;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;

@Service("v2/validatorServiceImpl")
public class ValidatorServiceImpl implements ValidatorService{

    @Autowired
    private MessageService messageService;

    /**
     * Reglas a validar:
     *  - Que el monto no sea null
     *  - Que el monto sea positivo
     *  - Si el tipo de orden es TRIP, el tripId debe ser obligatorio.
     *  - Si el tipo de orden es MEMBERSHIP, userId y membershipId deben ser obligatorios.
     *  - En cualquier otro caso, el userId debe ser obligatorio.
     *
     * @param purchaseOrderData
     * @param purchaseOrderType
     * @throws MissingDataException
     */
    @Override
    public void validatePurchaseOrderData(PurchaseOrderData purchaseOrderData, PurchaseOrderType purchaseOrderType) throws MissingDataException {
        Double amountWithoutTax = purchaseOrderData.getAmountWithoutTax();

        if(amountWithoutTax == null){
            final String MESSAGE = messageService.getMessage(MessageKey.MISSING_DATA, MissingData.AMOUNT);
            throw new MissingDataException(MESSAGE);
        }

        if(amountWithoutTax <= 0){
            final String MESSAGE = messageService.getMessage(MessageKey.MISSING_DATA, MissingData.POSITIVE_AMOUNT);
            throw new MissingDataException(MESSAGE);
        }

        switch (purchaseOrderType){
            case TRIP_BY_DAY:
            case TRIP_BY_MINUTE:
                if(purchaseOrderData.getTripId() == null){
                    final String MESSAGE = messageService.getMessage(MessageKey.MISSING_DATA, MissingData.TRIP_ID);
                    throw new MissingDataException(MESSAGE);
                }
                break;
            case MEMBERSHIP:
                if(purchaseOrderData.getUserId() == null){
                    final String MESSAGE = messageService.getMessage(MessageKey.MISSING_DATA, MissingData.USER_ID);
                    throw new MissingDataException(MESSAGE);
                }

                if(purchaseOrderData.getMembershipId() == null){
                    final String MESSAGE = messageService.getMessage(MessageKey.MISSING_DATA, MissingData.MEMBERSHIP_ID);
                    throw new MissingDataException(MESSAGE);
                }
                break;

            default:
                if(purchaseOrderData.getUserId() == null){
                    final String MESSAGE = messageService.getMessage(MessageKey.MISSING_DATA, MissingData.USER_ID);
                    throw new MissingDataException(MESSAGE);
                }
        }
    }
}