/**
 * 基类
 */
public interface LogisticsService {

    boolean isCurrentLogistic(Integer type);

    BigDecimal calculateFee(TransferFeeReq req);
}

/**
 * 实现类1 
 */
@Component
public class SFTransferCompany implements LogisticsService {
    private final BigDecimal minDistance = BigDecimal.valueOf(80);

    private final BigDecimal pickFee = BigDecimal.valueOf(70);

    @Override
    public boolean isCurrentLogistic(Integer type) {
        return Objects.equals(type, 2);
    }

    @Override
    public BigDecimal calculateFee(TransferFeeReq req) {
        BigDecimal distance = minDistance.compareTo(req.getDistance()) > 0 ? minDistance : req.getDistance();

        return distance.multiply(req.getUnitPrice()).add(pickFee);
    }
}

/**
 * 实现类2
 */
@Component
public class YTTransferCompany implements LogisticsService {
    private final BigDecimal minDistance = BigDecimal.valueOf(40);

    private final BigDecimal pickFee = BigDecimal.TEN;

    @Override
    public boolean isCurrentLogistic(Integer type) {
        return Objects.equals(type, 1);
    }

    @Override
    public BigDecimal calculateFee(TransferFeeReq req) {
        BigDecimal distance = minDistance.compareTo(req.getDistance()) > 0 ? minDistance : req.getDistance();

        return distance.multiply(req.getUnitPrice()).add(pickFee);
    }
}

/**
* 工厂类
*/
@Service
public class LogisticsFactory {

    @Autowired
    private List<LogisticsService> logisticsServiceList;

    public LogisticsService getService(TransferFeeReq req) {
        Optional<LogisticsService> first =
                logisticsServiceList.stream().filter(l -> l.isCurrentLogistic(req.getType())).findFirst();

        if (first.isPresent()) {
            return first.get();
        }

        throw new RuntimeException("非法类型");
    }
}

/**
 * 使用方式
 */ 
@Test
    public  void test() {
        TransferFeeReq req = new TransferFeeReq(new BigDecimal(10), new BigDecimal(11), 2);

        LogisticsService logisticsService = logisticsFactory.getService(req);
        System.out.println(logisticsService.calculateFee(req));
    }