java Mapstruct通用映射器

Question

我想知道在我的情况下如何避免干燥（不要重复）：

我想要两个映射器：一个将Road转换为RoadWithLUPlaceDto，另一个将Road转换为RoadWithLUPlaceSmallDtoRoadWithLUPlaceSmallDto的字段比RoadWithloUnPlaceDto的字段少。我不想让两个接口具有相同的qualifiedByName逻辑方法

RoadWithLUPlaceSmallDto有一个字段RoadAddressSmallDto，而不是RoadAddressDto，所以我不能重用qualifiedByName标记的相同方法。我该怎么做？可能吗

@Mapper(componentModel = "spring")
public interface MyMapper {

    @Mapping(target = "lPlace", source = "road", qualifiedByName = "PointToLPlace")
    @Mapping(target = "uPlace", source = "road", qualifiedByName = "PointTouPlace")
    RoadWithloUnPlaceDto map(Road road);

//    @Mapping(target = "loadingPlace", source = "road", qualifiedByName = "SpotToLPlace")
//    @Mapping(target = "uPlace", source = "road", qualifiedByName = "SpotTouPlace")
//    RoadWithLUPlaceSmallDto mapToRoadWithLUPlaceSmallDto(road road);

    @Named("PointToLPlace")
    default RoadAddressDto mapLPlace(Road road) {
        return Optional.ofNullable(road)
                .map(road::getPoints)
                .filter(point -> !CollectionUtils.isEmpty(points))
                .flatMap(
                        points-> points.stream()
                                .sorted(Comparator.comparing(Point::getOrder))
                                .filter(point-> isAllowed(point.getOperations(), OperationType.L))
                                .findFirst()
                ).map(this::mapRoadAddress)
                .orElse(null);
    }
...

Answer 1

MapStruct支持对@Mapping使用元注释。因此，在您的用例中，您可以执行以下操作：

@Retention(RetentionPolicy.CLASS)
@Mapping(target = "lPlace", source = "road", qualifiedByName = "PointToLPlace")
@Mapping(target = "uPlace", source = "road", qualifiedByName = "PointTouPlace")    
public @interface CommonRoadMapping { }

然后在你的地图中使用它

@Mapper(componentModel = "spring")
public interface MyMapper {

    @CommonRoadMapping
    RoadWithloUnPlaceDto map(Road road);

    @CommonRoadMapping
    RoadWithLUPlaceSmallDto mapToRoadWithLUPlaceSmallDto(road road);

    @Named("PointToLPlace")
    default RoadAddressDto mapLPlace(Road road) {
        return Optional.ofNullable(road)
                .map(road::getPoints)
                .filter(point -> !CollectionUtils.isEmpty(points))
                .flatMap(
                        points-> points.stream()
                                .sorted(Comparator.comparing(Point::getOrder))
                                .filter(point-> isAllowed(point.getOperations(), OperationType.L))
                                .findFirst()
                ).map(this::mapRoadAddress)
                .orElse(null);
    }
...