Mapstruct 'aftermapping' 未调用

Question

问题是，用 @AfterMapping 注释的方法根本没有被调用。来自 testToEntityMapping它转到 toEntity方法，但它不调用任何 toEntityAfterMapping()方法。为什么 ？是否可以 ？我如何使用 MapStruct 实现这一目标？

(这里我准备了一个没有意义的场景，但它完全捕获了我的问题的本质)
实体:

public class Ford {
    private String color;
    private String market;
    private int totalWidth;

    //getters and setters omitted for brevity
}

托斯:

public abstract class FordDto {
    public String market;
    public String color;

    //getters and setters omitted for brevity
}

public class EuropeanFordDto extends FordDto{
    private int totalWidth;

    public int getTotalWidth() {
        return totalWidth + 2;//"+2" for EU market
    }
    //setter omitted for brevity
}

public class AmericanFordDto extends FordDto{
    private int totalWidth;

    public int getTotalWidth() {
        return totalWidth + 1;//"+1" for US market
    }

    //setter omitted for brevity
}

映射器:

public abstract class FordMapper<D extends FordDto> {
    public Ford toEntity(D dto) {

        /* fill in fields common to both ford versions */

        final Ford ford = new Ford();

        ford.setColor(dto.getColor());
        ford.setMarket(dto.getMarket());

        return ford;
    }
}
@Mapper(componentModel = "spring")
public abstract class EuropeanFordMapper extends FordMapper<EuropeanFordDto> {

    @AfterMapping
    public void toEntityAfterMapping(final EuropeanFordDto dto, @MappingTarget final Ford entity) {

        /* Fill in fields related to european version of the ford */

        entity.setTotalWidth(dto.getTotalWidth());
    }
}
@Mapper(componentModel = "spring")
public abstract class AmericanFordMapper extends FordMapper<AmericanFordDto> {

    @AfterMapping
    public void toEntityAfterMapping(final AmericanFordDto dto, @MappingTarget final Ford entity) {

        /* Fill in fields related to american version of the ford */

        entity.setTotalWidth(dto.getTotalWidth());
    }
}

服务:

@Service
public class CarService {

    @Autowired
    private AmericanFordMapper americanFordMapper;
    @Autowired
    private EuropeanFordMapper europeanFordMapper;

    public void testToEntityMapping(final FordDto dto) {

        if (dto instanceof AmericanFordDto) {
            americanFordMapper.toEntity((AmericanFordDto) dto);
        } else {
            europeanFordMapper.toEntity((EuropeanFordDto) dto);
        }
    }
}

Answer 1

好吧，它比我想象的要简单。

public interface FordMapper<D extends FordDto> {
    
    @Mapping(target = "totalWidth", ignore=true)
    public abstract Ford toEntity(D dto);
}

您甚至可以查看 toEntity() 中的实现方法，有一个对 toEntityAfterMapping() 的调用，因此一切都是正确的，并且符合我们想要的结果。