问题是,用 @AfterMapping
注释的方法根本不会被调用 . 从 testToEntityMapping
它转到 toEntity
方法,但它不会调用任何 toEntityAfterMapping()
方法 . 为什么?可能吗 ?如何使用MapStruct实现这一目标?
(在这里,我准备了一个毫无意义的场景,但它完全捕捉了我的问题的本质)
实体:
public class Ford {
private String color;
private String market;
private int totalWidth;
//getters and setters omitted for brevity
}
DTOS:
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);
}
}
}
1 回答
好吧,我觉得它更简单 .
您甚至可以查看
toEntity()
方法中的实现,有一个对toEntityAfterMapping()
的调用,因此一切都是正确的并且符合我们期望的结果 .