java - Mapstruct 映射空对象的属性

Question

我在生成映射实现时遇到一个特殊问题，我需要映射空对象的属性。 ObjectRequestMapper中的代码是这样的:

    @Mapper(collectionMappingStrategy = CollectionMappingStrategy.ADDER_PREFERRED, nullValueCheckStrategy =
           NullValueCheckStrategy.ALWAYS, nullValueMappingStrategy = NullValueMappingStrategy.RETURN_NULL, uses = {
           WrapperGrpcMapper.class, AddressRequestMapper.class })
    public interface ObjectRequestGrpcMapper {

      @Mapping(target = "wcsStoreId", source = "storeId")
      @Mapping(target = "linesList", source = "lines")
      ObjectRequest map(Long storeId, @Context String countryCode, List<ObjectLines> lines, Address address);

      ObjectRequestLine lineToProto (ObjectLine line);

    }

和AddressRequestMapper:

    public interface AddressRequestMapper {

      default Address toProto(Address address, @Context String countryCode){
          return this.map(address, countryCode);
      }

      Address map(Address address, String countryCode);
    }

当我调用 ObjectRequest 的映射并通过 countryCode = "EN" 传递所有参数并且对象地址为 null 时，AddresRequestMapper 的映射器不适用，因为 ObjectRequestMapper 检查 Address == null，然后不将 ObjectRequest.Address 映射到地址

这种情况有可能得到解决方案吗？

谢谢

Answer 1

如果您需要获取而不是“Address == null”->“new Address()”，只需更改:

nullValueMappingStrategy = NullValueMappingStrategy.RETURN_DEFAULT