Mapstruct 映射空对象的属性

Question

我有一个特殊的问题来生成映射实现，我需要映射一个空对象的属性。 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);

    }

还有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 的映射并使用countryCode = "EN" 传递所有参数并且对象地址为空时，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

这种情况有办法解决吗？

谢谢

Answer 1

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

nullValueMappingStrategy = NullValueMappingStrategy.RETURN_DEFAULT