java - 使用 ObjectFactory 时 Mapstruct 无法映射属性

Question

我需要一些社区帮助来指出我的代码中的错误...:)

我尝试在@ObjectFactory的帮助下使用mapstruct来映射两个实体之间的字段。

实体1:

public class ScimUser   {

    @JsonProperty("addresses")
    @Valid
    private List<UserAddress> addresses = null;

}

实体2:

public class User   {

    @JsonProperty("postalAddress")
    private PostalAddress postalAddress = null;

}

映射器:

@Mapper(componentModel = "spring", uses = { AddressFactory.class })
public interface ScimUserMapper {

    @Mapping(target = "postalAddress", source = "scimUser.addresses")
    User toUser(ScimUser scimUser);

    @Mapping(target = "addresses", source = "user.postalAddress")
    ScimUser toScimUser(User user);

}

对象工厂:

@Component
public class AddressFactory {

    @Autowired
    private CountryMapper countryMapper;

    @Autowired
    private CountryRepository countryRepository;

    @ObjectFactory
    public PostalAddress toPostalAddress(List<UserAddress> addresses, @TargetType Class<PostalAddress> type) {
        PostalAddress postalAddress = new PostalAddress();
        if (addresses != null && !addresses.isEmpty()) {
            UserAddress userAddress = addresses.stream().filter(UserAddress::isPrimary).findFirst().orElse(null);
            if (userAddress == null) {
                userAddress = addresses.get(0);
            }
            postalAddress.setAddressLine1(userAddress.getStreetAddress());
            postalAddress.setPostCode(userAddress.getPostalCode());
            postalAddress.setState(userAddress.getRegion());
            postalAddress.setCity(userAddress.getLocality());
            CountryJpa countryJpa = countryRepository.getCountryByIso2Code(userAddress.getCountry());
            if (countryJpa != null) {
                Country country = countryMapper.fromJPA(countryJpa);
                postalAddress.setCountry(country);
            }
        }
        return postalAddress;
    }

    @ObjectFactory
    public List<UserAddress> toUserAddressList(PostalAddress address, @TargetType Class<List<UserAddress>> type) {
        UserAddress userAddress = new UserAddress();
        userAddress.setCountry(address.getCountry().getIso2());
        userAddress.setFormatted("?");
        userAddress.setLocality(address.getCity());
        userAddress.setPostalCode(address.getPostCode());
        userAddress.setPrimary(true);
        userAddress.setRegion(address.getState());
        userAddress.setStreetAddress(address.getAddressLine1());
        userAddress.setType("?");

        return Collections.singletonList(userAddress);
    }

}

上面的代码在源代码生成过程中出现此错误:

无法将属性“java.util.List 地址”映射到“PostalAddress postalAddress”。考虑声明/实现一个映射方法:“PostalAddress map(java.util.List value)”。无法将属性“PostalAddress postalAddress”映射到“java.util.List 地址”。考虑声明/实现一个映射方法:“java.util.List map(PostalAddress value)”。

这不是我第一次在使用这些对象工厂时遇到困难，而且我真的不明白我做错了什么。

因此，如果有人有想法，我很乐意阅读。 :)

Answer 1

您使用的@ObjectFactory是错误的。您想要实现的是自定义映射方法。

@ObjectFactory 需要用于创建目标实例对象。在您的情况下，如果您只是从方法中删除 @ObjectFactory 和 @TargetType 那么它应该可以正常工作。

我必须强调，您在那里做了相当多的手动映射。您可以轻松提供在单个 UserAddress 和 PostalAddress 之间进行映射的方法，并且只需为集合添加包装器即可。