MapStruct：对象类的映射

Question

Class Source {
   private String type;
   private Object identifier;
}

标识符可以是 AppointmentIdentifier 或 JobIdentifier 类的对象； 我必须将 Source 映射到 Target，它具有以下结构。

Class Target {
    private String type;
    private Object identifierBO;
}

标识符BO 可以是AppointmentIdentifierBO 或JobIdentifierBO 类的对象。 下面是我的 Mapper 类：

@Mapper
public interface ModelMapper {

    Target toTarget(@NonNull final Source source);

    AppointmentIdentifierBO toAppointmentIdentifierBO(AppointmentIdentifier appointmentIdentifier);

    JobBO toJobBO(JobIdentifier jobIdentifier);
}

我知道，我缺少一些有助于将标识符映射到标识符BO 的配置，但我无能为力。

Answer 1

我只知道这样做的方法：

@Mapper
public interface ModelMapper {
    @Mapping(source = "identifier", target = "identifierBO", qualifiedByName = "identifierMapping")
    Target toTarget(Source source);

    @Named("identifierMapping")
    default Object mapIdentifier(Object obj) {
        if (obj instanceof AppointmentIdentifier)
            return toAppointmentIdentifierBO((AppointmentIdentifier) obj);

        if (obj instanceof JobIdentifier)
            return toJobBO((JobIdentifier) obj);

        throw new RuntimeException("Not supported type: " + obj.getClass());
    }

    AppointmentIdentifierBO toAppointmentIdentifierBO(AppointmentIdentifier appointmentIdentifier);

    JobBO toJobBO(JobIdentifier jobIdentifier);
}

可怕吗？是的。作品？是的。