Mapstruct spring @ConditionalOnProperty @Conditional

Question

我有一个接口 EntityMapper 和其他几个扩展它的接口，如 EntityAMapper、EntityBMapper、EntityCMapper 等。每个子接口都用注释

@Mapper(config = EntityMapperConfig.class)

和

@ConditionalOnProperty(value = "propKey", havingValue = "propValue")

，其中 EntityMapperConfig 是：

@MapperConfig(componentModel = SPRING, mappingInheritanceStrategy = AUTO_INHERIT_FROM_CONFIG)
public interface EntityMapperConfig {
}

propValue

对于每种类型都有唯一的值 EntityAMapper、EntityBMapper、EntityCMapper 等

我需要在 Spring 上下文中最多存在一个（且只有一个）实现接口 EntityMapper 的 bean：根据 propKey 的值，其类型将是 EntityAMapper 或 EntityBMapper 或 EntityCMapper 等。

如何实现这一目标？ 是否可以让Mapstruct用@ConditionalOnProperty注释每个子类实现（EntityAMapperImpl，EntityAMapperImpl，EntityAMapperImpl等...）？

感谢您的帮助！

Answer 1

从 MapStruct 1.6.0.Beta1 开始，有一个新的注释

@AnnotateWith

，它允许您将注释传递给生成的代码。

根据您的情况，您可以执行以下操作：

@Mapper(config = EntityMapperConfig.class)
@AnnotateWith(value = ConditionalOnProperty.class, elements = [
    @AnnotateWith.Element(name = "value", strings = "propKey"),
    @AnnotateWith.Element(name = "havingValue", strings = "propAValue")
]}
public interface EntityAMapper extends EntityMapper {

}

@Mapper(config = EntityMapperConfig.class)
@AnnotateWith(value = ConditionalOnProperty.class, elements = [
    @AnnotateWith.Element(name = "value", strings = "propKey"),
    @AnnotateWith.Element(name = "havingValue", strings = "propBValue")
]}
public interface EntityBMapper extends EntityMapper {

}

@Mapper(config = EntityMapperConfig.class)
@AnnotateWith(value = ConditionalOnProperty.class, elements = [
    @AnnotateWith.Element(name = "value", strings = "propKey"),
    @AnnotateWith.Element(name = "havingValue", strings = "propCValue")
]}
public interface EntityCMapper extends EntityMapper {

}

这将生成如下代码：

@Component
@ConditionalOnProperty(value = "propKey", havingValue = "propAValue")
public class EntityAMapperImpl implements EntityAMapper {

}

@Component
@ConditionalOnProperty(value = "propKey", havingValue = "propBValue")
public class EntityBMapperImpl implements EntityBMapper {

}

@Component
@ConditionalOnProperty(value = "propKey", havingValue = "propCValue")
public class EntityCMapperImpl implements EntityCMapper {

}