java - 如何从 Hibernate 的 @Any 中的值计算 @MetaValue 的 entityTarget？

Question

我已经实现了类似于以下内容的解决方案:
How to use Hibernate @Any-related annotations? ，而且它已经失控了 - 我有太多具有类似映射“方案”的映射:

@Any(metaColumn = @Column(name = "something_type"), fetch = FetchType.LAZY)
@AnyMetaDef(idType = "long", metaType = "string", metaValues = {
    @MetaValue(value = "A", targetEntity = AImpl.class),
    @MetaValue(value = "B", targetEntity = BImpl.class),
    @MetaValue(value = "C", targetEntity = CImpl.class),
    @MetaValue(value = "D", targetEntity = DImpl.class),
    @MetaValue(value = "E", targetEntity = EImpl.class),
    etc..  })
public BaseSomething getRelatedSometing() {
    return relatedSometing;
}

我试图保留一个可以计算到目标(例如“AImpl”)的值(例如“A”)。
有没有办法避免手动列出所有实现，但仍然保持 hibernate 状态？

Answer 1

I asked a similar question ，希望得到支持Spring style meta-annotations .

但是，与此同时，以下内容对我来说效果很好:

class SomeClass {
    public static final String SOMETHING_METADEF_NAME = "somethingMetadefName";


    @Any(metaColumn = @Column(name = "something_type"), fetch = FetchType.LAZY)
    @AnyMetaDef(idType = "long", metaType = "string", name=SomeClass.SOMETHING_METADEF_NAME,
    metaValues = {
            @MetaValue(value = "A", targetEntity = AImpl.class),
            @MetaValue(value = "B", targetEntity = BImpl.class),
            @MetaValue(value = "C", targetEntity = CImpl.class),
            @MetaValue(value = "D", targetEntity = DImpl.class),
            @MetaValue(value = "E", targetEntity = EImpl.class),
            etc..  })
    public BaseSomething getRelatedSometing() {
        return relatedSometing;
    }
}

    // Elsewhere
    @Any(metaColumn = @Column(name = "something_type"), fetch = FetchType.LAZY,
            metaDef=SomeClass.SOMETHING_METADEF_NAME)
    public BaseSomething getAnotherSomething() {
        return relatedSometing;
    }

具体来说，我定义了一次关系，并给它一个 name属性(property)在 @AnyMetaDef .然后，我可以从 @Any(metaDef=MY_NAME) 中引用它别处。

希望这可以帮助