持有其他注释注释成员? [英] Annotation member which holds other annotations?
本文介绍了持有其他注释注释成员?的处理方法,对大家解决问题具有一定的参考价值,需要的朋友们下面随着小编来一起学习吧!
问题描述
我要创建(使用Java),这将接受其他注释作为参数自定义注解,是这样的:
I want to create a custom annotation (using Java) which would accept other annotations as parameter, something like:
public @interface ExclusiveOr {
Annotation[] value();
}
但是,这会导致编译器错误无效类型注释成员。
But this causes compiler error "invalid type for annotation member".
对象[]也不起作用。
有没有办法做我想做什么?
Is there a way to do what I want?
推荐答案
我自己在此提出一个解决办法对于给定的问题:
I myself hereby propose a workaround for the given problem:
那么,我想让可能是类似的东西:
Well, what I wanted to make possible was something like that:
@Contract({
@ExclusiveOr({
@IsType(IAtomicType.class),
@Or({
@IsType(IListType.class),
@IsType(ISetType.class)
})
})
})
建议的解决方法:
Proposed workaround:
在定义下列方式与无参数的构造函数的类(将通过自己的注释处理器后来被称为):
Define a class with parameter-less constructor (which will be called by your own annotation processor later) in following way:
final class MyContract extends Contract{
// parameter-less ctor will be handeled by annotation processor
public MyContract(){
super(
new ExclusiveOr(
new IsType(IAtomicType.class),
new Or(
new IsType(IListType.class),
new IsType(ISetType.class)
)
)
);
}
}
用法:
@Contract(MyContract.class)
class MyClass{
// ...
}
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