检查注释是否属于特定类型 [英] Checking if an annotation is of a specific type

问题描述

我正在使用反射来查看附加到类属性的注释是否属于特定类型.目前我正在做:

I am using reflection to see if an annotation that is attached to a property of a class, is of a specific type. Current I am doing:

if("javax.validation.Valid".equals(annotation.annotationType().getName())) {
   ...
}

这让我觉得有点笨拙，因为它依赖于一个完全限定类名的字符串.如果命名空间在未来发生变化，这可能会导致细微的错误.

Which strikes me as a little kludgey because it relies on a string that is a fully-qualified class-name. If the namespace changes in the future, this could cause subtle errors.

我想做:

if(Class.forName(annotation.annotationType().getName()).isInstance(
     new javax.validation.Valid()
)) {
   ...
}

但是 javax.validation.Valid 是一个抽象类，不能被实例化.有没有办法针对接口或抽象类模拟 instanceof(或基本上使用 isInstance)?

But javax.validation.Valid is an abstract class and cannot be instantiated. Is there a way to simulate instanceof (or basically use isInstance) against an interface or an abstract class?

推荐答案

你只是在寻找

if (annotation.annotationType().equals(javax.validation.Valid.class)){}

?

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