Java注释处理：可以访问非注释类的“元素”吗？

发布于 2024-10-01 00:29:43 字数 337 浏览 9 评论 0原文

Java 注释处理（自 Java 6 起）是一个非常好的概念，因为它允许通过 Element 接口（以及其他接口）访问有关类和方法的大量信息。

但遗憾的是，我必须凭经验发现，未注释的类永远不会传递给自定义注释处理器：

warning: No SupportedAnnotationTypes annotation found on
    my.TESTProcessor, returning an empty set.

我的发现是真的吗？或者我可以“欺骗”编译器来为我的自定义注释处理器提供有关非注释类的信息吗？

原文

Java annotation processing (since Java 6) is a very good concept, because it allows to access lots of information about classes and methods through the Element interface (and others).

But sadly, I had to find out empirically, that non-annotated classes are never passed to a custom annotation processor:

warning: No SupportedAnnotationTypes annotation found on
    my.TESTProcessor, returning an empty set.

Are my findings true? Or can I "trick" the compiler to give my custom annotation processor information about non-annotated classes as well?

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骄傲 2024-10-08 00:29:43

伟大的！

这给了我真正的所有类，而不仅仅是带注释的类：

@SupportedAnnotationTypes("*")

该注释的规范说：

[...] Finally, "*" by itself represents the set of all annotation types,
including the empty set. Note that a processor should not claim "*"
unless it is actually processing all files [...]

经过测试，有效！

Great!

This gives me really all classes, not just annotated ones:

@SupportedAnnotationTypes("*")

The spec of that anotation says:

[...] Finally, "*" by itself represents the set of all annotation types,
including the empty set. Note that a processor should not claim "*"
unless it is actually processing all files [...]

Tested, works!

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