How to exclude annotation element if other is set

If I have annotation like this:

public @interface MyAnnotaton{

   String className():

   Class clazz();

}

what i sh开发者_StackOverflow中文版ould do to limit setting element className if element clazz is set?

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Provide a default value for one of the elements, and in your AnnotationProcessor code the necessary logic to detect which element should be processed

public @interface MyAnnotation {
   Class clazz();
   String className() default "<none>";
}

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I'd wager to say this is impossible – annotations aren't executable code and do not intrinsically have any logic. Either settle on one of the two, or pick which one takes precedence and document the annotation accordingly.