批注未复制到getter和setter

Question

所以，我有了这个注释类

@Target(AnnotationTarget.PROPERTY_GETTER, AnnotationTarget.PROPERTY_SETTER, AnnotationTarget.PROPERTY)
@Retention(AnnotationRetention.RUNTIME)
annotation class MyTestAnnotation(val text: String)

interface MyTestInterface {

    @MyTestAnnotation("temp")
    var tempString: String
}

fun <T> with(myInterface: Class<T>): T {
    return Proxy.newProxyInstance(
        myInterface.classLoader,
        arrayOf<Class<*>>(myInterface),
        invocationHandler
    ) as T
}

private val invocationHandler = InvocationHandler { _, method, args ->
    Log.e("Called method:", method.name) // setTempString
    Log.e("declaredAnnotations", method.declaredAnnotations.size.toString()) // 0
    Log.e("annotations", method.annotations.size.toString()) // 0
    Log.e("args", args.size.toString()) // 1
}

val myInterface = with(MyTestInterface::class.java)
myInterface.tempString = "123"

Answer 1

可以指定批注的use-site目标。例如，如果您想同时注释setter和getter，可以这样做：

@set:YourAnnotation
@get:YourAnnotation
val aProperty: AType

官方文档:https://kotlinlang.org/docs/annotations.html#annotation-use-site-targets