Compile time check if parameter is annotated using Kotlin

Question

I have a requirement in my Android project where I need to validate an argument's annotation. For eg in below function, I need to ensure if block has the required annotation otherwise throw compilation error or lint error

fun doSomething(block : () -> Unit){}

1. Is there some annotation processing that could help me here
2. Or can lint check help me

Thank you.

Answer 1

To keep your code cleaner I would suggest to use lint checks, however there is a way to achieve this programatically.

You can use reflection on parameters.

val isAnnotated: Boolean = block::check.hasAnnotation<SomeAnnotation>()

if (!isAnnotated) throw Exception()