Hi! I want to dynamically add (or replace) annotat...

# arrow-meta

[Cornelius Wichering]

Hi! I want to dynamically add (or replace) annotations to Methods. For example if I annotate a Method in my source like this:

@OneAnnotation(value = "someDetail")
fun methodA() { ... }

I want my plugin to add another annotation like this

@AnotherAnnotation(value = "someDetail") // value taken from "original" annotation
@OneAnnotation(value = "someDetail")
fun methodA() { ... }

Do you think arrow-meta is a good fit for this task? Any hints on how to do it?

[raulraja]

hi Cornelius, it depends on what you do later with AnotherAnnotation , you may be able to use just backend IR

[raulraja]

what happens after you add it?

[Cornelius Wichering]

I just want it to be there at runtime. I want a more elegant way to write annotations for spring security. Spring security seems not to be too flexible regarding custom annotations but wants us to write SpEL in @PreAuthorize annotations. So thought I could create my own annotations and generate the @PreAuthorize including the (imo ugly) SpEL expressions at compile time.

[raulraja]

if you use meta you can implement this with irDeclaration { decl.annotations... } or directly without meta using the IRGenerationExtension in the compiler apis.

[raulraja]

the ir declarations are mutable and whatever you change will make it to the codegen phase which will eventually add it to the compiled jar

[Cornelius Wichering]

Thanks, I will give it a try. Enjoy the weekend :)