How to know if isNullable from VariableElement?

[universezy]

I got ExecutableElement from method, then I got list of VariableElement from ExecutableElement.parameters, for each VariableElement, how can I get that if the param is nullable with symbol "?" ?
If I try to "asType" or "asTypeName" for VariableElement, it returns a typeName with "isNullable" false always.
Please help me

[ZacSweers]

You would have to read the kotlin metadata from the enclosing class, find that corresponding KmFunction, and finally the KmParameter on that function.

[ZacSweers]

That's not a good way to do it, you should use metadata to be absolutely correct. You have no guarantee that that annotation will be there at runtime, nor does it propagate correctly with type arguments on generic functions. I'm unmarking that as an answer because we don't recommend users do that.

[universezy]

I got an ExecutableElement from the method in an existed Interface file and a list of VariableElement from the ExecutableElement, but there is no api to get any metadata, how can I do? Could you pls give some better suggestions? I had searched for it in docs and read source codes, but no idea.

[universezy]

You would have to read the kotlin metadata from the enclosing class, find that corresponding KmFunction, and finally the KmParameter on that function.

There is a property named "metadata" in class "com.sun.tools.javac.code.Symbol", did you mean it?
I guess I misunderstood what you said.

[ZacSweers]

I think you should look more closely, as it's the first result for "metadata" on the docs site

https://square.github.io/kotlinpoet/interop-kotlinx-metadata/

[universezy]

Ok, thx, I misunderstood it. I'll read it and bring the lib into my project.