Does kotlinpoet-metadata have functionality similar to the `Types` and `Elements` classes? There’s s...

# squarelibraries

[Sam Garfinkel]

Does kotlinpoet-metadata have functionality similar to the Types and Elements classes? There’s some reusable functionality that would be nice, such as an isSubtypeOf(t1: KmType, t2: KmType.

[Zac Sweers]

Are you often running into a case where you don't have the original Class or TypeElement first?

[Sam Garfinkel]

Yes. I am trying to check the supertype of primary constructor value parameters. I thought I could use the inspector to then extract the corresponding KmClass for the parameter type but the inspector is crashing when trying to resolve Kotlin primitives, such as kotlin.String, which makes sense because the Kotlin data types are mirrors of Java types.

[Sam Garfinkel]

The reason I don’t have the original TypeElement for these parameters is because I’m using the inspector to extract the primary constructor. As far as I know there’s no way to get the original ExecutableElement from a ImmutableKmConstructor

[Zac Sweers]

my memory is fuzzy, but ElementsInspector also will put the ExecutableElement in tags iirc

[Zac Sweers]

ehhh nvm, doesn’t look like we do. Seems a valid case though. Worst case though, you can look up the original element from its km signature

[Zac Sweers]

I don’t know if we want to add APIs vs just giving the original source elements and use the existing ones

[Zac Sweers]

we’d want to add tags in MethodData, then add the element here: https://github.com/square/kotlinpoet/blob/master/kotlinpoet-classinspector-elements/src/main/kotlin/com/squareup/kotlinpoet/classinspector/elements/ElementsClassInspector.kt#L527

[Sam Garfinkel]

Worst case though, you can look up the original element from its km signature

How do I do this? Would I be manually inspecting each constructor, then checking if the parameters are the same?

[Sam Garfinkel]

The separate issue is that just looking up an Element from the Kotlin class name doesn’t work reliably. There is no way to get a TypeMirror for Kotlin types such as kotlin.String .