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kotlinlang

Hi, I've been trying to get Mapstruct plugin work for kotlin, so far I'm stucked to getting the return type of the function. How do i get `KtNamedFunction` 's return type in form like "`xxx.xxx.TestClass`"? I've only managed to get the short class name as "`TestClass`" with code like this:
```ktNamedFunction.getTypeReference().getText()```
And here's Mapstruct plugin in Github: <https://github.com/mapstruct/mapstruct-idea>

Hey, you can use `BindingContext` to retrieve function descriptor and get the `KotlinType` from there. 
Then you can use it to retrieve class descriptor which contains fqName field you need :)
I am away from the laptop now, but can provide more info later, if needed :)

<@UJNU95VNC> thx for your reply, how can i get `BindingContext` in `PsiReferenceProvider`? Here's example code:
```public class MappingTargetReferenceProviderKotlin extends PsiReferenceProvider {

  @NotNull
  @Override
  public PsiReference[] getReferencesByElement(@NotNull PsiElement element, @NotNull ProcessingContext context) {
    KtNamedFunction ktNamedFunction = PsiTreeUtil.getParentOfType(element, KtNamedFunction.class)
    KtTypeReference ktTypeReference = ktNamedFunction.getTypeReference();
    // TODO get BindingContext here
  }
}```

Screen Shot 2020-08-05 at 5.49.14 PM.png

Well... I got `UnresolvedType` from following code, what have i missed?
```KtNamedFunction ktFun = PsiTreeUtil.getParentOfType(element, KtNamedFunction.class)
BindingContext bindingContext = ResolutionUtils.analyze(ktFun, BodyResolveMode.FULL);
KotlinType type = bindingContext.get(BindingContext.FUNCTION, ktFun).getReturnType();```


Hey, sorry, I was a bit busy couple of last days, did get to read this slack much
Is your function / type correct from syntax perspective?
Also I didn't realize you are working from IDE side, I think there should be an easier way of doing these things, let me check

Hm, seems like you've done everything right :slightly_smiling_face:
Also a tip regarding performance, you maybe don't want to  resolve the whole body, only the top declaration (see `BodyResolveMode`)

IDE also has `KtNamedFunction.resolveToDescriptorIfAny`, which seems to do similar things, but maybe it works better ¯\_(ツ)_/¯

Thank u for your advice, I'll continue looking into this :thinking_face:

Well... turns out I got `UnresolvedType` because the return type isn't exactly a `KotlinType`, it's a Java type. But how can I get a Java return type from `KtNamedFunction`? Any idea  <@UJNU95VNC>?

Quite interesting,  Kotlin should transform those types in a similar way. Did not encounter such thing before :slightly_smiling_face:
Are you sure plugin is aware of Java sources / classes you are resolving?

Screen Shot 2020-08-11 at 3.56.38 PM.png

Uh... I can't really tell if the plugin is aware of Java classes under the circumstance. But I made Java version test of it (with `PsiMethod` approach), and either Java class or Kotlin class is resolved correctly.