Is it possible to get a `Class<SomeEnumType>...

# announcements

[bbaldino]

Is it possible to get a Class<SomeEnumType> from a KType created elsewhere via typeOf<SomeEnumType>()? I feel like it should be possible, but I'm struggling to find the right call to get it.

[Zach Klippenstein (he/him) [MOD]]

KType.classifier as? KClass

[bbaldino]

Thanks (again!) Zach....I've gotta pass a type argument to KClass there, though, and all I could pass is <*>, no?

[bbaldino]

(Since I don't know what it is)

[bbaldino]

If I do println(type.classifier as? KClass<*>) It does print as the right type, but it assigns as KClass<*>

[Big Chungus]

as KClass<T>

[bbaldino]

I don't have a T here, unfortunately, just the KType

[Big Chungus]

T meaning your type

[Zach Klippenstein (he/him) [MOD]]

as KClass<*> if you don’t have the type

[bbaldino]

If the answer is I have to have a T, I might be able to work something out, but I wondered if I could get that from the KType

[Zach Klippenstein (he/him) [MOD]]

the actual classifier will be the KClass of your enum type

[bbaldino]

The problem is I'm calling a method which is defined as <T extends Enum<T>> T getEnum(Class<T> var1, String var2); so I have to get a Class<T> with <T extends Enum<T>>

[bbaldino]

I can do type.isSubtypeOf(typeOf<Enum<*>>()) to check that it is an enum

[Zach Klippenstein (he/him) [MOD]]

as KClass<Enum<*>>?

[bbaldino]

I tried that, but compiler still isn't happy

[Big Chungus]

Buy it some roses, see if that makes it happy 😄

[bbaldino]

image.png

[bbaldino]

Ha..if only that worked 🙂

[bbaldino]

val c = (type.classifier as KClass<Enum<*>>).java helps a little...

[bbaldino]

image.png

[bbaldino]

Maybe it would be better to create my own getEnum extension function for this class in Kotlin and do that. But now I'm even trying that and it's still eluding me. Is it possible given a String and a KType of an enum to create an instance of that enum using valueOf(someString) ?

[Zach Klippenstein (he/him) [MOD]]

I think you can also get the java Type of a KType, maybe that would help?

[bbaldino]

I played with that a bit...I think the recursive nature of the Enum type bounds makes things a bit weird.

[bbaldino]

Because I can get an Enum<*>, but because of how Enum type bounds are set, it wants the boundary to be T : Enum<Enum<T>> and it complains that Enum<*> isn't a subtype of Enum<Enum<*>>

[diesieben07]

Nothing helps you:
ktype.classifier as KClass<Nothing>

[bbaldino]

Wow! I just tried that...had no idea KClass<Nothing> would satisfy T : Enum<T>...that's pretty slick

[Zach Klippenstein (he/him) [MOD]]

Oh neat, that makes sense – Nothing is the bottom type, so it is a subtype of every possible type.

[bbaldino]

Yeah that's awesome...I had all but given up on this scenario, but I can test that it is some enum type using the KType and now cast it with a "T" I need using Nothing.