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#reflect
- o
orangy
03/12/2016, 5:01 PMExposing metadata API is very useful for various tools, indeed. I know it from my CLR time simple smile - u
udalov
03/12/2016, 8:55 PM@vmironov: very interesting, thanks! I'll think what we can do, I've created an issue: https://youtrack.jetbrains.com/issue/KT-11386 - v
vmironov
03/12/2016, 9:08 PMcool, thanks - v
vmironov
03/21/2016, 9:46 AMQ: Does kotlin compiler optimize methods references the same way it optimizes delegated properties? The following code results in two extra classes (which are completely the same) with 7 methods each:Copy codeclass A { fun f(value: Int) = 42 } fun main(args: Array<String>) { val first = A::f val second = A::f } - u
udalov
03/21/2016, 9:47 AM - v
vmironov
03/21/2016, 9:48 AMgreat, voted - u
udalov
03/23/2016, 1:44 PMCurrently the only way to obtain a
from aKClass
is rather complicated because it requires Java reflectionKType - u
udalov
03/23/2016, 1:44 PMyou should get the Java
first, and then consider different cases of types which appear in Java reflectionType - a
aaverin
03/23/2016, 1:45 PMIsn't any type is class in the end? - u
udalov
03/23/2016, 1:45 PMthe simple case is when that type is just a
, in which case you just callClass
to get a.kotlinKClass - a
aaverin
03/23/2016, 1:45 PMI am walking my object reflectively, and would like to get a KClass for a property - a
aaverin
03/23/2016, 1:45 PMcurrectly KProperty.returnType is KType - u
udalov
03/23/2016, 1:45 PMother cases are TypeVariable, WildCardType, ParameterizedType and GenericArrayType - u
udalov
03/23/2016, 1:46 PMCopy codeval type = ktype.javaType when (type) { is Class -> type.kotlin is ParameterizedType -> (type.ownerType as Class<*>).kotlin … } - u
udalov
03/23/2016, 1:46 PMI think @apatrida may have the full implementation already somewhere - u
udalov
03/23/2016, 1:47 PMyes, any type is a class at the end, but there are also types which do not represent classes per se, e.g.:Copy codefun <T> foo(t: T): T = … - u
udalov
03/23/2016, 1:47 PM`foo`’s return type would be a TypeVariable instance in Java reflection - u
udalov
03/23/2016, 1:48 PMsimilarly for other cases I mentioned - u
udalov
03/23/2016, 1:48 PMso currently you should write custom code depending on what you want to do with such types (type variables, wildcards and generic types) - u
udalov
03/23/2016, 1:48 PMthe proper API on KType is of course planned - a
aaverin
03/23/2016, 1:49 PMI see, thanks - a
aaverin
03/23/2016, 1:50 PMAnother issue I have is that KProperty.annotations seems to always be empty - a
aaverin
03/23/2016, 1:58 PMI have a data class with some fields annotated with custom annotations, but trying to read those reflectively always returns an empty array - u
udalov
03/23/2016, 2:25 PMcan you show an example? - u
udalov
03/23/2016, 2:25 PMare they runtime-retained? - a
aaverin
03/23/2016, 3:56 PMUntitled.groovy - a
aaverin
03/23/2016, 3:56 PM@udalov: - u
udalov
03/23/2016, 3:59 PMthe issue here is that the annotation is only applied to the constructor parameter - u
udalov
03/23/2016, 3:59 PMif you want the annotation to appear on a property instead, provide a use-site annotation target:@property:GraphQLObject var body: String = “" - a
aaverin
03/23/2016, 8:19 PMHmm, didn't see it anywhere in documentation