does kotlin have a magic fromString function for use with re kotlinlang #announcements

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Title

g

groostav

10/04/2019, 9:30 PM

does kotlin have a magic fromString function for use with reflection? I've got a

value: string

and a

KPropoperty1<*, T>

, and I'm certain that the

value

is a `toString()`'d version of

and that

is a common value type (eg

String

,

Double

, or

enum class

). Is there a handy way for me to convert from my

value

to an instance of the `KProperty`'s return type? I can write the switch but I sorta feel like somebody should've handled this for me. I've got both guava and apache commons on my classpath

fun KType.fromString(valueString: String) = when(val typeClassifier = classifier){
    Double::class -> {

    }
    String::class -> {

    }
    is KClass<*> -> {
        if(Enum::class.isSuperclassOf(typeClassifier)){
            
        }
        TODO()
    }
    else -> TODO("$valueString as $typeClassifier")
}

I could flesh that out but its a bunch of work

c

Casey Brooks

10/04/2019, 10:22 PM

There is no strong relationship between an object and what is returned from

toString

. You could have it return whatever you want, and in many cases

toString

is intended to return a human-readable String, but not a machine-readable one.

That said, maybe #serialization is what you’re looking for?

g

groostav

10/04/2019, 10:27 PM

yeah thats a good call, but I am thinking specificaly about java stack types, + string, + enums

all of which have bi-directional functinos built-in

(IE double.parseDouble() is a dual to double.toString()), similarly

Enum.valueOf()

and

enum.toString()

--assuming of course you have some side-channel to keep schema (IE the type

k

karelpeeters

10/04/2019, 11:22 PM

You could put your string in some json and use whatever lib to parse that, it'll handle all of the primitives and possibly dates. It's hacky, but what you're doing is hacky in the first place!

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