How can I create a Map (it that's the best way) of having something for instance : 400 to CustomExce...

# getting-started

[Pablo]

How can I create a Map (it that's the best way) of having something for instance :
400 to CustomExceptionFor400
500 to CustomExceptionFor500

The first param is an Int and it's a HttpStatusCode, and the value is something like this

sealed class OrganizationExceptions : Exception() {
    object OrganizationNotFound : OrganizationExceptions()
    object ListNotAvailable : OrganizationExceptions()
}

This is an example, but it won't be always "OrganizationExceptions" I'm creating a method generic, also I don't know if it's better to create a sealed class or create

class OrganizationNotFoundException : Throwable() //or Exception()
class ListNotAvailable : Throwable() //or Exception()

Any recomendations?

the method signature is :

fun apiCallWithStatusCode(codes : HashMap<Int, Throwable>, apiCall : suspend () -> Response<T>,){...}

[Arjan van Wieringen]

Maybe I don't understand completely, but:

val codes = mapOf(
    400 -> OrganizationNotFound,
    500 -> CustomException(someData)
);

[Arjan van Wieringen]

?

[Pablo]

Yes, but what do I put in the generic method?

[James Whitehead]

Maybe something like:

fun <T : Exception> apiCallWithStatusCode(
    codes: HashMap<Int, T>,
    apiCall : suspend () -> Response<HashMap<Int, T>>
) {
    ...
}

[Michael de Kaste]

If you make the Throwable of your method signature to an out Throwable, maybe something like this?

interface ExceptionCodeMap {
    val codes: Map<Int, Throwable>
}

sealed class OrganizationExceptions : Exception(){
    object OrganizationNotFound : OrganizationExceptions()
    object ListNotAvailable : OrganizationExceptions()

    companion object : ExceptionCodeMap {
        override val codes = mapOf(
            400 to OrganizationNotFound,
            500 to ListNotAvailable
        )
    }
}

fun main(){
    apiCallWithStatusCode(OrganizationExceptions.codes){
        ...
    }
}

Also, maybe dont specify map implementation in the api, otherwise, instead of mapOf create a custom HashMap

[Michael de Kaste]

if you make the signature like so: fun <T : Throwable> apiCallWithStatusCode(codes: Map<Int, T>, apiCall : suspend () -> Response<T>,){...} you have access to the correct type T within the function

[Pablo]

If I have this

class MyCustomException : Throwable

[Pablo]

How can I return this MyCustomException in a method that gets a generic Throwable?

[Pablo]

@James Whitehead, @Michael de Kaste, @Arjan van Wieringen thanks for replying, I've created a StackOverflow question to make it clear, let me know if you can help me out!
https://stackoverflow.com/questions/70575219/how-to-add-generic-throwable-on-a-method-signature