How to obtain all subclasses of a given sealed class?

Question

Recently we upgraded one of our enum class to sealed class with objects as sub-classes so we can make another tier of abstraction to simplify code. However we c

Answer 1

Full example:

sealed class State{
    companion object {
        fun find(state: State) =
            State::class.sealedSubclasses
                    .map { it.objectInstance as State}
                    .firstOrNull { it == state }
                    .let {
                        when (it) {
                            null -> UNKNOWN
                            else -> it
                        }
                    }
    }
    object StateA: State()
    object StateB: State()
    object StateC: State()
    object UNKNOWN: State()

}