smtion

abstract class EnumConverter<in V, E: Enum<E>>(
        private val valueMap: Map<V, E>
) {
    fun fromValue(value: V): E? = valueMap[value]
    fun fromValue(value: V?, default: E): E = valueMap[value] ?: default
}

inline fun <V, reified E: Enum<E>> buildValueMap(keySelector: (E) -> V): Map<V, E> =
        enumValues<E>().associateBy(keySelector)