Kotlin JSON parsing \o/

kotlinJSON.kt

// Usage

fun parse(json: JSONObject): Car {
    val car = Car()
    car.apply {
        ::id < json.key("id")
        ::numberOfDoors < json.key("nb_of_doors")
        ::driverName < json.key("driver_name")
    }
    return car
}

// JSON Kotlin Magick

fun JSONObject.key(key:String): Pair<JSONObject, String> = Pair(this, key)

inline operator fun <reified T>KMutableProperty0<T>.compareTo(pair: Pair<JSONObject, String>): Int {
    pair.first.map(this, pair.second)
    return 0
}

inline fun <reified T>JSONObject.map(property: KMutableProperty0<T>, key: String) {
    if (has(key)) {
         when (T::class) {
             String::class -> (property as? KMutableProperty0<String>)?.apply { set(getString(key)) }
             Long::class -> (property as? KMutableProperty0<Long>)?.apply { set(getLong(key)) }
             Double::class -> (property as? KMutableProperty0<Double>)?.apply { set(getDouble(key)) }
         }
    }
}