README.md

Facade

Provide a unified interface to a set of interfaces in a subsystem. Facade defines a higher-level interface that makes the subsystem easier to use.

Source: wikipedia.org

Swift Example

enum Eternal {

    static func set(_ object: Any, forKey defaultName: String) {
        let defaults: UserDefaults = UserDefaults.standard
        defaults.set(object, forKey:defaultName)
        defaults.synchronize()
    }

    static func object(forKey key: String) -> AnyObject! {
        let defaults: UserDefaults = UserDefaults.standard
        return defaults.object(forKey: key) as AnyObject!
    }

}

Swift Usage

Eternal.set("Disconnect me. I’d rather be nothing", forKey:"Bishop")
Eternal.object(forKey: "Bishop")

Kotlin Example

class ComplexSystemStore(val filePath: String) {

    init {
        println("Reading data from file: $filePath")
    }

    val store = HashMap<String, String>()

    fun store(key: String, payload: String) {
        store.put(key, payload)
    }

    fun read(key: String): String = store[key] ?: ""

    fun commit() = println("Storing cached data: $store to file: $filePath")
}

data class User(val login: String)

//Facade:
class UserRepository {
    val systemPreferences = ComplexSystemStore("/data/default.prefs")

    fun save(user: User) {
        systemPreferences.store("USER_KEY", user.login)
        systemPreferences.commit()
    }

    fun findFirst(): User = User(systemPreferences.read("USER_KEY"))
}

Kotlin Usage

fun main(args: Array<String>) {
    val userRepository = UserRepository()
    val user = User("dbacinski")
    userRepository.save(user)
    val resultUser = userRepository.findFirst()
    println("Found stored user: $resultUser")
}