Swift Generic Factory

SwiftGenericFactory.swift

//
//  ViewController.swift
//  SwiftTest
//
//  Created by Josh Holtz on 8/3/14.
//  Copyright (c) 2014 Josh Holtz. All rights reserved.
//

import UIKit

class ViewController: UIViewController {
    
    override func viewDidLoad() {
        super.viewDidLoad()
        
        var a = Maker<A>().make();
        a?.talk() // Outputs "Aaaaaa"
        
        var b = Maker<B>().make();
        b?.talk() // Outputs "Bbbbbb"
        
        var c = Maker<C>().make();
        c?.talk() // Outputs "Cccccc"

        var d = Maker<D>().make();
        d?.talk() // Outputs "Dddddd"
    }

}

struct Maker<T:Base> {
    
    func make() -> T? {
        return self.dynamicType.bake()
    }
    
    private static func bake() -> T? {
        return T.create()
    }
}

protocol Base {
    init();
    func talk()
    
    class func create() -> Self;
}

class A: Base {
    required init() {}
    func talk() {
        println("Aaaaaa")
    }
    
    class func create() -> Self { return self() }
}

class B: Base {
    required init() {}
    func talk() {
        println("Bbbbbb")
    }
    
    class func create() -> Self { return self() }
}

class C: B {
    required init() {}
    override func talk() {
        println("Cccccc")
    }
    
    override class func create() -> Self { return self() }
}

class D: B, Base {
    required init() {}
    override func talk() {
        println("Dddddd")
    }
    
    override class func create() -> Self { return self() }
}