iamcrypticcoder

import Foundation

public class Shape {
    
    let graphicsApi: GraphicsAPI
    
    init(_ graphicsApi: GraphicsAPI) {
        self.graphicsApi = graphicsApi
    }
    

iamcrypticcoder

import Foundation

protocol GraphicsAPI {
    func drawRectangle(_ x: Int, _ y: Int, _ width: Int, _ height: Int)
    func drawCircle(_ x: Int, _ y: Int, _ radius: Int)
}

class DirectXAPI : GraphicsAPI {
    
    func drawRectangle(_ x: Int, _ y: Int, _ width: Int, _ height: Int) {

iamcrypticcoder

import Foundation

public class Circle : Shape {
    var x: Int = 0
    var y: Int = 0
    var radius: Int = 0
    
    convenience init(_ x: Int, _ y: Int, _ radius: Int, _ graphicsApi: GraphicsAPI) {
        self.init(graphicsApi)
        self.x = x

iamcrypticcoder

import Foundation

let DEMO_TEXT: String = "My Name is Mahbub. I like to use design pattern as much as possible because design patterns helps to write scalable code."

let ethernetConn: EthernetConnection = EthernetConnection()
let mobileDataConn: MobileDataConnection = MobileDataConnection()

var adapter: ThunderboltAdapter = ThunderboltAdapter(ethernetConn)
adapter.sendData(DEMO_TEXT)

iamcrypticcoder

class ThunderboltAdapter {
    var connection: Connection
    
    init(_ connection: Connection) {
        self.connection = connection
    }
    
    func sendData(_ data: String) {
        
        if connection is EthernetConnection {

iamcrypticcoder

class EthernetConnection : Connection {
    
    func makeReady() {
        print("Making Ethernet Ready...")
    }
    
    func isReady() -> Bool {
        return arc4random_uniform(2) == 0
    }
    

iamcrypticcoder

import Foundation

protocol Connection {
    func makeReady() -> Void
    func isReady() -> Bool
    func sendPacket(_ data: String) -> Void
}

iamcrypticcoder

let guiBuilder: GUIBuilder = GUIBuilder(platform: "Windows")

let window: Window = guiBuilder.buildWindow()
window.setTitle("Mahbub")
window.show()

let button: Button = guiBuilder.buildButton()
button.setTitle("Connect")
button.show()

iamcrypticcoder

class GUIBuilder {
    private var platform: String
    private var guiFactory: AbstractGUIFactory?
    
    init(platform: String) {
        self.platform = platform
    }
    
    func initGuiFactory() -> Void {
        if nil != guiFactory { return }

iamcrypticcoder

class WinFactory : AbstractGUIFactory {
    func createButton() -> Button {
        return WinButton()
    }
    
    func createWindow() -> Window {
        return WinWindow()
    }
}