C/O - Builder

• Category: Creational
• Type: object
• Motivation: to avoid too many parameters in constructor method (create object with several options)

do {
	let builder = CarBuilder()
	let director = Manufacturer(builder)
	director.makeSportCar()
	builder.car.description()
	/*
	Car:
	seats: true
	engine: true
	GPS: false
	*/
}

class Car
{
	var seats: Bool = false
	var engine: Bool = false
	var GPS: Bool = false
}

extension Car
{
	func description()
	{
		print("Car:")
		print("seats: \(seats)")
		print("engine: \(engine)")
		print("GPS: \(GPS)")
	}
}

protocol Builder
{
	func reset()
	func addSeats()
	func addEngine()
	func addGPS()
}

class CarBuilder: Builder
{
	var car = Car()

	func reset()
	{
		car = Car()
	}

	func addSeats() {
		car.seats = true
	}

	func addEngine() {
		car.engine = true
	}

	func addGPS() {
		car.GPS = true
	}
}

class Manufacturer
{
	let builder: Builder

	init(_ builder: Builder)
	{
		self.builder = builder

	}

	func makeSportCar()
	{
		builder.addSeats()
		builder.addEngine()
	}

	func makeSUV()
	{
		builder.addSeats()
		builder.addEngine()
		builder.addGPS()
	}
}