Abstract Factory Pattern Example

AbstractFactory.swift

//MARK: Abstract factory pattern

protocol AbstractProductA{

    func display() -> String
}

protocol AbstractProductB{
    
    func display() -> String
}

protocol AbstractFactory{

    func product1() -> AbstractProductA
    func product2() -> AbstractProductB
}

class ConcreteProductOneA: AbstractProductA {
    
    func display() -> String {
        
        return "Concrete product A 1"
    }
    
}

class ConcreteProductOneB: AbstractProductB {
    
    func display() -> String {
        
        return "Concrete product B 1"
    }
    
}

class ConcreteProductTwoA: AbstractProductA {
    
    func display() -> String {
        
        return "Concrete product A 2"
    }
    
}

class ConcreteProductTwoB: AbstractProductB {
    
    func display() -> String {
        
        return "Concrete product B 2"
    }
    
}

class ConcreteFactoryOne: AbstractFactory {
    
    func product1() -> AbstractProductA {
    
        return ConcreteProductOneA()
        
    }
    
    func product2() -> AbstractProductB {
    
        return ConcreteProductOneB()
    }
    
}

class ConcreteFactoryTwo: AbstractFactory {
    
    func product1() -> AbstractProductA {
        
        return ConcreteProductTwoA()
        
    }
    
    func product2() -> AbstractProductB {
        
        return ConcreteProductTwoB()
    }
    
}


//MARK: Use of the Abstract factory pattern


var factory: AbstractFactory = ConcreteFactoryOne()
var productA: AbstractProductA = factory.product1()
var productB: AbstractProductB = factory.product2()

print(productA.display())
print(productB.display())

factory = ConcreteFactoryTwo()
productA = factory.product1()
productB = factory.product2()

print(productA.display())
print(productB.display())