Abstract Factory
protocol Decimal {
func stringValue() -> String
}
protocol NumberFactoryProtocol {
func numberFromString(string : String) -> Decimal
}
// Number implementations.
struct NextStepNumber : Decimal {
private var nextStepNumber : NSNumber
func stringValue() -> String { return nextStepNumber.stringValue }
}
struct SwiftNumber : Decimal {
private var swiftInt : Int
func stringValue() -> String { return "\(swiftInt)" }
}
// Factories.
class NextStepNumberFactory : NumberFactoryProtocol {
func numberFromString(string : String) -> Decimal {
return NextStepNumber(nextStepNumber:NSNumber(longLong:(string as NSString).longLongValue))
}
}
class SwiftNumberFactory : NumberFactoryProtocol {
func numberFromString(string : String) -> Decimal {
return SwiftNumber(swiftInt:(string as NSString).integerValue)
}
}
// Abstract factory.
enum NumberType {
case NextStep, Swift
}
class NumberAbstractFactory {
class func numberFactoryType(type : NumberType) -> NumberFactoryProtocol {
switch type {
case .NextStep:
return NextStepNumberFactory()
case .Swift:
return SwiftNumberFactory()
}
}
}let factoryOne = NumberAbstractFactory.numberFactoryType(.NextStep)
let numberOne = factoryOne.numberFromString("1")
numberOne.stringValue()
let factoryTwo = NumberAbstractFactory.numberFactoryType(.Swift)
let numberTwo = factoryTwo.numberFromString("2")
numberTwo.stringValue()