Design pattern學習 – 5 (Factory工廠模式)

提供一個工廠介面，將產生實體的程式碼交由子類別各自實現。

簡單工廠模式和工廠模式比較:

簡單工廠模式的工廠直接負責所有產品的生產工作，利用if else或switch case來判斷生產哪一個產品。

工廠模式下的工廠提升為一個概念，實際上管理產品生產工作的是實作工廠概念的實體工廠。

	// Product and Concrete Product
	protocol Adventurer {
	func getType() -> String
	}

	class Archer: Adventurer {
	func getType() -> String {
	print("I'm an archer")
	return String(describing: Archer.self)
	}
	}

	class Warrior: Adventurer {
	func getType() -> String {
	print("I'm a warrior")
	return String(describing: Warrior.self)
	}
	}

	// Factory and Concrete Factory
	protocol TrainingCamp {
	func trainAdventurer() -> Adventurer
	}

	class ArcherTrainingCamp: TrainingCamp {
	func trainAdventurer() -> Adventurer {
	print("Train an archer")
	return Archer()
	}
	}

	class WarriorTrainingCamp: TrainingCamp {
	func trainAdventurer() -> Adventurer {
	print("Train an warrior")
	return Warrior()
	}
	}
	let archer = ArcherTrainingCamp().trainAdventurer()
	let warrior = WarriorTrainingCamp().trainAdventurer()

	// Testing code
	assert(archer is Archer, "Didn't get the archer object!!")
	assert(warrior is Warrior, "Didn't get the warrior object!!")

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