TypeScript实现设计模式——工厂模式

abstract class Pizza {
  public abstract show(): void;
  public abstract cut(): void;
}

class KFCPizza extends Pizza {
  public show(): void {
    console.log('This is KFCPizza!');
  }
  public cut(): void {
    console.log('Cut KFCPizza!');
  }
}

class MCPizza extends Pizza {
  public show(): void {
    console.log('This is MCPizza!');
  }
  public cut(): void {
    console.log('Cut MCPizza!');
  }
}

class PizzaFactory {
  /**
   * 静态工厂方法
   * @param pizzaType 限制传入的参数为类，而非类的实例
   */
  public static createPizza(pizzaType: new () => Pizza): Pizza {
    let pizza = null;

    try {
      pizza = new pizzaType();
    } catch (e) {
      console.error('Create failed!');
    }

    return pizza;
  }
}

let pizza = PizzaFactory.createPizza(KFCPizza);
pizza.show();

pizza = PizzaFactory.createPizza(MCPizza);
pizza.show();

abstract class Pizza {
  public abstract show(): void;
  public abstract cut(): void;
}

class KFCPizza extends Pizza {
  public show(): void {
    console.log('This is KFCPizza!');
  }
  public cut(): void {
    console.log('Cut KFCPizza!');
  }
}

class MCPizza extends Pizza {
  public show(): void {
    console.log('This is MCPizza!');
  }
  public cut(): void {
    console.log('Cut MCPizza!');
  }
}

abstract class PizzaFactory {
  public abstract createPizza(): Pizza;
}

class KFCPizzaFactory extends PizzaFactory {
  public createPizza(): Pizza {
    try {
      return new KFCPizza();
    } catch (error) {
      console.log(error);
    }
  }
}

class MCPizzaFactory extends PizzaFactory {
  public createPizza(): Pizza {
    try {
      return new MCPizza();
    } catch (error) {
      console.log(error);
    }
  }
}

let factory: PizzaFactory = new KFCPizzaFactory();
let pizza = factory.createPizza();
pizza.show();

// KFC产品父类
abstract class KFCPizza {
  public abstract show(): void;
  public abstract cut(): void;
}

// MC产品父类
abstract class MCPizza {
  public abstract show(): void;
  public abstract cut(): void;
}

// 具体KFCPizza类
class KFCFruitPizza extends KFCPizza {
  public show(): void {
    console.log('This is KFCFruitPizza!');
  }
  public cut(): void {
    console.log('Cut KFCFruitPizza!');
  }
}

class KFCCheesePizza extends KFCPizza {
  public show(): void {
    console.log('This is KFCCheesePizza!');
  }
  public cut(): void {
    console.log('Cut KFCCheesePizza!');
  }
}

// 具体KFCPizza类
class MCFruitPizza extends MCPizza {
  public show(): void {
    console.log('This is MCFruitPizza!');
  }
  public cut(): void {
    console.log('Cut MCFruitPizza!');
  }
}

class MCCheesePizza extends MCPizza {
  public show(): void {
    console.log('This is MCCheesePizza!');
  }
  public cut(): void {
    console.log('Cut MCCheesePizza!');
  }
}

abstract class PizzaFactory {
  public abstract createKFCPizza(): KFCPizza;
  public abstract createMCPizza(): MCPizza;
}

// 水果披萨工厂
class FruitPizzaFactory extends PizzaFactory {
  public createKFCPizza(): KFCPizza {
    try {
      return new KFCFruitPizza();
    } catch (error) {
      console.log(error);
    }
  }
  public createMCPizza(): MCPizza {
    try {
      return new MCFruitPizza();
    } catch (error) {
      console.log(error);
    }
  }
}

// 芝士披萨工厂
class CheesePizzaFactory extends PizzaFactory {
  public createKFCPizza(): KFCPizza {
    try {
      return new KFCCheesePizza();
    } catch (error) {
      console.log(error);
    }
  }
  public createMCPizza(): MCPizza {
    try {
      return new MCCheesePizza();
    } catch (error) {
      console.log(error);
    }
  }
}

let factory: PizzaFactory = new CheesePizzaFactory();
let cheesePizza = factory.createKFCPizza();
cheesePizza.show();