大话设计模式读书笔记5——装饰模式

    /// <summary>
    /// 声明一个Component的抽象基类
    /// </summary>
    abstract class Component
    {
        public abstract void Operation();
    }

    /// <summary>
    ///声明一个具体的Component，继承Component
    /// </summary>
    class ConcreteComponent : Component
    {
        public override void Operation()
        {
            Console.WriteLine("ConcreteComponent.Operation()");
        }
    }

    /// <summary>
    /// 声明一个抽象的装饰类‘Decorator‘
    /// 并继承Component
    /// </summary>
    abstract class Decorator : Component
    {
        protected Component component;

        //装饰方法
        public void SetComponent(Component component)
        {
            this.component = component;
        }

        //重写 Operation 方法
        public override void Operation()
        {
            if (component != null)
            {
                component.Operation();
            }
        }
    }

    /// <summary>
    /// 声明一个具体装饰类A，继承Decorator
    /// </summary>
    class ConcreteDecoratorA : Decorator
    {
        public override void Operation()
        {
            //一些功能扩展
            Console.WriteLine("ConcreteDecoratorA.Operation()");
            base.Operation();            
        }
    }

    /// <summary>
    /// 声明一个具体装饰类B，继承Decorator
    /// </summary>
    class ConcreteDecoratorB : Decorator
    {
        public override void Operation()
        {
           //一些功能扩展
            AddedBehavior();
            Console.WriteLine("ConcreteDecoratorB.Operation()");
            base.Operation();
        }

        //装饰类B自有方法
        void AddedBehavior()
        {
        }
    }

 class Program
    {
        static void Main(string[] args)
        {  
            ConcreteComponent c = new ConcreteComponent();
            ConcreteDecoratorA d1 = new ConcreteDecoratorA();
            ConcreteDecoratorB d2 = new ConcreteDecoratorB();
           
            d1.SetComponent(c);
            d2.SetComponent(d1);
            d2.Operation();
           
            Console.ReadKey();
        }
    }

 //坦克基类
    public class Tank
    {
        /// <summary>
        /// 射击
        /// </summary>
        public virtual void Shoot()
        {

        }

    }

    //T50 型坦克
    public class T50Tank:Tank
    {
        public override void Shoot()
        {
            Console.WriteLine("T50 型号坦克射击");
        }
    }

    //T51型坦克
    public class T51Tank : Tank
    {
        public override void Shoot()
        {
            Console.WriteLine("T51 型号坦克射击");
        }
    }

    //装饰基类
    public abstract class Decorator : Tank
    {
        protected Tank tank;

        //利用构造器进行装饰
        public Decorator(Tank tank)
        {
            this.tank = tank;
        }          

        public override void Shoot()
        {
            if (tank != null)
            {
                tank.Shoot();
            }
        }
    }

    //具有红外功能
    public class InfraRed : Decorator
    {
        public InfraRed(Tank tank)
            : base(tank)
        {

        }
    
        public override void Shoot()
        {
            Console.WriteLine("带红外功能");
            base.Shoot();
        }
    }

    //具有GPS功能
    public class GPS : Decorator
    {
        public GPS(Tank tank)
            : base(tank)
        {

        }
        public override void Shoot()
        {
            Console.WriteLine("带GPS功能");
            base.Shoot();
        }
    }

 class Program
    {
        static void Main(string[] args)
        {
            //声明一个T50型坦克
            Tank t50Tank = new T50Tank();
            //给T50型坦克赋予红外功能
            InfraRed red = new InfraRed(t50Tank);
            //给T50型坦克赋予GPS功能
            GPS gps = new GPS(red);
            gps.Shoot();          

            Console.ReadKey();
        }
    }