【2016-10-15】【坚持学习】【Day6】【组合模式】

abstract class Component
    {
        public abstract void Add(Component c); //增加成员
        public abstract void Remove(Component c); //删除成员
        public abstract Component GetChild(int i); //获取成员
        public abstract void Operation();  //业务方法
    }

    class Leaf : Component
    {
        public override void Add(Component c)
        {
            //异常处理或错误提示 
        }

        public override void Remove(Component c)
        {
            //异常处理或错误提示 
        }

        public override Component GetChild(int i)
        {
            //异常处理或错误提示
            return null;
        }

        public override void Operation()
        {
            //叶子构件具体业务方法的实现
        }
    }

    class Composite : Component
    {
        private List<Component> list = new List<Component>();

        public override void Add(Component c)
        {
            list.Add(c);
        }

        public override void Remove(Component c)
        {
            list.Remove(c);
        }

        public override Component GetChild(int i)
        {
            return (Component)list[i];
        }

        public override void Operation()
        {
            //容器构件具体业务方法的实现，将递归调用成员构件的业务方法
            foreach (Object obj in list)
            {
                ((Component)obj).Operation();
            }
        }
    }