using System;

namespace AbstractFactory
{
    class AbstractFactory
    {
        /// <summary>
        /// 主程序
        /// </summary>
        /// <param name="args"></param>
        static void Main(string[] args)
        {
            ContinentFactory africa = new AfricaFactory();
            AnimalWorld world = new AnimalWorld(africa);
            world.RunFoodChain();
            ContinentFactory america = new AmericaFactory();
            world = new AnimalWorld(america);
            world.RunFoodChain();
            Console.ReadKey();
        }

        /// <summary>
        /// 食草动物
        /// </summary>
        abstract class Herbivore
        {
        }
        /// <summary>
        /// 野牛
        /// </summary>
        class Bison : Herbivore
        {
        }
        /// <summary>
        /// 羚羊
        /// </summary>
        class Wildebeest : Herbivore
        {
        }
        /// <summary>
        /// 食肉动物
        /// </summary>
        abstract class Carnivore
        {
            public abstract void Eat(Herbivore h);
        }
        /// <summary>
        /// 狮子
        /// </summary>
        class Lion : Carnivore
        {
            public override void Eat(Herbivore h)
            {
                Console.WriteLine(this.GetType().Name + " eats " + h.GetType().Name);
            }
        }
        /// <summary>
        /// 狼
        /// </summary>
        class Wolf : Carnivore
        {
            public override void Eat(Herbivore h)
            {
                Console.WriteLine(this.GetType().Name + " eats " + h.GetType().Name);
            }
        }
        /// <summary>
        /// 大陆工厂
        /// </summary>
        abstract class ContinentFactory
        {
            public abstract Herbivore CreateHerbivore();
            public abstract Carnivore CreateCarnivore();
        }
        /// <summary>
        /// 非洲大陆工厂
        /// </summary>
        class AfricaFactory : ContinentFactory
        {
            public override Herbivore CreateHerbivore()
            {
                return new Wildebeest();
            }
            public override Carnivore CreateCarnivore()
            {
                return new Lion();
            }
        }
        /// <summary>
        /// 美洲大陆工厂
        /// </summary>
        class AmericaFactory : ContinentFactory
        {
            public override Herbivore CreateHerbivore()
            {
                return new Bison();
            }
            public override Carnivore CreateCarnivore()
            {
                return new Wolf();
            }
        }
        /// <summary>
        /// 动物世界
        /// </summary>
        class AnimalWorld
        {
            private Herbivore _herbivore;
            private Carnivore _carnivore;
            public AnimalWorld(ContinentFactory factory)
            {
                _carnivore = factory.CreateCarnivore();
                _herbivore = factory.CreateHerbivore();
            }
　　　　　　　　
            public void RunFoodChain()
            {
                _carnivore.Eat(_herbivore);
            }
        }

    }
}