using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;

namespace Demo.BLL
{
    #region 调用
    public class Demo
    {
        public void Test()
        {
            ITimeProvider timeProvider = (new Assembler()).Create<ITimeProvider>();
            Client _client = new Client();
            _client.timeProvider = timeProvider;
            Console.WriteLine(_client.GetYear());
            Console.WriteLine(_client.GetDatetime());


            //setterInjection
            IServiceClass serviceA = new ServiceClassA();
            IServiceClass serviceB = new ServiceClassB();
            ClientClass client = new ClientClass();

            client.Set_ServiceImpl(serviceA);
            client.ShowInfo();
            client.Set_ServiceImpl(serviceB);
            client.ShowInfo();
            Console.ReadLine();

        }
    } 
    #endregion

    #region 属性接口

    public interface ITimeProvider
    {
        DateTime CurrentDate { get; }
        string CurrentYear { get; }
    }
    public class TimeProvider : ITimeProvider
    {
        public DateTime CurrentDate { get { return DateTime.Now; } }
        public string CurrentYear { get { return DateTime.Now.Year.ToString(); } }
    }
    public class Assembler
    {
        private static Dictionary<Type, Type> dictionary = new Dictionary<Type, Type>();
        public Assembler()
        {
            dictionary.Add(typeof(ITimeProvider), typeof(TimeProvider));
        }
        public object Create(Type type)
        {
            if (type == null || !dictionary.ContainsKey(type)) throw new NullReferenceException();
            Type targetType = dictionary[type];
            return Activator.CreateInstance(targetType);
        }

        public T Create<T>()
        {
            return (T)Create(typeof(T));
        }
    }
    public class Client
    {
        public ITimeProvider timeProvider { get; set; }
        public string GetYear()
        {
            return timeProvider.CurrentYear.ToString();
        }
        public string GetDatetime()
        {
            return timeProvider.CurrentDate.ToString();
        }
    }
    #endregion

    #region 方法接口

    internal interface IServiceClass
    {
        string ServiceInfo();
    }
    internal class ServiceClassA : IServiceClass
    {
        public string ServiceInfo()
        {
            return "我是ServceClassA";
        }
    }
    internal class ServiceClassB : IServiceClass
    {
        public string ServiceInfo()
        {
            return "我是ServceClassB";
        }
    }
    internal class ClientClass
    {
        private IServiceClass _serviceImpl;
        public void Set_ServiceImpl(IServiceClass serviceImpl)
        {
            this._serviceImpl = serviceImpl;
        }

        public void ShowInfo()
        {
            Console.WriteLine(_serviceImpl.ServiceInfo());
        }
    }
    #endregion
}

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