Head First设计模式之解释器模式

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;

namespace DesignPatterns.Interpreter
{
    class Program
    {
        static void Main(string[] args)
        {
            Console.WriteLine(ReplyClient.ApplyContent("Y0001"));
            Console.WriteLine(ReplyClient.ApplyContent("y0002"));
            Console.WriteLine(ReplyClient.ApplyContent("N0003"));
            Console.WriteLine(ReplyClient.ApplyContent("n0004"));
        }
    }

    /// <summary>
    /// 回复内容
    /// </summary>
    public class ReplyContent
    {
        private string _ReplyText;

        public string ReplyText
        {
            get { return _ReplyText; }
            set { _ReplyText = value; }
        }
    }

    public abstract class InterPreter
    {
        public string ConvertContent(ReplyContent content)
        {
            if (content.ReplyText.Length == 0)
                return "请按规则回复审批短信.";
            return Excute(content.ReplyText);
        }

        public abstract string Excute(string key);
    }
    public class Approve : InterPreter
    {
        public override string Excute(string key)
        {
            if (key == "Y" || key == "y")
            {
                return "同意";
            }
            else if (key == "N" || key == "n")
            {
                return "拒绝";
            }
            else
            {
                return "回复内容有误,请重新回复.";
            }

        }
    }
    public class DocumentNum : InterPreter
    {
        public Dictionary<string, string> OddNum
        {
            get
            {
                Dictionary<string, string> OddID = new Dictionary<string, string>();
                OddID.Add("0001", "123890890892345");
                OddID.Add("0002", "123456717012345");
                OddID.Add("0003", "123456669012345");
                OddID.Add("0004", "123423444012345");
                OddID.Add("0005", "123467845345345");
                OddID.Add("0006", "123231234564345");
                OddID.Add("0007", "128797897867745");
                return OddID;
            }
        }

        public override string Excute(string key)
        {
            string value = null;
            if (OddNum.TryGetValue(key, out value))
            {
                return value;
            }
            else
            {
                return "没找到对应的单号.";
            }
        }
    }

    public class ReplyClient
    {
        public static string ApplyContent(string replayValue)
        {
            string result = string.Empty;
            string approvevalue = replayValue.Substring(0, 1);
            string oddIDvalue = replayValue.Substring(1, 4);

            ReplyContent content = new ReplyContent();
            content.ReplyText = approvevalue;
            InterPreter expression = new Approve();
            result = string.Format("你{0}", expression.ConvertContent(content));
            expression = new DocumentNum();
            content.ReplyText = oddIDvalue;
            result += string.Format("单号是{0}的申请.\n", expression.ConvertContent(content));
            return result;
        }
    }
}