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乐在其中设计模式(C#) - 解释器模式(Interpreter Pattern)
作者:webabcd
介绍
给定一个语言, 定义它的文法的一种表示,并定义一个解释器,该解释器使用该表示来解释语言中的句子。
示例
有一个Message实体类,某个类对它的操作有Get()方法。现在要求用具有某一规则的中文语法来执行这个操作。
MessageModel
using System;
using System.Collections.Generic;
using System.Text;
namespace Pattern.Interpreter
{
/// <summary>
/// Message实体类
/// </summary>
public class MessageModel
{
/// <summary>
/// 构造函数
/// </summary>
/// <param name="msg">Message内容</param>
/// <param name="pt">Message发布时间</param>
public MessageModel(string msg, DateTime pt)
{
this._message = msg;
this._publishTime = pt;
}
private string _message;
/// <summary>
/// Message内容
/// </summary>
public string Message
{
get { return _message; }
set { _message = value; }
}
private DateTime _publishTime;
/// <summary>
/// Message发布时间
/// </summary>
public DateTime PublishTime
{
get { return _publishTime; }
set { _publishTime = value; }
}
}
}
using System.Collections.Generic;
using System.Text;
namespace Pattern.Interpreter
{
/// <summary>
/// Message实体类
/// </summary>
public class MessageModel
{
/// <summary>
/// 构造函数
/// </summary>
/// <param name="msg">Message内容</param>
/// <param name="pt">Message发布时间</param>
public MessageModel(string msg, DateTime pt)
{
this._message = msg;
this._publishTime = pt;
}
private string _message;
/// <summary>
/// Message内容
/// </summary>
public string Message
{
get { return _message; }
set { _message = value; }
}
private DateTime _publishTime;
/// <summary>
/// Message发布时间
/// </summary>
public DateTime PublishTime
{
get { return _publishTime; }
set { _publishTime = value; }
}
}
}
SqlMessage
using System;
using System.Collections.Generic;
using System.Text;
namespace Pattern.Interpreter
{
/// <summary>
/// Sql方式操作Message
/// </summary>
public class SqlMessage
{
/// <summary>
/// 获取Message
/// </summary>
/// <returns></returns>
public static List<MessageModel> Get()
{
List<MessageModel> l = new List<MessageModel>();
l.Add(new MessageModel("SQL方式获取Message", DateTime.Now));
return l;
}
}
}
using System.Collections.Generic;
using System.Text;
namespace Pattern.Interpreter
{
/// <summary>
/// Sql方式操作Message
/// </summary>
public class SqlMessage
{
/// <summary>
/// 获取Message
/// </summary>
/// <returns></returns>
public static List<MessageModel> Get()
{
List<MessageModel> l = new List<MessageModel>();
l.Add(new MessageModel("SQL方式获取Message", DateTime.Now));
return l;
}
}
}
Context
using System;
using System.Collections.Generic;
using System.Text;
namespace Pattern.Interpreter
{
/// <summary>
/// Context
/// </summary>
public class Context
{
private string _input;
private string _output;
/// <summary>
/// 构造函数
/// </summary>
/// <param name="input">输入内容</param>
public Context(string input)
{
this._input = input;
}
/// <summary>
/// 输入内容
/// </summary>
public string Input
{
get { return _input; }
set { _input = value; }
}
/// <summary>
/// 输出内容
/// </summary>
public string Output
{
get { return _output; }
set { _output = value; }
}
}
}
using System.Collections.Generic;
using System.Text;
namespace Pattern.Interpreter
{
/// <summary>
/// Context
/// </summary>
public class Context
{
private string _input;
private string _output;
/// <summary>
/// 构造函数
/// </summary>
/// <param name="input">输入内容</param>
public Context(string input)
{
this._input = input;
}
/// <summary>
/// 输入内容
/// </summary>
public string Input
{
get { return _input; }
set { _input = value; }
}
/// <summary>
/// 输出内容
/// </summary>
public string Output
{
get { return _output; }
set { _output = value; }
}
}
}
AbstractExpression
using System;
using System.Collections.Generic;
using System.Text;
namespace Pattern.Interpreter
{
/// <summary>
/// 抽象公式(AbstractExpression)
/// </summary>
public abstract class AbstractExpression
{
/// <summary>
/// 解释Context的方法
/// </summary>
/// <param name="context">context</param>
public void Interpret(Context context)
{
if (String.IsNullOrEmpty(context.Input))
{
return;
}
context.Output += GetCSharp(context.Input);
}
/// <summary>
/// 获得输入内容所对应的C#代码
/// </summary>
/// <param name="source">source</param>
/// <returns></returns>
private string GetCSharp(string source)
{
string csharp = "";
string word = "";
// 从输入内容中取得要解释的词
word = GetWord(source);
// 从字典中找到word所对应的C#代码
GetDictionary().TryGetValue(word, out csharp);
return csharp;
}
/// <summary>
/// 从输入内容中取得要解释的词
/// </summary>
/// <param name="source">source</param>
/// <returns></returns>
public abstract string GetWord(string source);
/// <summary>
/// 获取字典
using System.Collections.Generic;
using System.Text;
namespace Pattern.Interpreter
{
/// <summary>
/// 抽象公式(AbstractExpression)
/// </summary>
public abstract class AbstractExpression
{
/// <summary>
/// 解释Context的方法
/// </summary>
/// <param name="context">context</param>
public void Interpret(Context context)
{
if (String.IsNullOrEmpty(context.Input))
{
return;
}
context.Output += GetCSharp(context.Input);
}
/// <summary>
/// 获得输入内容所对应的C#代码
/// </summary>
/// <param name="source">source</param>
/// <returns></returns>
private string GetCSharp(string source)
{
string csharp = "";
string word = "";
// 从输入内容中取得要解释的词
word = GetWord(source);
// 从字典中找到word所对应的C#代码
GetDictionary().TryGetValue(word, out csharp);
return csharp;
}
/// <summary>
/// 从输入内容中取得要解释的词
/// </summary>
/// <param name="source">source</param>
/// <returns></returns>
public abstract string GetWord(string source);
/// <summary>
/// 获取字典