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乐在其中设计模式(C#) - 抽象工厂模式(Abstract Factory Pattern)

Posted on 2007-05-03 22:08  webabcd  阅读(14592)  评论(32编辑  收藏
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乐在其中设计模式(C#) - 抽象工厂模式(Abstract Factory Pattern)


作者:webabcd


介绍
提供一个创建一系列相关或相互依赖对象的接口,而无需指定它们具体的类。


示例
有Message和MessageModel,Message有一个Insert()方法,该方法的参数是MessageModel。



AbstractMessageModel
using System;
using System.Collections.Generic;
using System.Text;

namespace Pattern.AbstractFactory
{
    
/// <summary>
    
/// 抽象Message实体类(AbstractProduct)
    
/// </summary>

    public abstract class AbstractMessageModel
    
{
        
/// <summary>
        
/// 构造函数
        
/// </summary>

        public AbstractMessageModel()
        
{

        }


        
/// <summary>
        
/// 构造函数
        
/// </summary>
        
/// <param name="msg">Message内容</param>
        
/// <param name="pt">Message发布时间</param>

        public AbstractMessageModel(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; }
        }


        
/// <summary>
        
/// UserId
        
/// </summary>

        public abstract string UserId
        
{
            
get;
            
set;
        }

    }

}


SqlMessageModel
using System;
using System.Collections.Generic;
using System.Text;

namespace Pattern.AbstractFactory
{
    
/// <summary>
    
/// SqlMessage实体类(Product)
    
/// </summary>

    public class SqlMessageModel : AbstractMessageModel
    
{
        
/// <summary>
        
/// 构造函数
        
/// </summary>

        public SqlMessageModel()
            : 
base()
        
{

        }


        
/// <summary>
        
/// 构造函数
        
/// </summary>
        
/// <param name="userId">UserId</param>
        
/// <param name="msg">Message内容</param>
        
/// <param name="pt">Message发布时间</param>

        public SqlMessageModel(string userId, string msg, DateTime pt)
            : 
base(msg, pt)
        
{
            
this._userId = userId;
        }


        
private string _userId;
        
/// <summary>
        
/// Message内容
        
/// </summary>

        public override string UserId
        
{
            
get return _userId; }
            
set { _userId = value; }
        }

    }

}


XmlMessageModel
using System;
using System.Collections.Generic;
using System.Text;

namespace Pattern.AbstractFactory
{
    
/// <summary>
    
/// XmlMessage实体类(Product)
    
/// </summary>

    public class XmlMessageModel : AbstractMessageModel
    
{
        
/// <summary>
        
/// 构造函数
        
/// </summary>

        public XmlMessageModel()
            : 
base()
        
{

        }


        
/// <summary>
        
/// 构造函数
        
/// </summary>
        
/// <param name="userId">UserId</param>
        
/// <param name="msg">Message内容</param>
        
/// <param name="pt">Message发布时间</param>

        public XmlMessageModel(string userId, string msg, DateTime pt)
            : 
base (msg, pt)
        
{
            
this._userId = userId;
        }


        
private string _userId;
        
/// <summary>
        
/// Message内容
        
/// </summary>

        public override string UserId
        
{
            
// 解密算法后的值
            get return _userId; } 

            
// 加密算法后的值
            set { _userId = value; }
        }

    }

}


AbstractMessage
using System;
using System.Collections.Generic;
using System.Text;

namespace Pattern.AbstractFactory
{
    
/// <summary>
    
/// 操作Message抽象类(AbstractProduct)
    
/// </summary>

    public abstract class AbstractMessage
    
{
        
/// <summary>
        
/// 插入Message
        
/// </summary>
        
/// <param name="amm">AbstractMessageModel</param>
        
/// <returns></returns>

        public abstract string Insert(AbstractMessageModel amm);
    }

}


SqlMessage
using System;
using System.Collections.Generic;
using System.Text;

namespace Pattern.AbstractFactory
{
    
/// <summary>
    
/// Sql方式操作Message类(Product)
    
/// </summary>

    public class SqlMessage : AbstractMessage
    
{
        
/// <summary>
        
/// 插入Message
        
/// </summary>
        
/// <param name="amm">AbstractMessageModel</param>
        
/// <returns></returns>

        public override string Insert(AbstractMessageModel amm)
        
{
            
return "Sql方式插入Message。帐号:" + amm.UserId 
                
+ ";内容:" + amm.Message 
                
+ ";时间:" + amm.PublishTime.ToString();
        }

    }

}


XmlMessage
using System;
using System.Collections.Generic;
using System.Text;

namespace Pattern.AbstractFactory
{
    
/// <summary>
    
/// Xml方式操作Message类(Product)
    
/// </summary>

    public class XmlMessage : AbstractMessage
    
{
        
/// <summary>
        
/// 插入Message
        
/// </summary>
        
/// <param name="amm">AbstractMessageModel</param>
        
/// <returns></returns>

        public override string Insert(AbstractMessageModel amm)
        
{
            
return "Xml方式插入Message。帐号:" + amm.UserId
                
+ ";内容:" + amm.Message
                
+ ";时间:" + amm.PublishTime.ToString();
        }

    }

}


AbstractMessageFactory
using System;
using System.Collections.Generic;
using System.Text;

namespace Pattern.AbstractFactory
{
    
/// <summary>
    
/// 抽象Message工厂(AbstractFactory)
    
/// </summary>

    public abstract class AbstractMessageFactory
    
{
        
/// <summary>
        
/// 创建MessageModel对象
        
/// </summary>
        
/// <returns></returns>

        public abstract AbstractMessageModel CreateMessageModel();

        
/// <summary>
        
/// 创建Message对象
        
/// </summary>
        
/// <returns></returns>

        public abstract AbstractMessage CreateMessage();
    }

}

SqlMessageFactory
using System;
using System.Collections.Generic;
using System.Text;

namespace Pattern.AbstractFactory
{
    
/// <summary>
    
/// SqlMessage工厂(ConcreteFactory)
    
/// </summary>

    public class SqlMessageFactory : AbstractMessageFactory
    
{
        
/// <summary>
        
/// 创建SqlMessageModel对象
        
/// </summary>
        
/// <returns></returns>

        public override AbstractMessageModel CreateMessageModel()
        
{
            
return new SqlMessageModel();
        }


        
/// <summary>
        
/// 创建SqlMessage对象
        
/// </summary>
        
/// <returns></returns>

        public override AbstractMessage CreateMessage()
        
{
            
return new SqlMessage();
        }

    }

}


XmlMessageFactory
using System;
using System.Collections.Generic;
using System.Text;

namespace Pattern.AbstractFactory
{
    
/// <summary>
    
/// XmlMessage工厂(ConcreteFactory)
    
/// </summary>

    public class XmlMessageFactory : AbstractMessageFactory
    
{
        
/// <summary>
        
/// 创建XmlMessageModel对象
        
/// </summary>
        
/// <returns></returns>

        public override AbstractMessageModel CreateMessageModel()
        
{
            
return new XmlMessageModel();
        }


        
/// <summary>
        
/// 创建XmlMessage对象
        
/// </summary>
        
/// <returns></returns>

        public override AbstractMessage CreateMessage()
        
{
            
return new XmlMessage();
        }

    }

}


Message
using System;
using System.Collections.Generic;
using System.Text;

namespace Pattern.AbstractFactory
{
    
/// <summary>
    
/// Context类
    
/// </summary>

    public class Message
    
{
        
private AbstractMessage _insertMessage;
        
private AbstractMessageModel _messageModel;

        
/// <summary>
        
/// 构造函数
        
/// </summary>
        
/// <param name="factory">AbstractMessageFactory</param>

        public Message(AbstractMessageFactory factory)
        
{
            DateTime pt 
= DateTime.Now;

            _insertMessage 
= factory.CreateMessage();
            _messageModel 
= factory.CreateMessageModel();

        }


        
/// <summary>
        
/// 插入Message
        
/// </summary>
        
/// <param name="userId">UserId</param>
        
/// <param name="msg">Message内容</param>
        
/// <param name="pt">Message发布时间</param>
        
/// <returns></returns>

        public string Insert(string userId, string msg, DateTime pt)
        
{
            _messageModel.UserId 
= userId;
            _messageModel.Message 
= msg;
            _messageModel.PublishTime 
= pt;

            
return _insertMessage.Insert(_messageModel);
        }

    }

}



client
using System;
using System.Data;
using System.Configuration;
using System.Collections;
using System.Web;
using System.Web.Security;
using System.Web.UI;
using System.Web.UI.WebControls;
using System.Web.UI.WebControls.WebParts;
using System.Web.UI.HtmlControls;

using Pattern.AbstractFactory;

public partial class AbstractFactory : System.Web.UI.Page
{
    
protected void Page_Load(object sender, EventArgs e)
    
{
        AbstractMessageFactory amf 
= new SqlMessageFactory();

        Message m 
= new Message(amf);

        Response.Write(m.Insert(
"admin""Sql方式", DateTime.Now));
        Response.Write(
"<br />");

        amf 
= new XmlMessageFactory();

        m 
= new Message(amf);

        Response.Write(m.Insert(
"user""Xml方式", DateTime.Now));
    }

}


运行结果
Sql方式插入Message。帐号:admin;内容:Sql方式;时间:2007-5-3 22:04:56
Xml方式插入Message。帐号:user;内容:Xml方式;时间:2007-5-3 22:04:56


参考
http://www.dofactory.com/Patterns/PatternAbstract.aspx


OK
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