一颗不安分的创业心

DOTA版设计模式——命令

命令模式看起来好像简单些,实际还是十分复杂的。
代码比较简单,所有的Command只要继承了ICommand接口即可。
    public interface ICommand
    {
        
object Execute();
    }

具体的Command类见完整代码。Command对象在构造函数中定义操作的对象,Execute方法调用构造函数中定义的对象。本示例缺少了Undo的实现,只要在执行命令时把命令记录下来,执行Undo时进行反操作即可。
UML图:

测试代码:
            DotaPatternLibrary.Command.ControlUI control = new DotaPatternLibrary.Command.ControlUI();
            DotaPatternLibrary.Command.Peasent peasent = new DotaPatternLibrary.Command.Peasent();
            DotaPatternLibrary.Command.ICommand command = new DotaPatternLibrary.Command.BuildAltar(peasent);
            control.AddCommand("ba", command);
            command = new DotaPatternLibrary.Command.BuildBarracks(peasent);
            control.AddCommand("bb", command);
            control.PressButton("ba");
            object o = control.PressButton("bb");
            DotaPatternLibrary.Command.Barracks bbObj = o as DotaPatternLibrary.Command.Barracks;
            command = new DotaPatternLibrary.Command.ProductSoldier(bbObj);
            control.AddCommand("ps", command);
            control.PressButton("ps");
完整代码:
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Collections;

using DotaCommon;

namespace DotaPatternLibrary.Command
{
    
public class ControlUI
    {
        
private Hashtable commands;
        
public ControlUI()
        {
            commands 
= new Hashtable();
        }
        
public void AddCommand(string button, ICommand command)
        {
            commands.Add(button, command);
        }

        
public object PressButton(string button)
        {
            
return ((ICommand)commands[button]).Execute();
        }
    }

    
public interface ICommand
    {
        
object Execute();
    }

    
public class BuildAltar : ICommand
    {
        Peasent peasent;
        
public BuildAltar(Peasent peasent)
        {
            
this.peasent = peasent;
        }

        
#region ICommand 成员

        
public object Execute()
        {
            
return peasent.BuildAltar();
        }

        
#endregion
    }

    
public class UnBuildAltar : ICommand
    {
        Peasent peasent;
        
public UnBuildAltar(Peasent peasent)
        {
            
this.peasent = peasent;
        }

        
#region ICommand 成员

        
public object Execute()
        {
            
return peasent.UnBuildAltar();
        }

        
#endregion
    }

    
public class BuildBarracks : ICommand
    {
        Peasent peasent;
        
public BuildBarracks(Peasent peasent)
        {
            
this.peasent = peasent;
        }

        
#region ICommand 成员

        
public object Execute()
        {
            
return peasent.BuildBarracks();
        }

        
#endregion
    }

    
public class UnBuildBarracks : ICommand
    {

        Peasent peasent;
        
public UnBuildBarracks(Peasent peasent)
        {
            
this.peasent = peasent;
        }

        
#region ICommand 成员

        
public object Execute()
        {
            
return peasent.UnBuildBarracks();
        }

        
#endregion
    }

    
public class ProductSoldier : ICommand
    {
        Barracks barracks;
        
public ProductSoldier(Barracks barracks)
        {
            
this.barracks = barracks;
        }
        
#region ICommand 成员

        
public object Execute()
        {
            
return barracks.ProductSoldier();
        }

        
#endregion
    }

    
public class UnProductSoldier : ICommand
    {
        Barracks barracks;
        
public UnProductSoldier(Barracks barracks)
        {
            
this.barracks = barracks;
        }
        
#region ICommand 成员

        
public object Execute()
        {
            
return barracks.UnProductSoldier();
        }

        
#endregion
    }

    
public class Peasent
    {
        
public Alltar BuildAltar()
        {
            LandpyForm.Form.OutputResult(
"BuildAltar");
            
return new Alltar();
        }

        
public object UnBuildAltar()
        {
            LandpyForm.Form.OutputResult(
"Undo BuildAltar");
            
return null;
        }

        
public object BuildBarracks()
        {
            LandpyForm.Form.OutputResult(
"BuildBarracks");
            
return new Barracks();
        }

        
public object UnBuildBarracks()
        {
            LandpyForm.Form.OutputResult(
"Undo BuildBarracks");
            
return null;
        }
    }

    
public class Alltar
    {
        
public void ProductHero()
        {
            LandpyForm.Form.OutputResult(
"ProductHero");
        }
        
public void UnProductHero()
        {
            LandpyForm.Form.OutputResult(
"Undo ProductHero");
        }
    }

    
public class Barracks
    {
        
public object ProductSoldier()
        {
            LandpyForm.Form.OutputResult(
"ProductSoldier");
            
return new Soldier();
        }
        
public object UnProductSoldier()
        {
            LandpyForm.Form.OutputResult(
"Undo ProductSoldier");
            
return null;
        }
    }

    
public class Soldier
    {
    }
}
posted @ 2009-07-26 23:03  pangxiaoliang[北京]流浪者  阅读(297)  评论(0编辑  收藏  举报
小豆芽之父