大话设计模式之组合模式

转载地址：
http://www.cnblogs.com/xyz168/archive/2011/06/26/2090512.html
本文主要分为三部分：1、组合模式的基本定义；2、组合模式的类图结构；3、代码示例

一、定义

Composite：将对象组合成树形结构以表示“部分-整体”的层次结构。Composite使得客户对单个对象和复合对象的使用具有一致性。

二、类图结构



三、代码示例

例子：一个项目包含多个文件夹、类、接口等，而一个文件夹也同样可以包含多个文件夹、类、接口。

代码：

项目抽象类：

usingSystem;

usingSystem.Collections.Generic;

usingSystem.Linq;

usingSystem.Text;

namespacey.CompositePattern

{

publicabstractclass ComponentProject

{

protectedstringname = string.Empty;

publicComponentProject(stringname)

{

this.name = name;

}

publicabstractvoid Add(ComponentProject componentProject);

publicabstractvoid Remove(ComponentProject componentProject);

publicabstractvoid ShowTitle(intdepth);

}

}

文件夹实现类：

usingSystem;

usingSystem.Collections.Generic;

usingSystem.Linq;

usingSystem.Text;

namespacey.CompositePattern

{

publicclassCompositeFolder:ComponentProject

{

privateList<ComponentProject> subFolder = newList<ComponentProject>();

publicCompositeFolder(stringname)

:base(name)

{ }

publicoverridevoid Add(ComponentProject componentProject)

{

subFolder.Add(componentProject);

}

publicoverridevoid Remove(ComponentProject componentProject)

{

subFolder.Remove(componentProject);

}

publicoverridevoid ShowTitle(intdepth)

{

Console.WriteLine(newstring('-',depth)+name);

foreach(ComponentProject project insubFolder)

{

project.ShowTitle(depth+2);

}

}

}

}

”类“实现类：

usingSystem;

usingSystem.Collections.Generic;

usingSystem.Linq;

usingSystem.Text;

namespacey.CompositePattern

{

publicclassLeafClass:ComponentProject

{

publicLeafClass(stringname)

:base(name)

{ }

publicoverridevoid Add(ComponentProject componentProject)

{

}

publicoverridevoid Remove(ComponentProject componentProject)

{

}

publicoverridevoid ShowTitle(intdepth)

{

Console.WriteLine(newstring('-', depth) + name);

}

}

}

“接口”实现类：

usingSystem;

usingSystem.Collections.Generic;

usingSystem.Linq;

usingSystem.Text;

namespacey.CompositePattern

{

publicclassLeafInterface:ComponentProject

{

publicLeafInterface(stringname)

:base(name)

{ }

publicoverridevoid Add(ComponentProject componentProject)

{

}

publicoverridevoid Remove(ComponentProject componentProject)

{

}

publicoverridevoid ShowTitle(intdepth)

{

Console.WriteLine(newstring('-', depth) + name);

}

}

}

主程序：

usingSystem;

usingSystem.Collections.Generic;

usingSystem.Linq;

usingSystem.Text;

namespacey.CompositePattern

{

classProgram

{

staticvoidMain(string[] args)

{

Console.Title="组合模式";

Console.WriteLine("Press any ket to exit program.\r\n");

CompositeFolder mainFolder = newCompositeFolder("Composite Example");

mainFolder.Add(newLeafClass("Main Class"));

mainFolder.Add(newLeafInterface("Main Interface"));

CompositeFolder bussinessFolder = newCompositeFolder("Bussiness Folder");

bussinessFolder.Add(newLeafInterface("Bussiness Interface"));

bussinessFolder.Add(newLeafClass("Bussiness Class"));

mainFolder.Add(bussinessFolder);

CompositeFolder databaseFolder = newCompositeFolder("Database Folder");

databaseFolder.Add(newLeafInterface("Database Interface"));

databaseFolder.Add(newLeafClass("Database Class"));

mainFolder.Add(databaseFolder);

Console.WriteLine("Composite Struct:");

mainFolder.ShowTitle(1);

Console.ReadKey();

}

}

}

参考文献：

《大话设计模式》