builder模式

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#sqlserver #class #delete #sql #access #server

c++ patterns 2010-11-26 专栏收录该内容

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本文通过一个具体的实例展示了建造者模式在软件开发中的应用。通过将摩托车的不同部件（如车轮和油箱）抽象为不同的类，实现了产品的组装过程与部件的具体实现分离，从而达到解耦的目的。

对所有组件统一封装，并按一定的顺序组装使用

#include <cstdlib>
#include <iostream>

using namespace std;
class Sql
{
public:
virtual ~Sql(){cout<<"Sql 基类析构"<<endl;}
virtual void Do() = 0;
};
class SqlAccess:public Sql
{
public:
virtual ~SqlAccess(){cout<<"SqlAccess 析构"<<endl;}
virtual void Do(){cout<<"Access 牌车轮"<<endl;}
};
class SqlServer:public Sql
{
public:
virtual ~SqlServer(){cout<<"SqlServer 析构"<<endl;}
virtual void Do(){cout<<"SqlServer 牌车轮"<<endl;}
};
class Department
{
public:
virtual ~Department(){cout<<"Department 基类析构"<<endl;}
virtual void Did() = 0;
};
class DepartmentAccess:public Department
{
public:
virtual ~DepartmentAccess(){cout<<"DepartmentAccess 析构"<<endl;}
virtual void Did(){cout<<"DepartmentAccess 牌油箱"<<endl;};
};
class DepartmentServer:public Department
{
public:
virtual ~DepartmentServer(){cout<<"DepartmentServer 析构"<<endl;}
virtual void Did(){cout<<"DepartmentServer 牌油箱"<<endl;};
};
class Builder
{
public:
virtual ~Builder(){cout<<"Builder 基类析构"<<endl;}
virtual Sql* BuilderSql() = 0;
virtual Department* BuilderDepartment() = 0;
};
class BuilderAccess:public Builder
{
public:
virtual ~BuilderAccess(){cout<<"BuilderAccess 析构"<<endl;}
virtual Sql* BuilderSql(){return new SqlAccess;}
virtual Department* BuilderDepartment(){return new DepartmentAccess;}
};
class BuilderServer:public Builder
{
public:
virtual ~BuilderServer(){cout<<"BuilderServer 析构"<<endl;}
virtual Sql* BuilderSql(){return new SqlServer;}
virtual Department* BuilderDepartment(){return new DepartmentServer;}
};
class Director
{
Builder* pBui;
Sql* pSql;
Department* pDep;
public:
Director(Builder* p){pBui = p;}
~Director()
{
    delete pBui;
    delete pSql;
    delete pDep;
}
void Construct()
{
    pSql = pBui->BuilderSql();
    pDep = pBui->BuilderDepartment();
}
void Process()
{
    pSql->Do();
    pDep->Did();
}
};
//生产摩托车的步骤是一样的
void Product(Director* pDir)
{
pDir->Construct();
pDir->Process();
}
int main(int argc, char *argv[])
{
    //造一辆ACCESS牌的摩托车
    cout<<"---------------------造一辆ACCESS牌的摩托车"<<endl;
    Director* pDir = new Director(new BuilderAccess);
    Product(pDir);
    cout<<"---------------------清理制造ACCESS摩托车产生的垃圾"<<endl;
    delete pDir;
    //造一辆Server牌的摩托车
    cout<<"---------------------造一辆Server牌的摩托车"<<endl;
    pDir = new Director(new BuilderServer);
    Product(pDir);
    cout<<"---------------------清理制造Server摩托车产生的垃圾"<<endl;
    delete pDir;
    system("PAUSE");
    return EXIT_SUCCESS;
}