原型模式

前序

这回小菜准备去应聘了,大鸟看了小菜的简历后感觉他都是在瞎扯.小菜准备了很多份相同的简历.于是大鸟便让小菜同学通过编写代码来实现相同的三份简历.

不久后小菜实现了第一版的代码.

小菜的第一版代码

#include <stdio.h>

 

class Resume

{

public:

       Resume(char* _name) : name(_name),sex(0),age(0),timeArea(0),company(0){}

      

       void SetPersonalInfo(char* _sex,char* _age)

       {

              sex = _sex;

              age = _age;

       }

      

       void SetWorkExperience(char* _timeArea,char* _company)

       {

              timeArea = _timeArea;

              company = _company;

       }

      

       void Display()

       {

              printf("%s %s %s\n",name,sex,age);

              printf("工作经历:%s %s",timeArea,company);

       }

protected:

       char* name;

       char* sex;

       char* age;

       char* timeArea;

       char* company;

};

 

int main()

{

       Resume a("大鸟");

       a.SetPersonalInfo("男","29");

       a.SetWorkExperience("1998-2000","XX公司");

      

       Resume b("大鸟");

       b.SetPersonalInfo("男","29");

       b.SetWorkExperience("1998-2000","XX公司");

      

       Resume c("大鸟");

       c.SetPersonalInfo("男","29");

       c.SetWorkExperience("1998-2000","XX公司");

      

       a.Display();

       b.Display();

       c.Display();

      

       return 0;

}

大鸟看后说到:”三份简历需要三次初始化,这样客户端的代码很麻烦,如果要二十份那就要二十次初始化.”

小菜答到:”是的.如果写错了一个字那就要改二十次.”

于是大鸟便叫小菜用原型模式重写了一遍代码.

原型模式

通过给出一个原型对象来指明所要创建的对象的类型，然后用复制这个原型对象的方法创建出更多同类型的对象。原始模型模式允许动态的增加或减少产品类，产品类不需要非得有任何事先确定的等级结构，原始模型模式适用于任何的等级结构。缺点是每一个类都必须配备一个克隆方法。

实现方式(UML类图)

实现代码

#include <stdio.h>

 

class ICloneable

{

public:

       virtual ICloneable* Clone()=0;

};

 

// 工作经历

class WorkExperience : public ICloneable

{

public:

       char*& WorkDate()

       {

              return workDate;

       }

      

       char*& Company()

       {

              return company;

       }

      

       virtual WorkExperience* Clone()

       {

              WorkExperience* Result = new WorkExperience();

              Result->WorkDate() = workDate;

              Result->Company() = company;

              return Result;

       }

protected:

       char* workDate;

       char* company;

};

 

// 简历

class Resume : public ICloneable

{

public:

       Resume(char* _name) : name(_name),work(new WorkExperience()){}

      

       ~Resume()

       {

              delete work;

       }

      

       void SetPersonalInfo(char* _sex,char* _age)

       {

              sex = _sex;

              age = _age;

       }

      

       void SetWorkExperience(char* _workDate,char* _company)

       {

              work->WorkDate() = _workDate;

              work->Company() = _company;

       }

      

       void Display()

       {

              printf("%s %s %s\n",name,sex,age);

              printf("工作经历:%s %s\n",work->WorkDate(),work->Company());

       }

      

       virtual Resume* Clone()

       {

              Resume* Result = new Resume(work);

              Result->name = name;

              Result->sex = sex;

              Result->age = age;

              return Result;

       }

protected:

       Resume(WorkExperience* _work)

       {

              work = _work->Clone();

       }

      

       char* name;

       char* sex;

       char* age;

       WorkExperience* work;

};

 

int main()

{

       Resume* a = new Resume("大鸟");

       a->SetPersonalInfo("男","29");

       a->SetWorkExperience("1998-2000","XX公司");

      

       Resume* b = a->Clone();

       b->SetWorkExperience("1998-2006","YY企业");

      

       Resume* c = a->Clone();

       c->SetPersonalInfo("男","24");

       c->SetWorkExperience("1998-2003","ZZ企业");

      

       a->Display();

       b->Display();

       c->Display();

      

       delete a;

       delete b;

       delete c;

       return 0;

}

运行结果

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