设计模式 Design Parttern ——建造者模式 Builder

#ifndef _BULDER_H_VANEY_
#define _BULDER_H_VANEY_

#include <iostream>
using namespace std;
/******************************************************************
名称  ：builder.h
版本  ：1.00
描述  ：演示建造者模式的概念
作者  ：vaney.li@gmail.com http://blog.csdn.net/leeidea 日期  ：2010年10月13日
版权  ：vaney.li@gmail.com http://blog.csdn.net/leeidea ******************************************************************/

/*
官方解释：The Builder pattern separates the construction of a complex object from its
representation, so the same construction process can create different
representations.

我的理解：抽象工厂是返回一些方法的集合(C++中即返回一个具体类的函数指针)，创建者模式是
返回创建好的东西。

我的应用：目前项目中好像无此用法。是否可以找出一些模块的相同点，然后将这些相同的过程做
作为一个Builder的过程。

*/

//建造者基类
class CBuilder
{
public:
CBuilder()
{
cout << "CBuilder()" << endl;
}
virtual ~CBuilder()
{
cout << "~CBuilder()" << endl;
}

public:

virtual int BuilderPartA(void) = 0;
virtual int BuilderPartB(void) = 0;
};
//建造者具体类
class CBuilderCar : public CBuilder
{
public:
CBuilderCar()
{
cout << "CBuilderCar()" << endl;
}
virtual ~CBuilderCar()
{
cout << "~CBuilderCar()" << endl;
}

public:
virtual int BuilderPartA(void)
{
cout << "CBuilderCar BuilderPartA" << endl;
return 1;
}

virtual int BuilderPartB(void)
{
cout << "CBuilderCar BuilderPartB" << endl;
return 1;
}
};

//建造者具体类
class CBuilderBus : public CBuilder
{
public:
CBuilderBus()
{
cout << "CBuilderBus()" << endl;
}
virtual ~CBuilderBus()
{
cout << "~CBuilderBus()" << endl;
}

public:
virtual int BuilderPartA(void)
{
cout << "CBuilderBus BuilderPartA" << endl;
return 1;
}

virtual int BuilderPartB(void)
{
cout << "CBuilderBus BuilderPartB" << endl;
return 1;
}
};

//建造者使用者
class CDirector
{
CBuilder* _builder;
public:
CDirector(CBuilder* builder)
{
_builder = builder;
cout << "CDirector()" << endl;
}
virtual ~CDirector()
{
if(!_builder)
delete _builder;
_builder = NULL;
cout << "~CDirector()" << endl;
}

public:
int Build(void)
{
if(_builder)
{
//创建各个部分
_builder->BuilderPartA();
_builder->BuilderPartB();

return 1;
}
return 0;
}
};

#define  VANEY_API
//用户
extern "C" VANEY_API int UsingBD();
#endif

#include "Builder.h"

VANEY_API int UsingBD()
{
//创建Car
CBuilderCar* car = new CBuilderCar();
CDirector* director_car = new CDirector(car);
director_car->Build();

//创建Bus
CBuilderBus* bus = new CBuilderBus();
CDirector* director_bus = new CDirector(bus);
director_bus->Build();
return 1;

}

#include "Builder.h"

VANEY_API int UsingBD()
{
//创建Car
CBuilderCar* car = new CBuilderCar();
CDirector* director_car = new CDirector(car);
director_car->Build();

//创建Bus
CBuilderBus* bus = new CBuilderBus();
CDirector* director_bus = new CDirector(bus);
director_bus->Build();
return 1;

}