抽象工厂模式（C++实现）

（本博客旨在个人总结回顾）

1、详情：

抽象工厂模式：提供一个创建一系列相关或相互依赖对象的接口，而无需指定它们具体的类。

角色：

抽象工厂角色：这是抽象工厂模式的核心，它与应用程序无关。是具体工厂角色必须实现或继承的的父类。

具体工厂角色：包含具体业务逻辑有关的代码。由应用程序调用来创建对应的具体产品对象。它由具体的类来实现。

抽象产品角色：具体产品实现或继承的父类。

具体产品角色：具体工厂角色所创建的对象为此角色的实例。

优点：①便于交换产品系列；②让具体的创建实例过程与客户端分离。

缺点：新增产品族比较复杂，需要改变抽象工厂类，添加增产品类的对应具体工厂类，抽象产品类，具体产品类。

目的：客户端提供一个统一接口，可以创建多个复杂产品族中的产品对象。

2、UML类图：

 

3、代码实现：

Mouse.h(抽象产品类1)

#pragma once
class Mouse
{
public:
    Mouse();
    virtual ~Mouse();

public:
    virtual void showProperty1() = 0;
};

Mouse.cpp

#include "stdafx.h"
#include "Mouse.h"

Mouse::Mouse()
{
}

Mouse::~Mouse()
{
}

DellMouse.h(具体产品1)

#pragma once
#include "Mouse.h"
class DellMouse :
    public Mouse
{
public:
    DellMouse();
    ~DellMouse();

public:
    void showProperty1();
};

DellMouse.cpp

#include "stdafx.h"
#include "DellMouse.h"

DellMouse::DellMouse()
{
}

DellMouse::~DellMouse()
{
}

void DellMouse::showProperty1()
{
    cout << "This is the Dell Mouse" << endl;
}

HPMouse.h(具体产品2)

#pragma once
#include "Mouse.h"
class HPMouse :
    public Mouse
{
public:
    HPMouse();
    ~HPMouse();

public:
    void showProperty1();
};

HPMouse.cpp

#include "stdafx.h"
#include "HPMouse.h"

HPMouse::HPMouse()
{
}

HPMouse::~HPMouse()
{
}

void HPMouse::showProperty1()
{
    cout << "This is HP Mouse!" << endl;
}

Keyboard.h(抽象产品2)

#pragma once
class Keyboard
{
public:
    Keyboard();
    virtual ~Keyboard();
public:
    virtual void showProperty2()=0;
};

Keyboard.cpp

#include "stdafx.h"
#include "Keyboard.h"

Keyboard::Keyboard()
{
}

Keyboard::~Keyboard()
{
}

DellKeyboard.h(具体产品1)

#pragma once
#include "Keyboard.h"
class DellKeyboard :
    public Keyboard
{
public:
    DellKeyboard();
    ~DellKeyboard();

public:
    void showProperty2();
};

DellKeyboard.cpp

#include "stdafx.h"
#include "DellKeyboard.h"

DellKeyboard::DellKeyboard()
{
}

DellKeyboard::~DellKeyboard()
{
}

void DellKeyboard::showProperty2()
{
    cout << "This is Dell Keyboard!" << endl;
}

HPKeyboard.h(具体产品2)

#pragma once
#include "Keyboard.h"
class HPKeyboard :
    public Keyboard
{
public:
    HPKeyboard();
    ~HPKeyboard();

public:
    void showProperty2();
};

HPKeyboard.cpp

#include "stdafx.h"
#include "HPKeyboard.h"

HPKeyboard::HPKeyboard()
{
}

HPKeyboard::~HPKeyboard()
{
}

void HPKeyboard::showProperty2()
{
    cout << "This is HP Keyboard!" << endl;
}

AbstractFactory.h(抽象工厂类)

#pragma once
#include "Mouse.h"
#include "Keyboard.h"

class AbstractFactory
{
public:
    AbstractFactory();
    ~AbstractFactory();

public:
    virtual Mouse* getMouse(ProductType eProductType) = 0;
    virtual Keyboard* getKeyboard(ProductType eProductType) = 0;
};

AbstractFactory.cpp

#include "stdafx.h"
#include "AbstractFactory.h"

AbstractFactory::AbstractFactory()
{
}

AbstractFactory::~AbstractFactory()
{
}

MouseFactory.h(具体工厂类1)

#pragma once
#include "AbstractFactory.h"
class MouseFactory :
    public AbstractFactory
{
public:
    MouseFactory();
    virtual ~MouseFactory();

public:
    Mouse* getMouse(ProductType eProductType);
    Keyboard* getKeyboard(ProductType eProductType);
};

MouseFactory.cpp

#include "stdafx.h"
#include "MouseFactory.h"
#include "DellMouse.h"
#include "HPMouse.h"

MouseFactory::MouseFactory()
{
}

MouseFactory::~MouseFactory()
{
}

Mouse* MouseFactory::getMouse(ProductType eProductType)
{
    switch (eProductType)
    {
    case PT_DELL:
        return new DellMouse();
        break;
    case PT_HP:
        return new HPMouse();
        break;
    default:
        return NULL;
        break;
    }
}

Keyboard* MouseFactory::getKeyboard(ProductType eProductType)
{
    return NULL;
}

KeyboardFactory.h(具体工厂类2)

#pragma once
#include "AbstractFactory.h"

class KeyboardFactory :
    public AbstractFactory
{
public:
    KeyboardFactory();
    ~KeyboardFactory();

public:
    Mouse* getMouse(ProductType eProductType);
    Keyboard* getKeyboard(ProductType eProductType);
};

KeyboardFactory.cpp

#include "stdafx.h"
#include "KeyboardFactory.h"
#include "DellKeyboard.h"
#include "HPKeyboard.h"

KeyboardFactory::KeyboardFactory()
{
}

KeyboardFactory::~KeyboardFactory()
{
}

Mouse* KeyboardFactory::getMouse(ProductType eProductType)
{
    return NULL;
}

Keyboard* KeyboardFactory::getKeyboard(ProductType eProductType)
{
    switch (eProductType)
    {
    case PT_DELL:
        return new DellKeyboard();
        break;
    case PT_HP:
        return new HPKeyboard();
        break;
    default:
        break;
        return NULL;
    }
}

stdafx.h(预编译头)

// stdafx.h : 标准系统包含文件的包含文件，
// 或是经常使用但不常更改的
// 特定于项目的包含文件
//

#pragma once

#include "targetver.h"

#include <stdio.h>
#include <tchar.h>

#include <iostream>
using namespace std;
enum ProductType{ PT_DELL, PT_HP };

// TODO:  在此处引用程序需要的其他头文件

调用代码：

// AbstractFactoryPatternMemo.cpp : 定义控制台应用程序的入口点。
//

#include "stdafx.h"
#include "AbstractFactory.h"
#include "MouseFactory.h"
#include "KeyboardFactory.h"
#include "Mouse.h"
#include "Keyboard.h"
#include "FactoryProducer.h"


int _tmain(int argc, _TCHAR* argv[])
{
    AbstractFactory* pAbstractFactory = new MouseFactory();
    Mouse* pMouse = pAbstractFactory->getMouse(PT_DELL);
    pMouse->showProperty1();

    pMouse = pAbstractFactory->getMouse(PT_HP);
    pMouse->showProperty1();

    pAbstractFactory = new KeyboardFactory();
    Keyboard* pKeyboard = pAbstractFactory->getKeyboard(PT_DELL);
    pKeyboard->showProperty2();

    pKeyboard = pAbstractFactory->getKeyboard(PT_HP);
    pKeyboard->showProperty2();

    system("pause");
	return 0;
}

输出结果：