第12章外观模式

一 概念

• 为子系统中的一组接口提供一个一致的界面，此模式定义了一个高层接口，这个接口使得这一子系统更加容易使用。

二 UML图

三 C++代码实现

#include "pch.h"
#include <iostream>
using namespace std;

//四个子系统的类
class SubSystemOne
{
public:
	void MethodOne()
	{
		cout << "子系统方法一" << endl;
	}
};

class SubSystemTwo
{
public:
	void MethodTwo()
	{
		cout << "子系统方法二" << endl;
	}
};

class SubSystemThree
{
public:
	void MethodThree()
	{
		cout << "子系统方法三" << endl;
	}
};

class SubSystemFour
{
public:
	void MethodFour()
	{
		cout << "子系统方法四" << endl;
	}
};

//外观类
class Facade
{
public:
	Facade()
	{
		one = new SubSystemOne;
		two = new SubSystemTwo;
		three = new SubSystemThree;
		four = new SubSystemFour;
	}
	~Facade()
	{
		delete one;
		delete two;
		delete three;
		delete four;
	}
	void MathodA()
	{
		cout << "方法组A()----" << endl;
		one->MethodOne();
		two->MethodTwo();
		four->MethodFour();
	}
	void MathodB()
	{
		cout << "方法组B()----" << endl;
		two->MethodTwo();
		three->MethodThree();
	}
private:
	SubSystemOne* one;
	SubSystemTwo* two;
	SubSystemThree* three;
	SubSystemFour* four;
};
int main()
{
	Facade* facade = new Facade;
	facade->MathodA();
	facade->MathodB();

	delete facade;
	
	return 0;
}