设计模式——职责链

基类Employee.h

#ifndef __EMPLOYEE_H__
#define __EMPLOYEE_H__
#include "stdafx.h"
#include 
using namespace std;

class CEmployee
{
public:
	CEmployee();

	void setSuccessor(CEmployee* successor){m_Successor = successor;}
	virtual void handleRequest(string strDishName) = 0;

protected:
	CEmployee* m_Successor;
};
#endif

Employee.cpp

#include "stdafx.h"
#include "employee.h"

CEmployee::CEmployee()
{
	//m_Successor = NULL;
}

assistantCook.cpp

#include "stdafx.h"
#include "assistantCook.h"

void CAssistantCook::handleRequest(string strDishName)
{
	if(strDishName.compare("XiaoCai") == 0)
	{
		printf("assistant cook handle this dish[%s]\n", strDishName.c_str());
	}
	else if(m_Successor)
	{
		m_Successor->handleRequest(strDishName);
	}
	else
	{
		// end of chain
		printf("no one can cook this dish[%s]\n", strDishName.c_str());
	}
}

assistantCook.h

#ifndef __ASSISTANT_COOK_H__
#define __ASSISTANT_COOK_H__

#include "employee.h"

class CAssistantCook: public CEmployee
{
public:

	void CAssistantCook::handleRequest(string strDishName);

private:

};
#endif

ChefCook.h

#ifndef __CHEF_COOK_H__
#define __CHEF_COOK_H__

#include "employee.h"

class CChefCook : public CEmployee
{
public:
	void handleRequest(string strDishName);

private:

};

#endif

ChefCook.cpp

#include "stdafx.h"
#include "ChefCook.h"


void CChefCook::handleRequest(string strDishName)
{
	if(strDishName.compare("DaPanJi") == 0)
	{
		printf("chef cook handle this dish[%s]\n", strDishName.c_str());
	}
	else if(m_Successor)
	{
		m_Successor->handleRequest(strDishName);
	}
	else
	{
		// end of chain
		printf("no one can cook this dish[%s]\n", strDishName.c_str());
	}
}

waiter.h

#ifndef __WAITER_H__
#define __WAITER_H__

#include "employee.h"

class CWaiter : public CEmployee
{
public:
	void handleRequest(string strDishName);

};

#endif

waiter.cpp

#include "stdafx.h"
#include "waiter.h"

void CWaiter::handleRequest(string strDishName)
{
	if(m_Successor)
	{
		m_Successor->handleRequest(strDishName);
	}
	else
	{
		printf("waiter can do nothing but order dish\n");
	}
}

Customer.h

#ifndef __CUSTOMER_H__
#define __CUSTOMER_H__
#include "stdafx.h"
#include 
using namespace std;

class CCustomer
{
public:
	CCustomer(string orderDishName = NULL);

	string getDishName(){return m_dishName;}

private:
	string m_dishName;
};


#endif

Customer.cpp

#include "stdafx.h"
#include "Customer.h"


CCustomer::CCustomer(string orderDishName)
	: m_dishName(orderDishName)
{
}

main.cpp

// CorTest.cpp : 定义控制台应用程序的入口点。
//

#include "stdafx.h"
#include "ChefCook.h"
#include "employee.h"
#include "Customer.h"
#include "waiter.h"
#include "assistantCook.h"

int _tmain(int argc, _TCHAR* argv[])
{
	CEmployee* chefCook = new CChefCook();
	CEmployee* assit = new CAssistantCook();
	CEmployee* waiter = new CWaiter();

	waiter->setSuccessor(assit);
	assit->setSuccessor(chefCook);

	CCustomer* customer1 = new CCustomer("DaPanJi");
	CCustomer* customer2 = new CCustomer("XiaoCai");
	CCustomer* customer3 = new CCustomer("XiongMao");

	waiter->handleRequest(customer1->getDishName());
	waiter->handleRequest(customer2->getDishName());
	waiter->handleRequest(customer3->getDishName());


	system("pause");

	return 0;
}