责任链模式【CHAIN OF RESPONSIBILITY PATTERN 】

responsibility.h

/*
 * responsibility.h
 *
 *  Created on: Sep 29, 2012
 *      Author: hl
 */

#ifndef _RESPONSIBILITY_H_
#define _RESPONSIBILITY_H_
#include <string>
using namespace std;

class IWomen
{
public:
    virtual int getType() = 0;
    virtual string getRequest() = 0;
};

class Women : public IWomen
{
public:
    Women(int type, string req);
public:
    int getType();
    string getRequest();
private:
    int _type;
    string _req;
};

/**
 * @责任链处理 - 实现最好都放到.cpp中，不给别人看见！这里我方便学习...
 */
class Handle
{
public:
    Handle(int level)
    {
        this->_level = level;
    }
    ~Handle()
    {
        if (_pHandle)
            delete _pHandle;
    }
public:
    void HandleMessage(IWomen * pIWomen)
    {
        if (this->_level == pIWomen->getType())
            this->response(pIWomen);
        else
        {
            if (this->_pHandle != NULL)
                this->_pHandle->HandleMessage(pIWomen);
        }
    }
public:
    void setNext(Handle * pHandle)
    {
        this->_pHandle = pHandle;
    }
public:
    virtual void response(IWomen * pIWomen) = 0;
private:
    int _level;
    Handle * _pHandle;
};

/**
 * 父亲响应女儿(Women)的请求
 */
class Father : public Handle
{
public:
    Father() : Handle(1)    /// < 基类初始化变量，解决基类和子类的构造函数参数不同问题
    {

    }
    void response(IWomen * pIWomen);
};

/**
 * 父亲响应女儿(Women)的请求
 */
class Son : public Handle
{
public:
    Son() : Handle(2)    /// < 基类初始化变量，解决基类和子类的构造函数参数不同问题
    {

    }
    void response(IWomen * pIWomen);
};

#endif /* _RESPONSIBILITY_H_ */

responsibility.cpp

//============================================================================
// Name        : responsibility.cpp
// Author      : hl
// Version     :
// Copyright   : Copyright (c) 2012 Tiros
// Description : Responsibility Patternin C++, Ansi-style
//============================================================================

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

Women::Women(int type, string req)
{
    this->_type = type;
    switch (this->_type)
    {
    case 1:
        this->_req = "女儿的请求: " + req;
        break;
    case 2:
        this->_req = "母亲的要求: " + req;
        break;
    case 3:
        break;
    default:
        break;
    }
}

int Women::getType()
{
    return this->_type;
}


string Women::getRequest()
{
    return this->_req;
}


void Father::response(IWomen * pIWomen)
{
    cout << "女儿向父亲请求！" << endl;
    cout << pIWomen->getRequest() << endl;
    cout << "同意" << endl;
}

void Son::response(IWomen * pIWomen)
{
    cout << "母亲向儿子要求！" << endl;
    cout << pIWomen->getRequest() << endl;
    cout << "同意" << endl;
}


int main()
{
    IWomen * wom1 = new Women(1, "父亲大人，我要出去happy");
    IWomen * wom2 = new Women(2, "儿子，我们去吃肯德基");

    Father fath;
    Son son;
    fath.setNext(&son);

    fath.HandleMessage(wom1);
    fath.HandleMessage(wom2);

    return 0;
}