状态模式

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/* Author: ting
 * Mail: vlicecream520@gmail.com 
 * Detail: (
 *   1. 状态模式示例
 *            一个程序员会随着一天的不同时间处于不同状态
 *
 *   2. 状态模式适用于 根据自己的状态发生变化 行为也随之发现变化
 *            他跟观察者模式不一样 观察者模式是 一个或多个对象 根据 一个对象的状态发生变化而发生变化
 * )
 * */

#include <iostream>
using namespace std;

class Work;

// 状态接口
class State {
    public:
        // 与 work 行为相关的函数
        virtual void WriteProgram(Work *w) = 0;
};
// 工作类
class Work {
private:
    // 当前状态
    State* current;
    // 当前时间
    double hour;
    // 工作是否完成
    bool taskFinish;
 
public:
    Work() { taskFinish = false; }
    // 设置/获取时间
    void SetTime(double hour) { this->hour = hour; }
    double GetTime() { return this->hour; }
    // 设置状态
    void SetState(State *s) { current = s; }
    // 设置工程是否完成
    void SetFinish() { this->taskFinish = true; }
    // 获取工作是否完成状态
    bool GetFinish() { return taskFinish; }
    // work 行为
    void WriteProgram() { current->WriteProgram(this); }
};

//下班休息状态
class RestState : public State {
public:
    void WriteProgram(Work *w) { cout << "当前时间:" << w->GetTime() << "点 工作完成，下班回家了" << endl; }
};

//睡眠工作状态
class SleepingState : public State {
public:
    void WriteProgram(Work *w) { cout << "受不了了," << w->GetTime() << "点了，先睡吧" << endl; }
};

//晚上工作状态
class EveningState : public State {
public:
    void WriteProgram(Work *w) {
        //任务完成了，可以休息了
        if(w->GetFinish()) {
            w->SetState(new RestState());
            w->WriteProgram();
        }
                else {
            if(w->GetTime()<21) { cout << "当前时间:" << w->GetTime() << "点 加班了，疲惫至极" << endl; }
                        else {
                //找过21点
                w->SetState(new SleepingState());
                w->WriteProgram();
                        }
        }
    }
};

//下午工作状态
class AfternoonState : public State {
public:
    void WriteProgram(Work *w) {
        if(w->GetTime()<17) { cout << "当前时间:" << w->GetTime() << "点 状态还不错，继续努力" << endl; }
                else {
            w->SetState(new EveningState());
            w->WriteProgram();
        }
    }
};

//中午工作状态
class NoonState : public State {
public:
    void WriteProgram(Work *w)
    {
        if (w->GetTime()<13)
            cout<<"当前时间:"<<w->GetTime()<<"点 饿了，午饭:犯困，午休"<<endl;
        else
        {
            w->SetState(new AfternoonState());
            w->WriteProgram();
        }
    }
};

//上午工作状态
class ForenoonState : public State {
public:
    void WriteProgram(Work *w)
    {
        if(w->GetTime()<12)
            cout<<"当前时间:"<<w->GetTime()<<"点 上午工作，精神百倍"<<endl;
        else
        {
            w->SetState(new NoonState());
            w->WriteProgram();
        }
    }
};

void main()
{
    //紧急项目
    Work *emergencyProjects = new Work();
    emergencyProjects->SetState(new ForenoonState());
    emergencyProjects->SetTime(9); 
    emergencyProjects->WriteProgram();
    emergencyProjects->SetTime(10);
	emergencyProjects->WriteProgram();
 
    emergencyProjects->SetTime(12);
    emergencyProjects->WriteProgram();
    emergencyProjects->SetTime(14);
	emergencyProjects->WriteProgram();
 
    //完成工作，不需要再加班了
    //emergencyProjects->SetFinish();
    emergencyProjects->SetTime(19);
    emergencyProjects->WriteProgram();

    emergencyProjects->SetTime(22);
    emergencyProjects->WriteProgram();
}