中介者模式

#include <iostream>

using namespace std;

class Mediator;

class Colleague {
protected:
    Mediator *mediator;

public:
    Colleague(Mediator *mediator) {
        this->mediator = mediator;
    }
};

class Mediator {
public:
    virtual void Send(string message, Colleague *colleague) = 0;
};

class ConcreteColleague1 : public Colleague {
public:
    ConcreteColleague1(Mediator *mediator):Colleague(mediator) {}
    void Send(string message) {
        message += " (Colleague1)";
        mediator->Send(message,this);
    }
    void Notify(string message) {
        cout << "Colleague1 get message: " << message << endl;
    }
};

class ConcreteColleague2 : public Colleague {
public:
    ConcreteColleague2(Mediator *mediator):Colleague(mediator) {}
    void Send(string message) {
        message += " (Colleague2)";
        mediator->Send(message,this);
    }
    void Notify(string message) {
        cout << "Colleague2 get message: " << message << endl;;
    }
};

class ConcreteColleague3 : public Colleague {
public:
    ConcreteColleague3(Mediator *mediator):Colleague(mediator) {}
    void Send(string message) {
        message += " (Colleague3)";
        mediator->Send(message,this);
    }
    void Notify(string message) {
        cout << "Colleague3 get message: " << message << endl;;
    }
};

class ConcreteMeditor : public Mediator {
public:
    ConcreteMeditor() {}
    void set(ConcreteColleague1 *colleague1,
        ConcreteColleague2 *colleague2,
        ConcreteColleague3 *colleague3) {
        this->colleague1 = colleague1;
        this->colleague2 = colleague2;
        this->colleague3 = colleague3;
    }
    void Send(string message, Colleague *colleague) {
        if(colleague == colleague1)
        {
            colleague2->Notify(message);
            colleague3->Notify(message);
        } else if (colleague == colleague2) {
            colleague1->Notify(message);
            colleague3->Notify(message);
        }
        else if (colleague == colleague3) {
            colleague1->Notify(message);
            colleague2->Notify(message);
        }
    }
private:
    ConcreteColleague1 *colleague1;
    ConcreteColleague2 *colleague2;
    ConcreteColleague3 *colleague3;
};


int main(int argc, char **argv)
{
    ConcreteMeditor *m = new ConcreteMeditor();
    ConcreteColleague1 *c1 = new ConcreteColleague1(m);
    ConcreteColleague2 *c2 = new ConcreteColleague2(m);
    ConcreteColleague3 *c3 = new ConcreteColleague3(m);
    m->set(c1, c2, c3);

    c1->Send("Do you have lunch?");
    c2->Send("No.");
    c3->Send("Yes, I do.");
}