C++设计模式之中介者模式

#include <iostream>
using namespace std;
 
#define SAFE_DELETE(p) if (p) { delete p; p = NULL; }
 
class Mediator;
 
class Colleague
{
public:
     Colleague(Mediator *pMediator) : m_pMediator(pMediator){}
 
     virtual void Send(wchar_t *message) = 0;
 
protected:
     Mediator *m_pMediator;
};
 
class ConcreteColleague1 : public Colleague
{
public:
     ConcreteColleague1(Mediator *pMediator) : Colleague(pMediator){}
 
     void Send(wchar_t *message);
 
     void Notify(wchar_t *message)
     {
          wcout<<message<<endl;
     }
};
 
class ConcreteColleague2 : public Colleague
{
public:
     ConcreteColleague2(Mediator *pMediator) : Colleague(pMediator){}
 
     void Send(wchar_t *message);
 
     void Notify(wchar_t *message)
     {
          cout<<"ConcreteColleague2 is handling the message."<<endl;
          wcout<<message<<endl;
     }
};
 
class Mediator
{
public:
     virtual void Sent(wchar_t *message, Colleague *pColleague) = 0;
};
 
class ConcreteMediator : public Mediator
{
public:
     // The mediator forward the message
     void Sent(wchar_t *message, Colleague *pColleague)
     {
          ConcreteColleague1 *pConcreteColleague1 = dynamic_cast<ConcreteColleague1 *>(pColleague);
          if (pConcreteColleague1)
          {
               cout<<"The message is from ConcreteColleague1. Now mediator forward it to ConcreteColleague2"<<endl;
               if (m_pColleague2)
               {
                    m_pColleague2->Notify(message);
               }
          }
          else
          {
               if (m_pColleague1)
               {
                    m_pColleague1->Notify(message);
               }
          }
     }
 
     void SetColleague1(Colleague *pColleague)
     {
          m_pColleague1 = dynamic_cast<ConcreteColleague1 *>(pColleague);
     }
 
     void SetColleague2(Colleague *pColleague)
     {
          m_pColleague2 = dynamic_cast<ConcreteColleague2 *>(pColleague);
     }
 
private:
     // The Mediator knows all the Colleague
     ConcreteColleague1 *m_pColleague1;
     ConcreteColleague2 *m_pColleague2;
};
 
void ConcreteColleague1::Send(wchar_t *message)
{
     // The second parameter mark where the message comes from
     m_pMediator->Sent(message, this);
}
 
void ConcreteColleague2::Send(wchar_t *message)
{
     m_pMediator->Sent(message, this);
}
 
int main()
{
     // Create the mediator
     Mediator *pMediator = new ConcreteMediator();
 
     Colleague *pColleague1 = new ConcreteColleague1(pMediator);
     Colleague *pColleague2 = new ConcreteColleague2(pMediator);
 
     ConcreteMediator *pConcreteMediator = dynamic_cast<ConcreteMediator *>(pMediator);
     pConcreteMediator->SetColleague1(pColleague1);
     pConcreteMediator->SetColleague2(pColleague2);
 
     wchar_t message[260] = L"Where are you from?";
     pColleague1->Send(message);
 
     return 0;
}