#ifndef ABSTRACTION_H
#define ABSTRACTION_H
///////////////////////////////////////////////////////////////////////
//  Abstraction.h - Defines Abstraction interface and its Concrete   //
//                  derivatives (Abstraction, Refined Abstractions)  //
//                                                                   //
//  Skeleton for the BRIDGE PATTERN                                  //
//  Participants : Abstraction, Refined Abstractions,                //
//                 Implementor, Concrete implementors                //
//                                                                   //
//  ver 1.0                                                          //
//  Language:    Visual C++, ver 6.0,                                //
//  Platform:    Dell XPS1000r, Windows 2000 Professional            //
//  Author:      Jim Fawcett, CST 2-187, Syracuse Univ.              //
//  Source:                                                          //
//  Ivan Bernal/Wang Xiaoqiang                                       //
//  imbernal@syr.edu                                                 //
//  CSE791 - Design Patterns, Summer 2000                            //
///////////////////////////////////////////////////////////////////////

class Implementor;

class Abstraction {

  public: 
    enum eImpType { A, B};  //choose implementation
    
    Abstraction(eImpType impType);
    virtual void Operation()=0;
    virtual~ Abstraction();
  protected: 
    virtual Implementor* GetImplementor();
  private:
    Implementor* _imp;
};


class RefinedAbstraction1 : public Abstraction {

  public: 
    RefinedAbstraction1(eImpType impTYpe);
	  virtual ~RefinedAbstraction1();
	  virtual void Operation();
};


class RefinedAbstraction2 : public Abstraction {

  public: 
    RefinedAbstraction2(eImpType impTYpe);
    virtual ~RefinedAbstraction2();
    virtual void Operation();
};

#endif