shells/materials/MaterialFactory.h

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/* -*- C++ -*- */
/*
 * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
 *
 *                                   Fehmi Cirak
 *                        California Institute of Technology
 *                           (C) 2005 All Rights Reserved
 *
 * <LicenseText>
 *
 * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
*/
#ifndef MATERIALFACTORY
#define MATERIALFACTORY
#include <map>
#include <cassert>
#include <string>


namespace shells {
    class MaterialFactory;
    class MaterialBase;
}


class shells::MaterialFactory { 
public:
    typedef MaterialBase* (*CreateMaterialCallBack)();
    
private:
    typedef std::map<std::string, CreateMaterialCallBack> _CallBackMap;
    
public:
    bool registerMaterial(std::string materialType, CreateMaterialCallBack cb);    
    MaterialBase* createMaterial(std::string& materialType) const;
    
// this is a singleton class
    static MaterialFactory * instance();
    void destroy(); 

private:
    MaterialFactory(){};
    ~MaterialFactory(){};
    static MaterialFactory *_instance;
    
// copy constructor and assignment operator
private:
    MaterialFactory (const MaterialFactory &);
    const MaterialFactory & operator=(const MaterialFactory &);
    
private:
    _CallBackMap     _callBacks;
};

#endif

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