vclassregistry.h

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/*
Copyright c1997-2014 Trygve Isaacson. All rights reserved.
This file is part of the Code Vault version 4.1
http://www.bombaydigital.com/
License: MIT. See LICENSE.md in the Vault top level directory.
*/

#ifndef vclassregistry_h
#define vclassregistry_h

#include "vstring.h"

class VClassFactory;
typedef std::vector<const VClassFactory*> VClassFactoryPtrVector;    

class VClassRegistry {
    public:

        static VClassRegistry* registry();

        VClassRegistry();
        virtual ~VClassRegistry();

        void* instantiateObject(const VString& classID) const;
        void registerClass(const VClassFactory* factory);
        const VClassFactory* findClassFactory(const VString& classID) const;

    private:

        VClassFactoryPtrVector mFactories; 

        static VClassRegistry* gRegistry;  
};

class VClassFactory {
    public:

        VClassFactory(const VString& classID);
        virtual ~VClassFactory() {}

        virtual void* instantiateObject() const = 0;
        bool matchesClassID(const VString& classID) const;
        void getClassID(VString& classID) const;

    private:

        VString mClassID;    
};

#define DEFINE_CLASSFACTORY(classname, factoryname) \
class factoryname : public VClassFactory { \
    public: \
 \
        static factoryname gFactory; \
 \
        factoryname(const VString& classID) \
            : VClassFactory(classID) \
            { \
            VClassRegistry::registry()->registerClass(this); \
        } \
 \
        virtual ~factoryname() {} \
 \
        virtual void* instantiateObject() const { return new classname(); } \
 \
}

#define DECLARE_CLASSFACTORY(classname, factoryname) factoryname factoryname::gFactory(#classname)

#endif /* vclassregistry_h */