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Register.h

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/*
    File:       Register.h

    Function:   Class registry

    Author:     Andrew Willmott
*/

#ifndef __Register__
#define __Register__

#include "cl/Basics.h"
#include "cl/Array.h"

typedef UInt32 ClassID;
typedef Void *(*ObjectCreator)();

struct RegistryEntry
{
    ClassID         baseID;
    ClassID         id;
    ObjectCreator   creator;
    const Char      *name;
    const Char      *description;
};

typedef Array<RegistryEntry>    ClassTable;

struct BaseEntry
{
    ClassID     baseID;
    ClassTable  table;
};

typedef Array<BaseEntry>        BaseTable;

class Register
{
public:
    Register(
        ClassID         id,       
        ObjectCreator   creator,       
        const           Char *name = "untitled",    
        const           Char *description = 0
    ) { RegisterClass('none', id, creator, name, description); };
    
    Register(
        ClassID         baseID, 
        ClassID         id,       
        ObjectCreator   creator,       
        const           Char *name = "untitled",    
        const           Char *description = 0
    ) { RegisterClass(baseID, id, creator, name, description); };


    static Void     RegisterClass(
        ClassID         baseID, 
        ClassID         id,       
        ObjectCreator   creator,       
        const           Char *name = "untitled",    
        const           Char *description = 0
    );

    static Void     *MakeObject(ClassID id);
    static Void     *MakeObject(const Char *name);
    static Void     *MakeObject(ClassID baseID, ClassID id);
    static Void     *MakeObject(ClassID baseID, const Char *name);
    static Void     ListObjects();
    static Void     ListObjects(ClassID baseID);
    
protected:
    static ClassTable   *FindClassTable(ClassID baseID);
    static BaseTable    *table;
};

#define MAKE_REGISTRAR(REGISTRAR, BASE_ID)                              \
    class REGISTRAR : public Register                                   \
    {                                                                   \
    public:                                                             \
        REGISTRAR(                                                      \
            ClassID         id,                                         \
            ObjectCreator   creator,                                    \
            const           Char *name = "untitled",                    \
            const           Char *description = 0                       \
        ) : Register(BASE_ID, id, creator, name, description) {};       \
    }

#endif

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