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cObjectIdentification.h

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/******************************************************************************/
/*                                                                            */
/* POLiTe - Persistent Object Library Test                                    */
/*                                        Ph.D. Thesis by Mgr. Michal Kopecky */
/*                                                                            */
/* Charles University Prague                                                  */
/*                                                                            */
/******************************************************************************/
/*                                                                            */
/* File name: ...                                                             */
/* Module: ......                                                             */
/*                                                                            */
/******************************************************************************/

#ifndef __C_OBJECTIDENTIFICATION_H__
#define __C_OBJECTIDENTIFICATION_H__

// Common POLiTe Header(s)
#include <lDefs.h>
#include <lTrace.h>
#include <lTypes.h>
#include <lStr.h>                                               // String class header

class DLL_External ObjectIdentification
{
#ifdef POLITE_TEST_FRIEND
        friend POLITE_TEST_FRIEND;
#endif // POLITE_TEST_FRIEND

friend class RefBase;
friend class ResultBase;
friend class Object;
friend class ProtoBase;
friend class ObjectBuffer;

protected:
        union {
                class ProtoBase *_prototype;
                const class Object *_object;
    };
        char *_SelectKeyValues;

public:
        ObjectIdentification();
        // Construct empty identification (IDNULL)

        ObjectIdentification(
                class ProtoBase *aPrototype,
                char * const aSelectKeyValues
                );
        // Construct non-empty identification
        // thet identifies object stored in the database

        ObjectIdentification(
                const class Object *anObject
                );
        // Construct non-empty identification
        // that identifies object in the memory only

        ObjectIdentification(
                const long anOid,
                class ProtoBase *aPrototype
                );
        // Construct non-empty identification
        // thet identifies object stored in the database

        ObjectIdentification(
                const ObjectIdentification &X
                );
        // Construct copy of an identification X

        virtual ~ObjectIdentification();

protected:
        virtual bool _Init(
                class ProtoBase *aPrototype,
                char * const aSelectKeyValues
                );
        // Re-initializes already existing identification

        virtual bool _Init(
                const class Object *anObject
                );
        // Re-initializes already existing identification

public:
        virtual class ProtoBase *Prototype() const;
        // Returns pointer to prototype instance of the target class

        virtual bool operator ==(
                const ObjectIdentification &X
                ) const;

        virtual bool operator !=(
                const ObjectIdentification &X
                ) const;

        virtual ObjectIdentification &operator =(
                const ObjectIdentification &X
                );
};

extern const ObjectIdentification IDNULL;
//NULL identification - identifies nothing

#endif //__C_OBJECTIDENTIFICATION_H__

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