/* Copyright (c) 2009 The Khronos Group Inc.

 *

 * Permission is hereby granted, free of charge, to any person obtaining a

 * copy of this software and/or associated documentation files (the

 * "Materials"), to deal in the Materials without restriction, including

 * without limitation the rights to use, copy, modify, merge, publish,

 * distribute, sublicense, and/or sell copies of the Materials, and to

 * permit persons to whom the Materials are furnished to do so, subject to

 * the following conditions:

 *

 * The above copyright notice and this permission notice shall be included

 * in all copies or substantial portions of the Materials.

 *

 * THE MATERIALS ARE PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,

 * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF

 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.

 * IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY

 * CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,

 * TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE

 * MATERIALS OR THE USE OR OTHER DEALINGS IN THE MATERIALS.

 */

#ifndef OWFOBJECT_H_

#define OWFOBJECT_H_

#include <stdlib.h>

#include "owftypes.h"

#include "owfdebug.h"

#ifdef __cplusplus

extern "C"

{

#endif

typedef void (*DESTRUCTOR)(void*);

typedef void (*CONSTRUCTOR)(void*);

typedef struct {

    const char*             type;

    DESTRUCTOR              destructor;

    OWFuint32               referenceCount;

    void*                   payload;

} OWF_OBJECT;

#define TYPE(x)             "" # x "_type"

/*! returns field offset within structure */

#define FOFF(x,y)           ((OWFuint32) &(((x*) 0x1000)->y) - 0x1000)

/*! returns pointer to wrapper object which holds object x */

#define _O(x)               ((OWF_OBJECT*) ((OWFuint32)(x) -\

                                           FOFF(OWF_OBJECT,payload)))

/*! create new object instance */

#define CREATE(x)           (x*) OWF_Object_Construct(sizeof(x), TYPE(x), \

                                                      & x##_Ctor, & x##_Dtor)

#define REFCOUNT(x)         ((x) ? _O(x)->referenceCount : 0xFFFFFFFF)

/*! get the type of the contained object  */

#define TYPEOF(x)           (_O(x)->type)

/*! increment object reference count  */

#define ADDREF(x,y) \

    if (y) {\

         _O(y)->referenceCount++; \

         DPRINT(("ADDREF: ref count of %s(%p) is now %d\n", TYPEOF(y), y, \

                 REFCOUNT(y)));\

    }\

    x = y;

/*! decrement object reference count, call destructor if count reaches zero  */

#define REMREF(x) \

    if (x) {\

        --_O(x)->referenceCount; \

        DPRINT(("REMREF: ref count of %s(%p) is now %d\n", TYPEOF(x), x, \

                REFCOUNT(x))); \

        if (0 == _O(x)->referenceCount) {\

            if (_O(x)->destructor) {\

                _O(x)->destructor(x);\

            }\

            xfree(_O(x));\

        }\

        x = NULL;\

    }

#define DESTROY(x) \

    REMREF(x); \

    x = NULL;

OWF_API_CALL void*

OWF_Object_Construct(size_t size,

                     const char* type,

                     CONSTRUCTOR ctor,

                     DESTRUCTOR dtor);

#ifdef __cplusplus

}

#endif

#endif /* OWFOBJECT_H_ */