/**
 * \file
 * cclass.c: basic "class-like" handling of code and data structures
 * Copyright (C) 2011  Georg Hopp
 *
 * This program is free software: you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation, either version 3 of the License, or
 * (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program.  If not, see <http://www.gnu.org/licenses/>.
 */

#include <stdarg.h>
#include <string.h>
#include <stdlib.h>
#include <json/json.h>

#include "cclass.h"

#undef __construct
#undef __clear
#undef __destruct
#undef __jsonConst
#undef __toJson

void *
_new(const CCLASS _class, ...)
{
    const CCLASS class = _class;
    void * object      = calloc(1, class->size + sizeof(CCLASS));

    * (const struct _CCLASS **)object = class;
    object += sizeof(CCLASS);

    if (class->__construct) {
        va_list params;

        va_start(params, _class);
        class->__construct(object, &params);
        va_end(params);
    }

    return object;
}

void *
_newFromJson(const CCLASS _class, struct json_object * json)
{
    const CCLASS class = _class;
    void * object      = calloc(1, class->size + sizeof(CCLASS));

    * (const struct _CCLASS **) object = class;
    object += sizeof(CCLASS);

    if (class->__jsonConst && json) {
        class->__jsonConst(object, json);
    }

    return object;
}

int
_instanceOf(const CCLASS _class, void * _object)
{
    const CCLASS * class = _object - sizeof(CCLASS);

    return (class && _class == *class);
}


void
clear(void * _object)
{
    const CCLASS * class = _object - sizeof(CCLASS);

    if (_object && *class && (*class)->__clear) {
        (*class)->__clear(_object);
    }
}

void
delete(void * _object)
{
    const CCLASS * class = (*(void**)_object) - sizeof(CCLASS);

    if (*(void**)_object && *class && (*class)->__destruct) {
        (*class)->__destruct(*(void**)_object);
    }

    free((void *)class);
    *(void**)_object = NULL;
}

void
toJson(void * _object, struct json_object ** json)
{
    const CCLASS * class = _object - sizeof(CCLASS);

    if (_object && *class && (*class)->__toJson) {
        (*class)->__toJson(_object, json);
    }
}

int
isObject(void * _object)
{
    const CCLASS * class = _object - sizeof(CCLASS);

    return (_object && (*class) && CCLASS_MAGIC == (*class)->magic);
}

// vim: set et ts=4 sw=4: