gboolean cnd_register_class(const char *class_id,
_cnd_constr constr_func,
_cnd_destr destr_func,
_cnd_eval eval_func,
_cnd_reset reset_func) {
char *key = NULL;
_cnd_class *cls = NULL;
/* check for valid parameters */
if ((constr_func == NULL) || (destr_func == NULL) ||
(eval_func == NULL) || (reset_func == NULL) || (class_id == NULL))
return FALSE;
/* check if hash table is already initialized */
_cnd_init();
/* check for unique class id */
if (g_hash_table_lookup(classes, class_id) != NULL) {
g_warning("cnd_register_class: Duplicate class ID \"%s\"", class_id);
return FALSE;
}
/* GHashTable keys need to be persistent for the lifetime of the hash
table. Allocate memory and copy the class id which we use as key. */
key = g_strdup(class_id);
/* initialize class structure */
if ((cls = (_cnd_class*)g_malloc(sizeof(_cnd_class))) == NULL) {
g_free(key);
return FALSE;
}
cls->constr_func = constr_func;
cls->destr_func = destr_func;
cls->eval_func = eval_func;
cls->reset_func = reset_func;
/* insert new class */
g_hash_table_insert(classes, key, cls);
return TRUE;
} /* END cnd_register_class() */
condition* cnd_new(const char* class_id, ...){
va_list ap;
condition *cnd = NULL, *cnd_ref = NULL;
_cnd_class *cls = NULL;
char* id = NULL;
/* check if hash table is already initialized */
_cnd_init();
/* get class structure for this id */
if((cls = (_cnd_class*)g_hash_table_lookup(classes, class_id)) == NULL) {
g_warning("cnd_new: Couldn't find class ID \"%s\"", class_id);
return NULL;
}
/* initialize the basic structure */
if((cnd_ref = (condition*)g_malloc(sizeof(condition))) == NULL) return NULL;
cnd_ref->user_data = NULL;
cnd_ref->eval_func = cls->eval_func;
cnd_ref->reset_func = cls->reset_func;
cnd_ref->class_id = g_strdup(class_id);
/* perform class specific initialization */
va_start(ap, class_id);
cnd = (cls->constr_func)(cnd_ref, ap);
va_end(ap);
/* check for successful construction */
if(cnd == NULL){
g_free(cnd_ref);
g_free(id);
}
return cnd;
} /* END cnd_new() */
void cnd_delete(condition *cnd){
_cnd_class *cls = NULL;
const char* class_id;
/* check for valid pointer */
if(cnd == NULL) return;
class_id = cnd->class_id;
/* check if hash table is already initialized */
_cnd_init();
/* get the condition class */
cls = (_cnd_class*)g_hash_table_lookup(classes, class_id);
/* call class specific destructor */
if(cls != NULL) (cls->destr_func)(cnd);
/* free memory */
g_free(cnd->class_id);
/* free basic structure */
g_free(cnd);
} /* END cnd_delete() */
void cnd_unregister_class(const char* class_id) {
const char *key = (const char*)class_id;
_cnd_class *cls = NULL;
/* check if hash table is already initialized */
_cnd_init();
/* find the key for this class id and store it in 'pkey' */
g_hash_table_foreach(classes,
_cnd_find_hash_key_for_class_id,
(gpointer)key);
/* find the class structure for this class id */
cls = (_cnd_class*)g_hash_table_lookup(classes, class_id);
/* remove constructor from hash table */
g_hash_table_remove(classes, class_id);
/* free the key */
g_free(pkey);
pkey = NULL;
/* free the value */
g_free(cls);
} /* END cnd_unregister_class() */