/**
* Create an auxiliar instance (as singleton)
*
* @param string $classname
*/
static final function createAuxiliarEngine(&$from = null)
{
if (is_null($from)) {
$classname = self::$__super_class;
} else {
$classname = get_class($from);
}
if (!is_null(self::$__engine)) {
if (get_class(self::$__engine) != $classname) {
self::$__engine = null;
}
}
if (is_null(self::$__engine)) {
if (self::$__log_mode) {
self::log("createAuxiliarEngine: A new {$classname} instance will be created ...");
}
$tmp = self::$__discard_file_system;
self::$__discard_file_system = true;
self::$__engine = new $classname("", array());
if (!is_null($from)) {
self::$__engine->__items = $from->__items;
self::$__engine->__items_orig = $from->__items_orig;
}
self::$__discard_file_system = $tmp;
}
}