/** get all ids of the selected items as an array * this method returns all ids of the selected items limited by the limits as an array. * if no items are loaded, the ids are loaded from the database * depends on _performQuery(), which must be overwritten * * @return array $this->_id_array id array of selected materials */ function getIDArray() { if ($this->_isAvailable()) { return parent::getIDArray(); } else { return array(); } }