/** 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();
}
}
