public function getObjectByBackendId($obid)
{
$obids = $this->getBackendToObject();
if (isset($obids[$obid])) {
$objects = $this->getObjects();
return $objects[$obids[$obid]];
} else {
throw new Horde_Kolab_Storage_Exception(sprintf('No such object %s!', $obid));
}
}