/**
* Return the requested object; might be cached.
* @param integer $id
* @return UNIQUE_OBJECT
*/
public function object_at_id($id)
{
$this->assert(!empty($id), 'ID cannot be empty (in ' . strtoupper(get_class($this->query)) . ')', 'object_at_id', 'QUERY_BASED_CACHE');
if (isset($this->_cache[$id])) {
return $this->_cache[$id];
}
$Result = $this->query->object_at_id($id);
$this->add_object($Result);
return $Result;
}
