public static function check_value($value, $msg = null)
{
if (is_null(self::$instance)) {
self::$instance = new self();
}
BasicEnum::check_val(self::$instance, $value, $msg);
}
/** @brief Defines the origin of the query.
*
* @remark @c on_assignment method is not called by this method.
*
* @param $from [in] origin of the query. It should be a value defined by
* @a AfsOrigin.
*
* @return current instance.
* @exception Exception when provided origin value is invalid.
*/
public function set_from($from, $feed = null)
{
AfsOrigin::check_value($from, 'Invalid query origin: ');
$this->set_parameter('from', $from, $feed);
return $this;
}
