protected function resolveHandler($solverOrName) { if (!is_string($solverOrName)) { return $solverOrName; } $ex = null; $handler = null; try { $handler = $this->factory->create($solverOrName); } catch (Error $ex) { } catch (Exception $ex) { } if ($ex !== null) { throw new IllegalCallException("Tried to invoke [{$solverOrName}] which is undefined."); } return $handler; }