/**
* @param StateInterface $sourceState
* @param TransitionInterface $sourceTransition
*
* @throws \InvalidArgumentException
*/
protected function addTransition(StateInterface $sourceState, TransitionInterface $sourceTransition)
{
if ($sourceState instanceof State) {
$sourceState->addTransition($sourceTransition);
} else {
throw new \InvalidArgumentException('Overwrite this method to implement a different type!');
}
}
