public function addTransition(Transition $transition)
{
if ($transition->getName() === null) {
throw new FsmException('The transition must have a name');
}
if (!isset($this->states[$transition->getFromStateName()])) {
throw new FsmException('The transition from state does not exists');
}
if (!isset($this->states[$transition->getToStateName()])) {
throw new FsmException('The transition to state does not exists');
}
$this->transitions[$transition->getName()] = $transition;
return $this;
}
