/**
* Adds a single transition to the state machine setup for a given event.
*
* @param TransitionInterface $transition
* @param string $event_name If the event name is omitted, then the transition will act as sequential.
*
* @return StateMachineBuilderInterface
*/
public function addTransition(TransitionInterface $transition, $event_name = '')
{
$transition_key = $event_name ?: StateMachine::SEQ_TRANSITIONS_KEY;
foreach ($transition->getIncomingStateNames() as $state_name) {
$this->allocateTransitionKey($state_name, $transition_key);
if (in_array($transition, $this->transitions[$state_name][$transition_key], true)) {
throw new VerificationError('Adding the same transition instance twice is not supported.');
}
$this->transitions[$state_name][$transition_key][] = $transition;
}
return $this;
}
