/**
* Return compiled machine
*
* @return Machine Machine instance
*/
public function getMachine()
{
$transitionChain = TransitionChain::create();
$transitionChain->addTransition(new Transition('pay', new State('unpaid'), new State('paid')))->addTransition(new Transition('revise', new State('unpaid'), new State('revised')))->addTransition(new Transition('ship', new State('revised'), new State('shipped')));
$machine = new Machine('id', $transitionChain, 'unpaid');
return $machine;
}
/**
* Compile next states of each state.
*
* @param TransitionChain $transitionChain Transition chain
*
* @return $this Self object
*
* @throws StateNotValidException state is not valid
*/
private function checkStates(TransitionChain $transitionChain)
{
/**
* @var Transition $transition
*/
foreach ($transitionChain->getTransitions() as $transition) {
$initialStateName = $transition->getStart()->getName();
if ($initialStateName === $this->pointOfEntry) {
continue;
}
if (!$this->transitionChain->getTransitionsByFinalState($initialStateName)) {
throw new StateNotValidException($initialStateName);
}
}
return $this;
}
/**
* Get available states given a start state
*
* @param string $startStateName Start state name
*
* @return array Set of states
*/
public function getAvailableStates($startStateName)
{
return array_filter($this->transitionChain->getTransitions(), function (Transition $transition) use($startStateName) {
return $transition->getStart()->getName() === $startStateName;
});
}