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<?php |
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namespace Finite\StateMachine; |
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use Finite\Event\FiniteEvents; |
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use Finite\Event\StateMachineEvent; |
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use Finite\Event\TransitionEvent; |
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use Finite\Exception; |
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use Finite\State\Accessor\PropertyPathStateAccessor; |
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use Finite\State\Accessor\StateAccessorInterface; |
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use Finite\State\State; |
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use Finite\State\StateInterface; |
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use Finite\Transition\Transition; |
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use Finite\Transition\TransitionInterface; |
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use Symfony\Component\EventDispatcher\EventDispatcher; |
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use Symfony\Component\EventDispatcher\EventDispatcherInterface; |
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/** |
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* The Finite State Machine |
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* |
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* @author Yohan Giarelli <[email protected]> |
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*/ |
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class StateMachine implements StateMachineInterface |
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{ |
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/** |
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* The stateful object |
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* |
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* @var object |
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*/ |
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protected $object; |
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/** |
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* The available states |
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* |
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* @var array |
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*/ |
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protected $states = array(); |
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/** |
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* The available transitions |
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* |
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* @var array |
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*/ |
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protected $transitions = array(); |
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/** |
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* The current state |
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* |
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* @var StateInterface |
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*/ |
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protected $currentState; |
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/** |
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* @var EventDispatcherInterface |
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*/ |
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protected $dispatcher; |
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/** |
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* @var StateAccessorInterface |
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*/ |
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protected $stateAccessor; |
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/** |
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* @var string |
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*/ |
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protected $graph; |
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/** |
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* @param object $object |
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* @param EventDispatcherInterface $dispatcher |
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* @param StateAccessorInterface $stateAccessor |
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*/ |
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public function __construct( |
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$object = null, |
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EventDispatcherInterface $dispatcher = null, |
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StateAccessorInterface $stateAccessor = null |
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) |
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{ |
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$this->object = $object; |
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$this->dispatcher = $dispatcher ?: new EventDispatcher; |
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$this->stateAccessor = $stateAccessor ?: new PropertyPathStateAccessor; |
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} |
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/** |
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* @{inheritDoc} |
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*/ |
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public function initialize() |
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{ |
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if (null === $this->object) { |
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throw new Exception\ObjectException('No object bound to the State Machine'); |
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} |
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try { |
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$initialState = $this->stateAccessor->getState($this->object); |
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} catch (Exception\NoSuchPropertyException $e) { |
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throw new Exception\ObjectException(sprintf( |
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'StateMachine can\'t be initialized because the defined property_path of object "%s" does not exist.', |
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get_class($this->object) |
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), $e->getCode(), $e); |
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} |
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if (null === $initialState) { |
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$initialState = $this->findInitialState(); |
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$this->stateAccessor->setState($this->object, $initialState); |
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$this->dispatcher->dispatch(FiniteEvents::SET_INITIAL_STATE, new StateMachineEvent($this)); |
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} |
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$this->currentState = $this->getState($initialState); |
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$this->dispatcher->dispatch(FiniteEvents::INITIALIZE, new StateMachineEvent($this)); |
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} |
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/** |
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* @{inheritDoc} |
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* |
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* @throws Exception\StateException |
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*/ |
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public function apply($transitionName) |
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{ |
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$transition = $this->getTransition($transitionName); |
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$event = new TransitionEvent($this->getCurrentState(), $transition, $this); |
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if (!$this->can($transition)) { |
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throw new Exception\StateException(sprintf( |
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'The "%s" transition can not be applied to the "%s" state of object "%s" with graph "%s".', |
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$transition->getName(), |
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$this->currentState->getName(), |
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get_class($this->getObject()), |
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$this->getGraph() |
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)); |
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} |
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$this->dispatcher->dispatch(FiniteEvents::PRE_TRANSITION, $event); |
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$this->dispatcher->dispatch(FiniteEvents::PRE_TRANSITION . '.' . $transitionName, $event); |
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$returnValue = $transition->process($this); |
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$this->stateAccessor->setState($this->object, $transition->getState()); |
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$this->currentState = $this->getState($transition->getState()); |
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$this->dispatcher->dispatch(FiniteEvents::POST_TRANSITION, $event); |
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$this->dispatcher->dispatch(FiniteEvents::POST_TRANSITION . '.' . $transitionName, $event); |
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return $returnValue; |
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} |
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/** |
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* @{inheritDoc} |
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*/ |
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public function can($transition) |
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{ |
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$transition = $transition instanceof TransitionInterface ? $transition : $this->getTransition($transition); |
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if (null !== $transition->getGuard() && !call_user_func($transition->getGuard(), $this)) { |
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return false; |
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} |
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if (!in_array($transition->getName(), $this->getCurrentState()->getTransitions())) { |
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return false; |
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} |
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$event = new TransitionEvent($this->getCurrentState(), $transition, $this); |
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$this->dispatcher->dispatch(FiniteEvents::TEST_TRANSITION, $event); |
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$this->dispatcher->dispatch(FiniteEvents::TEST_TRANSITION . '.' . $transition->getName(), $event); |
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return !$event->isRejected(); |
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} |
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/** |
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* @{inheritDoc} |
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*/ |
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public function addState($state) |
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{ |
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if (!$state instanceof StateInterface) { |
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$state = new State($state); |
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} |
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$this->states[$state->getName()] = $state; |
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} |
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/** |
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* @{inheritDoc} |
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*/ |
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public function addTransition($transition, $initialState = null, $finalState = null) |
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{ |
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if ((null === $initialState || null === $finalState) && !$transition instanceof TransitionInterface) { |
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throw new \InvalidArgumentException( |
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'You must provide a TransitionInterface instance or the $transition, ' . |
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'$initialState and $finalState parameters' |
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); |
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} |
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// If transition isn't a TransitionInterface instance, we create one from the states date |
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if (!$transition instanceof TransitionInterface) { |
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try { |
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$transition = $this->getTransition($transition); |
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} catch (Exception\TransitionException $e) { |
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$transition = new Transition($transition, $initialState, $finalState); |
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} |
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} |
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$this->transitions[$transition->getName()] = $transition; |
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// We add missings states to the State Machine |
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try { |
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$this->getState($transition->getState()); |
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} catch (Exception\StateException $e) { |
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$this->addState($transition->getState()); |
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} |
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foreach ($transition->getInitialStates() as $state) { |
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try { |
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$this->getState($state); |
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} catch (Exception\StateException $e) { |
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$this->addState($state); |
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} |
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$state = $this->getState($state); |
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if ($state instanceof State) { |
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$state->addTransition($transition); |
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} |
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} |
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} |
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/** |
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* @{inheritDoc} |
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*/ |
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public function getTransition($name) |
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{ |
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if (!isset($this->transitions[$name])) { |
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throw new Exception\TransitionException(sprintf( |
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'Unable to find a transition called "%s" on object "%s" with graph "%s".', |
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$name, |
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get_class($this->getObject()), |
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$this->getGraph() |
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)); |
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} |
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return $this->transitions[$name]; |
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} |
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/** |
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* @{inheritDoc} |
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*/ |
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public function getState($name) |
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{ |
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$name = (string) $name; |
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if (!isset($this->states[$name])) { |
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throw new Exception\StateException(sprintf( |
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'Unable to find a state called "%s" on object "%s" with graph "%s".', |
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$name, |
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get_class($this->getObject()), |
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$this->getGraph() |
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)); |
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} |
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return $this->states[$name]; |
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} |
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/** |
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* @{inheritDoc} |
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*/ |
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public function getTransitions() |
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{ |
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return array_keys($this->transitions); |
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} |
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/** |
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* @{inheritDoc} |
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*/ |
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public function getStates() |
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{ |
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return array_keys($this->states); |
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} |
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/** |
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* {@inheritDoc} |
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*/ |
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public function setObject($object) |
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{ |
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$this->object = $object; |
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} |
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/** |
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* @{inheritDoc} |
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*/ |
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public function getObject() |
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{ |
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return $this->object; |
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} |
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/** |
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* @{inheritDoc} |
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*/ |
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public function getCurrentState() |
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{ |
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return $this->currentState; |
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} |
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297
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/** |
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* Find and return the Initial state if exists |
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* |
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* @return string |
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* |
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* @throws Exception\StateException |
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*/ |
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protected function findInitialState() |
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{ |
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foreach ($this->states as $state) { |
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if (State::TYPE_INITIAL === $state->getType()) { |
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return $state->getName(); |
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} |
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} |
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throw new Exception\StateException(sprintf( |
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'No initial state found on object "%s" with graph "%s".', |
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get_class($this->getObject()), |
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$this->getGraph() |
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)); |
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} |
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/** |
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* @param EventDispatcherInterface $dispatcher |
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*/ |
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public function setDispatcher(EventDispatcherInterface $dispatcher) |
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{ |
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$this->dispatcher = $dispatcher; |
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} |
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/** |
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* @return EventDispatcherInterface |
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*/ |
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public function getDispatcher() |
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{ |
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return $this->dispatcher; |
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} |
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/** |
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* @param StateAccessorInterface $stateAccessor |
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*/ |
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public function setStateAccessor(StateAccessorInterface $stateAccessor) |
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{ |
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$this->stateAccessor = $stateAccessor; |
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} |
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343
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/** |
344
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* @{inheritDoc} |
345
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*/ |
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public function setGraph($graph) |
347
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{ |
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$this->graph = $graph; |
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} |
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351
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/** |
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* @{inheritDoc} |
353
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*/ |
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public function getGraph() |
355
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{ |
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return $this->graph; |
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} |
358
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} |
359
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