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<?php |
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/** |
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* @author: RunnerLee |
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* @email: [email protected] |
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* @time: 2018-02 |
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*/ |
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namespace Runner\Heshen; |
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use Runner\Heshen\Event\Event; |
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use Runner\Heshen\Support\StateEvents; |
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use Runner\Heshen\Exceptions\LogicException; |
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use Runner\Heshen\Contracts\StatefulInterface; |
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use Runner\Heshen\Exceptions\SetStateFailedException; |
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class Machine |
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{ |
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/** |
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* @var StatefulInterface |
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*/ |
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protected $stateful; |
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/** |
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* @var Blueprint |
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*/ |
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protected $blueprint; |
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/** |
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* Machine constructor. |
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* |
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* @param StatefulInterface $stateful |
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* @param Blueprint $blueprint |
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*/ |
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public function __construct(StatefulInterface $stateful, Blueprint $blueprint) |
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{ |
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$this->stateful = $stateful; |
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$this->blueprint = $blueprint; |
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} |
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/** |
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* @return string |
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*/ |
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public function getCurrentState(): string |
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{ |
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return $this->stateful->getState(); |
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} |
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/** |
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* @param $transitionName |
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* @param array $parameters |
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* |
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* @return bool |
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*/ |
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public function can($transitionName, array $parameters = []): bool |
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{ |
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return $this |
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->blueprint |
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->getTransition($transitionName) |
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->can($this->stateful, $parameters); |
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} |
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/** |
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* @param $transitionName |
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* @param array $parameters |
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*/ |
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public function apply($transitionName, array $parameters = []): void |
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{ |
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if (!$this->can($transitionName, $parameters)) { |
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throw new LogicException(sprintf( |
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'The "%s" transition can not be applied to the "%s" state of object "%s"', |
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$transitionName, |
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$this->stateful->getState(), |
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get_class($this->stateful) |
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)); |
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} |
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$this->dispatchEvent(StateEvents::PRE_TRANSITION . $transitionName, $parameters); |
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$transition = $this->blueprint->getTransition($transitionName); |
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$this->stateful->setState($transition->getToState()->getName()); |
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if ($this->stateful->getState() !== $transition->getToState()->getName()) { |
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throw new SetStateFailedException(sprintf( |
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'Failed to set the "%s" state for object "%s"', |
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$transition->getToState()->getName(), |
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get_class($this->stateful) |
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)); |
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} |
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$this->dispatchEvent(StateEvents::POST_TRANSITION . $transitionName, $parameters); |
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} |
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/** |
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* @return Blueprint |
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*/ |
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public function getBlueprint(): Blueprint |
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{ |
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return $this->blueprint; |
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} |
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/** |
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* @param $event |
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* @param array $parameters |
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*/ |
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protected function dispatchEvent($event, array $parameters = []): void |
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{ |
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$this->blueprint->getDispatcher()->dispatch($event, new Event($this->stateful, $parameters)); |
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} |
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} |
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RunnerLee /
heshen
