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<?php declare(strict_types=1); |
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/** |
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* This file is part of the php-state project. |
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* |
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* (c) Yannick Voyer <[email protected]> (http://github.com/yvoyer) |
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*/ |
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namespace Star\Component\State; |
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use Star\Component\State\Callbacks\AlwaysThrowExceptionOnFailure; |
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use Star\Component\State\Callbacks\TransitionCallback; |
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use Star\Component\State\Event\StateEventStore; |
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use Star\Component\State\Event\TransitionWasFailed; |
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use Star\Component\State\Event\TransitionWasSuccessful; |
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use Star\Component\State\Event\TransitionWasRequested; |
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final class StateMachine |
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{ |
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/** |
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* @var EventRegistry |
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*/ |
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private $listeners; |
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/** |
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* @var StateRegistry |
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*/ |
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private $states; |
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/** |
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* @var string |
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*/ |
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private $currentState; |
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public function __construct( |
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string $currentState, |
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StateRegistry $states, |
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EventRegistry $listeners |
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) { |
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$this->listeners = $listeners; |
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$this->states = $states; |
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$this->setCurrentState($currentState); |
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} |
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/** |
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* @param string $transitionName The transition name |
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* @param mixed $context |
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* @param TransitionCallback|null $callback |
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* |
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* @return string The next state to store on your context |
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* @throws InvalidStateTransitionException |
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* @throws NotFoundException |
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*/ |
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public function transit(string $transitionName, $context, TransitionCallback $callback = null): string |
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{ |
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if (! $callback) { |
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$callback = new AlwaysThrowExceptionOnFailure(); |
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} |
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$this->listeners->dispatch( |
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StateEventStore::BEFORE_TRANSITION, |
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new TransitionWasRequested($transitionName) |
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); |
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$transition = $this->states->getTransition($transitionName); |
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$callback->beforeStateChange($context, $this); |
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$newState = $transition->getDestinationState(); |
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$allowed = $this->states->transitionStartsFrom($transitionName, $this->currentState); |
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if (! $allowed) { |
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$exception = InvalidStateTransitionException::notAllowedTransition( |
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$transitionName, |
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$context, |
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$this->currentState |
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); |
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$this->listeners->dispatch( |
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StateEventStore::FAILURE_TRANSITION, |
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new TransitionWasFailed($transitionName, $exception) |
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); |
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$newState = $callback->onFailure($exception, $context, $this); |
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} |
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$this->setCurrentState($newState); |
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$callback->afterStateChange($context, $this); |
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$this->listeners->dispatch( |
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StateEventStore::AFTER_TRANSITION, |
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new TransitionWasSuccessful($transitionName) |
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); |
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return $this->currentState; |
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} |
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/** |
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* @param string $stateName |
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* @return bool |
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* @throws NotFoundException |
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*/ |
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public function isInState(string $stateName): bool |
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{ |
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if (! $this->states->hasState($stateName)) { |
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throw NotFoundException::stateNotFound($stateName); |
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} |
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return $this->currentState === $stateName; |
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} |
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public function hasAttribute(string $attribute): bool |
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{ |
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return $this->states->hasAttribute($this->currentState, $attribute); |
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} |
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public function addListener(string $event, \Closure $listener): void |
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{ |
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$this->listeners->addListener($event, $listener); |
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} |
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public function acceptTransitionVisitor(TransitionVisitor $visitor): void |
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{ |
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$this->states->acceptTransitionVisitor($visitor); |
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} |
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public function acceptStateVisitor(StateVisitor $visitor): void |
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{ |
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$this->states->acceptStateVisitor($visitor); |
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} |
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private function setCurrentState(string $state): void |
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{ |
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$this->currentState = $state; |
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} |
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} |
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yvoyer /
php-state
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