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<?php |
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/** |
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* TechDivision\Import\Observers\ObserverVisitor |
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* |
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* NOTICE OF LICENSE |
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* |
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* This source file is subject to the Open Software License (OSL 3.0) |
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* that is available through the world-wide-web at this URL: |
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* http://opensource.org/licenses/osl-3.0.php |
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* |
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* PHP version 5 |
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* |
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* @author Tim Wagner <[email protected]> |
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* @copyright 2016 TechDivision GmbH <[email protected]> |
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* @license http://opensource.org/licenses/osl-3.0.php Open Software License (OSL 3.0) |
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* @link https://github.com/techdivision/import |
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* @link http://www.techdivision.com |
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*/ |
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namespace TechDivision\Import\Observers; |
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use TechDivision\Import\Subjects\SubjectInterface; |
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use Symfony\Component\DependencyInjection\TaggedContainerInterface; |
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/** |
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* Visitor implementation for a subject's observers. |
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* |
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* @author Tim Wagner <[email protected]> |
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* @copyright 2016 TechDivision GmbH <[email protected]> |
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* @license http://opensource.org/licenses/osl-3.0.php Open Software License (OSL 3.0) |
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* @link https://github.com/techdivision/import |
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* @link http://www.techdivision.com |
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*/ |
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class ObserverVisitor implements ObserverVisitorInterface |
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{ |
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/** |
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* The DI container builder instance. |
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* |
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* @var \Symfony\Component\DependencyInjection\TaggedContainerInterface |
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*/ |
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protected $container; |
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/** |
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* The constructor to initialize the instance. |
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* |
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* @param \Symfony\Component\DependencyInjection\TaggedContainerInterface $container The container instance |
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*/ |
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public function __construct(TaggedContainerInterface $container) |
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{ |
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$this->container = $container; |
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} |
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/** |
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* Visitor implementation that initializes the observers of the passed subject. |
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* |
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* @param \TechDivision\Import\Subjects\SubjectInterface $subject The subject to initialize the observers for |
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* |
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* @return void |
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*/ |
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public function visit(SubjectInterface $subject) |
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{ |
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// load the observers from the configuration |
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$availableObservers = $subject->getConfiguration()->getObservers(); |
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// prepare the observers |
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foreach ($availableObservers as $observers) { |
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$this->prepareObservers($subject, $observers); |
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} |
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} |
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/** |
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* Prepare the observers defined in the system configuration. |
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* |
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* @param \TechDivision\Import\Subjects\SubjectInterface $subject The subject to prepare the observers for |
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* @param array $observers The array with the observers |
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* @param string $type The actual observer type |
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* |
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* @return void |
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*/ |
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protected function prepareObservers(SubjectInterface $subject, array $observers, $type = null) |
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{ |
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// iterate over the array with observers and prepare them |
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foreach ($observers as $key => $observer) { |
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// we have to initialize the type only on the first level |
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if ($type == null) { |
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$type = $key; |
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} |
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// query whether or not we've an subarry or not |
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if (is_array($observer)) { |
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$this->prepareObservers($subject, $observer, $type); |
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} else { |
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// create the instance of the observer/factory |
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$instance = $this->container->get($observer); |
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// query whether or not a factory has been specified |
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if ($instance instanceof ObserverInterface) { |
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$subject->registerObserver($instance, $type); |
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} elseif ($instance instanceof ObserverFactoryInterface) { |
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$subject->registerObserver($instance->createObserver($subject), $type); |
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} else { |
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throw new \InvalidArgumentException(); |
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} |
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} |
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} |
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} |
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} |
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