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<?php |
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/** |
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* This file is part of the miBadger package. |
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* |
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* @author Michael Webbers <[email protected]> |
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* @license http://opensource.org/licenses/Apache-2.0 Apache v2 License |
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*/ |
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namespace miBadger\Observer; |
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/** |
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* The subject trait of the observer pattern. |
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* |
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* @see http://en.wikipedia.org/wiki/Observer_pattern |
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* @since 1.0.0 |
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*/ |
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trait SubjectTrait |
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{ |
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/** @var ObserverInterface[] The attached observers. */ |
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private $observers = []; |
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/** |
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* Returns true if the observer is attached to the subject. |
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* |
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* @param ObserverInterface $observer |
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* @return bool true if the observer is attached to the subject. |
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*/ |
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public function isAttached(ObserverInterface $observer) |
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{ |
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return in_array($observer, $this->observers); |
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} |
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/** |
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* Returns true if the observer is attached successfully. |
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* |
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* @param ObserverInterface $observer |
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* @return bool true if the observer is attached successfully. |
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*/ |
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public function attach(ObserverInterface $observer) |
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{ |
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if ($this->isAttached($observer)) { |
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return false; |
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} |
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$this->observers[] = $observer; |
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return true; |
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} |
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/** |
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* Returns true if the observer is detached successfully. |
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* |
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* @param ObserverInterface $observer |
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* @return bool true if the observer is detached successfully. |
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*/ |
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public function detach(ObserverInterface $observer) |
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{ |
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foreach ($this->observers as $key => $value) { |
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if ($value === $observer) { |
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unset($this->observers[$key]); |
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return true; |
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} |
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} |
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return false; |
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} |
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/** |
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* Notify all the attached observers. |
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* |
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* @param mixed $arguments |
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* @return null |
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*/ |
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public function notify($arguments = null) |
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{ |
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foreach ($this->observers as $observer) { |
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$observer->update($this, $arguments); |
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} |
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} |
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} |
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miBadger /
miBadger.Observer
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