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EventManagerAwareTrait.php
01 <?php
02 /**
03 * Zend Framework (http://framework.zend.com/)
04 *
05 * @link http://github.com/zendframework/zend-eventmanager for the canonical source repository
06 * @copyright Copyright (c) 2005-2015 Zend Technologies USA Inc. (http://www.zend.com)
07 * @license https://github.com/zendframework/zend-eventmanager/blob/master/LICENSE.md
08 */
09
10 namespace Zend\EventManager;
11
12 use Traversable;
13
14 /**
15 * A trait for objects that provide events.
16 *
17 * If you use this trait in an object, you will probably want to also implement
18 * EventManagerAwareInterface, which will make it so the default initializer in
19 * a ZF2 MVC application will automatically inject an instance of the
20 * EventManager into your object when it is pulled from the ServiceManager.
21 *
22 * @see Zend\Mvc\Service\ServiceManagerConfig
23 */
24 trait EventManagerAwareTrait
25 {
26 /**
27 * @var EventManagerInterface
28 */
29 protected $events;
30
31 /**
32 * Set the event manager instance used by this context.
33 *
34 * For convenience, this method will also set the class name / LSB name as
35 * identifiers, in addition to any string or array of strings set to the
36 * $this->eventIdentifier property.
37 *
38 * @param EventManagerInterface $events
39 */
40 public function setEventManager(EventManagerInterface $events)
41 {
42 $identifiers = [__CLASS__, get_class($this)];
43 if (isset($this->eventIdentifier)) {
44 if ((is_string($this->eventIdentifier))
45 || (is_array($this->eventIdentifier))
46 || ($this->eventIdentifier instanceof Traversable)
47 ) {
48 $identifiers = array_unique(array_merge($identifiers, (array) $this->eventIdentifier));
49 } elseif (is_object($this->eventIdentifier)) {
50 $identifiers[] = $this->eventIdentifier;
51 }
52 // silently ignore invalid eventIdentifier types
53 }
54 $events->setIdentifiers($identifiers);
55 $this->events = $events;
56 if (method_exists($this, 'attachDefaultListeners')) {
57 $this->attachDefaultListeners();
58 }
59 }
60
61 /**
62 * Retrieve the event manager
63 *
64 * Lazy-loads an EventManager instance if none registered.
65 *
66 * @return EventManagerInterface
67 */
68 public function getEventManager()
69 {
70 if (! $this->events instanceof EventManagerInterface) {
71 $this->setEventManager(new EventManager());
72 }
73 return $this->events;
74 }
75 }
76