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LazyEventListener.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 Interop\Container\ContainerInterface;
13
14 /**
15 * Lazy listener instance for use with LazyListenerAggregate.
16 *
17 * Used as an internal class for the LazyAggregate to allow lazy creation of
18 * listeners via a dependency injection container.
19 *
20 * Lazy event listener definitions add the following members to what the
21 * LazyListener accepts:
22 *
23 * - event: the event name to attach to.
24 * - priority: the priority at which to attach the listener, if not the default.
25 */
26 class LazyEventListener extends LazyListener
27 {
28 /**
29 * @var string Event name to which to attach.
30 */
31 private $event;
32
33 /**
34 * @var null|int Priority at which to attach.
35 */
36 private $priority;
37
38 /**
39 * @param array $definition
40 * @param ContainerInterface $container
41 * @param array $env
42 */
43 public function __construct(array $definition, ContainerInterface $container, array $env = [])
44 {
45 parent::__construct($definition, $container, $env);
46
47 if ((! isset($definition['event'])
48 || ! is_string($definition['event'])
49 || empty($definition['event']))
50 ) {
51 throw new Exception\InvalidArgumentException(
52 'Lazy listener definition is missing a valid "event" member; cannot create LazyListener'
53 );
54 }
55
56 $this->event = $definition['event'];
57 $this->priority = isset($definition['priority']) ? (int) $definition['priority'] : null;
58 }
59
60 /**
61 * @return string
62 */
63 public function getEvent()
64 {
65 return $this->event;
66 }
67
68 /**
69 * @return int
70 */
71 public function getPriority($default = 1)
72 {
73 return (null !== $this->priority) ? $this->priority : $default;
74 }
75 }
76