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Rev | Author | Line No. | Line |
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115 | office | 1 | <?php |
2 | |||
3 | namespace Alchemy\BinaryDriver\Listeners; |
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4 | |||
5 | use SplObjectStorage; |
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6 | use Evenement\EventEmitter; |
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7 | |||
8 | class Listeners extends EventEmitter |
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9 | { |
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10 | /** @var SplObjectStorage */ |
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11 | public $storage; |
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12 | |||
13 | public function __construct() |
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14 | { |
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15 | $this->storage = new SplObjectStorage(); |
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16 | } |
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17 | |||
18 | public function __clone() |
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19 | { |
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20 | $storage = $this->storage; |
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21 | $this->storage = new SplObjectStorage(); |
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22 | $this->storage->addAll($storage); |
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23 | } |
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24 | |||
25 | /** |
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26 | * Registers a listener, pass the listener events to the target. |
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27 | * |
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28 | * @param ListenerInterface $listener |
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29 | * @param null|EventEmitter $target |
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30 | * |
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31 | * @return ListenersInterface |
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32 | */ |
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33 | public function register(ListenerInterface $listener, EventEmitter $target = null) |
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34 | { |
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35 | $EElisteners = array(); |
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36 | |||
37 | if (null !== $target) { |
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38 | $EElisteners = $this->forwardEvents($listener, $target, $listener->forwardedEvents()); |
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39 | } |
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40 | |||
41 | $this->storage->attach($listener, $EElisteners); |
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42 | |||
43 | return $this; |
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44 | } |
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45 | |||
46 | /** |
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47 | * Unregisters a listener, removes the listener events from the target. |
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48 | * |
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49 | * @param ListenerInterface $listener |
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50 | * |
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51 | * @return ListenersInterface |
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52 | * |
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53 | * @throws InvalidArgumentException In case the listener is not registered |
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54 | */ |
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55 | public function unregister(ListenerInterface $listener) |
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56 | { |
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57 | if (!isset($this->storage[$listener])) { |
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58 | throw new InvalidArgumentException('Listener is not registered.'); |
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59 | } |
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60 | |||
61 | foreach ($this->storage[$listener] as $event => $EElistener) { |
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62 | $listener->removeListener($event, $EElistener); |
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63 | } |
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64 | |||
65 | $this->storage->detach($listener); |
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66 | |||
67 | return $this; |
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68 | } |
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69 | |||
70 | private function forwardEvents($source, $target, array $events) |
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71 | { |
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72 | $EElisteners = array(); |
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73 | |||
74 | foreach ($events as $event) { |
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75 | $listener = $this->createListener($event, $target); |
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76 | $source->on($event, $EElisteners[$event] = $listener); |
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77 | } |
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78 | |||
79 | return $EElisteners; |
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80 | } |
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81 | |||
82 | private function createListener($event, $target) |
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83 | { |
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84 | return function () use ($event, $target) { |
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85 | $target->emit($event, func_get_args()); |
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86 | }; |
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87 | } |
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88 | } |