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1 <?php
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2
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3 /*
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4 * This file is part of the Symfony package.
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5 *
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6 * (c) Fabien Potencier <fabien@symfony.com>
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7 *
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8 * For the full copyright and license information, please view the LICENSE
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9 * file that was distributed with this source code.
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10 */
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11
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12 namespace Symfony\Component\EventDispatcher;
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13
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14 /**
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15 * A read-only proxy for an event dispatcher.
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16 *
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17 * @author Bernhard Schussek <bschussek@gmail.com>
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18 */
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19 class ImmutableEventDispatcher implements EventDispatcherInterface
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20 {
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21 /**
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22 * The proxied dispatcher.
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23 *
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24 * @var EventDispatcherInterface
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25 */
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26 private $dispatcher;
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27
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28 /**
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29 * Creates an unmodifiable proxy for an event dispatcher.
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30 *
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31 * @param EventDispatcherInterface $dispatcher The proxied event dispatcher
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32 */
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33 public function __construct(EventDispatcherInterface $dispatcher)
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34 {
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35 $this->dispatcher = $dispatcher;
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36 }
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37
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38 /**
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39 * {@inheritdoc}
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40 */
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41 public function dispatch($eventName, Event $event = null)
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42 {
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43 return $this->dispatcher->dispatch($eventName, $event);
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44 }
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45
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46 /**
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47 * {@inheritdoc}
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48 */
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49 public function addListener($eventName, $listener, $priority = 0)
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50 {
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51 throw new \BadMethodCallException('Unmodifiable event dispatchers must not be modified.');
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52 }
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53
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54 /**
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55 * {@inheritdoc}
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56 */
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57 public function addSubscriber(EventSubscriberInterface $subscriber)
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58 {
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59 throw new \BadMethodCallException('Unmodifiable event dispatchers must not be modified.');
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60 }
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61
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62 /**
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63 * {@inheritdoc}
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64 */
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65 public function removeListener($eventName, $listener)
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66 {
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67 throw new \BadMethodCallException('Unmodifiable event dispatchers must not be modified.');
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68 }
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69
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70 /**
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71 * {@inheritdoc}
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72 */
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73 public function removeSubscriber(EventSubscriberInterface $subscriber)
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74 {
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75 throw new \BadMethodCallException('Unmodifiable event dispatchers must not be modified.');
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76 }
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77
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78 /**
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79 * {@inheritdoc}
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80 */
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81 public function getListeners($eventName = null)
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82 {
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83 return $this->dispatcher->getListeners($eventName);
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84 }
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85
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86 /**
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87 * {@inheritdoc}
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88 */
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89 public function getListenerPriority($eventName, $listener)
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90 {
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91 return $this->dispatcher->getListenerPriority($eventName, $listener);
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92 }
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93
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94 /**
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95 * {@inheritdoc}
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96 */
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97 public function hasListeners($eventName = null)
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98 {
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99 return $this->dispatcher->hasListeners($eventName);
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100 }
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101 }
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