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Edit File: AbstractHasDispatcher.php

<?php

namespace Guzzle\Common;

use Symfony\Component\EventDispatcher\EventDispatcher;
use Symfony\Component\EventDispatcher\EventDispatcherInterface;
use Symfony\Component\EventDispatcher\EventSubscriberInterface;

/**
 * Class that holds an event dispatcher
 */
class AbstractHasDispatcher implements HasDispatcherInterface
{
    /** @var EventDispatcherInterface */
    protected $eventDispatcher;

public static function getAllEvents()
    {
        return array();
    }

public function setEventDispatcher(EventDispatcherInterface $eventDispatcher)
    {
        $this->eventDispatcher = $eventDispatcher;

return $this;
    }

public function getEventDispatcher()
    {
        if (!$this->eventDispatcher) {
            $this->eventDispatcher = new EventDispatcher();
        }

return $this->eventDispatcher;
    }

public function dispatch($eventName, array $context = array())
    {
        return $this->getEventDispatcher()->dispatch($eventName, new Event($context));
    }

public function addSubscriber(EventSubscriberInterface $subscriber)
    {
        $this->getEventDispatcher()->addSubscriber($subscriber);

return $this;
    }
}

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