forked from schmittjoh/serializer
/
EventDispatcher.php
126 lines (108 loc) · 4.19 KB
/
EventDispatcher.php
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<?php
/*
* Copyright 2013 Johannes M. Schmitt <schmittjoh@gmail.com>
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
namespace JMS\Serializer\EventDispatcher;
use JMS\Serializer\Exception\InvalidArgumentException;
/**
* Light-weight event dispatcher.
*
* This implementation focuses primarily on performance, and dispatching
* events for certain classes. It is not a general purpose event dispatcher.
*
* @author Johannes M. Schmitt <schmittjoh@gmail.com>
*/
class EventDispatcher implements EventDispatcherInterface
{
private $listeners = array();
private $classListeners = array();
private static function getDefaultMethodName($eventName)
{
return 'on' . str_replace(array('_', '.'), '', $eventName);
}
/**
* Sets the listeners.
*
* @param array $listeners
*/
public function setListeners(array $listeners)
{
$this->listeners = $listeners;
$this->classListeners = array();
}
public function addListener($eventName, $callable, $class = null, $format = null)
{
$this->listeners[$eventName][] = array($callable, null === $class ? null : strtolower($class), $format);
unset($this->classListeners[$eventName]);
}
public function addSubscriber(EventSubscriberInterface $subscriber)
{
foreach ($subscriber->getSubscribedEvents() as $eventData) {
if (!isset($eventData['event'])) {
throw new InvalidArgumentException(sprintf('Each event must have a "event" key.'));
}
$method = isset($eventData['method']) ? $eventData['method'] : self::getDefaultMethodName($eventData['event']);
$class = isset($eventData['class']) ? strtolower($eventData['class']) : null;
$format = isset($eventData['format']) ? $eventData['format'] : null;
$this->listeners[$eventData['event']][] = array(array($subscriber, $method), $class, $format);
unset($this->classListeners[$eventData['event']]);
}
}
public function hasListeners($eventName, $class, $format)
{
if (!isset($this->listeners[$eventName])) {
return false;
}
$loweredClass = strtolower($class);
if (!isset($this->classListeners[$eventName][$loweredClass][$format])) {
$this->classListeners[$eventName][$loweredClass][$format] = $this->initializeListeners($eventName, $loweredClass, $format);
}
return !!$this->classListeners[$eventName][$loweredClass][$format];
}
public function dispatch($eventName, $class, $format, Event $event)
{
if (!isset($this->listeners[$eventName])) {
return;
}
$loweredClass = strtolower($class);
if (!isset($this->classListeners[$eventName][$loweredClass][$format])) {
$this->classListeners[$eventName][$loweredClass][$format] = $this->initializeListeners($eventName, $loweredClass, $format);
}
foreach ($this->classListeners[$eventName][$loweredClass][$format] as $listener) {
call_user_func($listener, $event);
}
}
/**
* @param string $eventName
* @param string $loweredClass
* @param string $format
*
* @return array An array of listeners
*/
protected function initializeListeners($eventName, $loweredClass, $format)
{
$listeners = array();
foreach ($this->listeners[$eventName] as $listener) {
if (null !== $listener[1] && $loweredClass !== $listener[1]) {
continue;
}
if (null !== $listener[2] && $format !== $listener[2]) {
continue;
}
$listeners[] = $listener[0];
}
return $listeners;
}
}