1246503e55
This in effect removes the direct link between event name and the method name on the handler. Any callback can be given as a handler and the event name becomes an arbitrary string. Allowing for easier namespacing (see next commit)
199 lines
6.3 KiB
PHP
199 lines
6.3 KiB
PHP
<?php
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/*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
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* A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
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* OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
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* LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
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* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*
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* This software consists of voluntary contributions made by many individuals
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* and is licensed under the LGPL. For more information, see
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* <http://www.doctrine-project.org>.
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*/
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namespace Symfony\Component\EventDispatcher;
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/**
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* The EventDispatcherInterface is the central point of Symfony's event listener system.
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*
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* Listeners are registered on the manager and events are dispatched through the
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* manager.
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*
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* @license http://www.opensource.org/licenses/lgpl-license.php LGPL
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* @author Guilherme Blanco <guilhermeblanco@hotmail.com>
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* @author Jonathan Wage <jonwage@gmail.com>
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* @author Roman Borschel <roman@code-factory.org>
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* @author Bernhard Schussek <bschussek@gmail.com>
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* @author Fabien Potencier <fabien@symfony.com>
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* @author Jordi Boggiano <j.boggiano@seld.be>
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*
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* @api
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*/
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class EventDispatcher implements EventDispatcherInterface
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{
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private $listeners = array();
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private $sorted = array();
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/**
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* @see EventDispatcherInterface::dispatch
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*
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* @api
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*/
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public function dispatch($eventName, Event $event = null)
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{
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if (!isset($this->listeners[$eventName])) {
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return;
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}
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if (null === $event) {
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$event = new Event();
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}
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$this->doDispatch($this->getListeners($eventName), $eventName, $event);
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}
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/**
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* @see EventDispatcherInterface::getListeners
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*
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* @api
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*/
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public function getListeners($eventName = null)
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{
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if (null !== $eventName) {
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if (!isset($this->sorted[$eventName])) {
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$this->sortListeners($eventName);
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}
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return $this->sorted[$eventName];
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}
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foreach (array_keys($this->listeners) as $eventName) {
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if (!isset($this->sorted[$eventName])) {
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$this->sortListeners($eventName);
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}
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if ($this->sorted[$eventName]) {
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$sorted[$eventName] = $this->sorted[$eventName];
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}
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}
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return $this->sorted;
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}
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/**
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* @see EventDispatcherInterface::hasListeners
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*
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* @api
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*/
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public function hasListeners($eventName = null)
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{
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return (Boolean) count($this->getListeners($eventName));
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}
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/**
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* @see EventDispatcherInterface::addListener
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*
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* @api
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*/
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public function addListener($eventName, $listener, $priority = 0)
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{
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$this->listeners[$eventName][$priority][] = $listener;
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unset($this->sorted[$eventName]);
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}
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/**
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* @see EventDispatcherInterface::removeListener
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*/
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public function removeListener($eventName, $listener)
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{
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if (!isset($this->listeners[$eventName])) {
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return;
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}
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foreach ($this->listeners[$eventName] as $priority => $listeners) {
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if (false !== ($key = array_search($listener, $listeners))) {
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unset($this->listeners[$eventName][$priority][$key], $this->sorted[$eventName]);
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}
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}
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}
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/**
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* @see EventDispatcherInterface::addSubscriber
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*/
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public function addSubscriber(EventSubscriberInterface $subscriber, $priority = 0)
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{
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foreach ((array) $subscriber->getSubscribedEvents() as $eventName => $method) {
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if (is_numeric($eventName)) {
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$eventName = $method;
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}
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$this->addListener($eventName, array($subscriber, $method), $priority);
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}
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}
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/**
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* @see EventDispatcherInterface::removeSubscriber
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*/
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public function removeSubscriber(EventSubscriberInterface $subscriber)
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{
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foreach ((array) $subscriber->getSubscribedEvents() as $eventName => $method) {
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if (is_numeric($eventName)) {
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$eventName = $method;
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}
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$this->removeListener($eventName, array($subscriber, $method));
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}
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}
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/**
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* Triggers the listeners of an event.
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*
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* This method can be overridden to add functionality that is executed
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* for each listener.
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*
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* @param array[callback] $listeners The event listeners.
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* @param string $eventName The name of the event to dispatch.
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* @param Event $event The event object to pass to the event handlers/listeners.
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*/
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protected function doDispatch($listeners, $eventName, Event $event)
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{
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foreach ($listeners as $listener) {
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// TODO: remove this before final release, temporary transitional code
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if (is_object($listener) && method_exists($listener, $eventName)) {
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$listener->$eventName($event);
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//trigger_error('Event listeners should now be registered using a complete callback as the listener instead of just an instance. Adjust your code ASAP.', E_USER_DEPRECATED);
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} else {
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// only this call should remain
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call_user_func($listener, $event);
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}
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if ($event->isPropagationStopped()) {
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break;
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}
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}
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}
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/**
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* Sorts the internal list of listeners for the given event by priority.
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*
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* @param string $eventName The name of the event.
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*/
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private function sortListeners($eventName)
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{
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$this->sorted[$eventName] = array();
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if (isset($this->listeners[$eventName])) {
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krsort($this->listeners[$eventName]);
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foreach ($this->listeners[$eventName] as $listeners) {
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foreach ($listeners as $listener) {
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$this->sorted[$eventName][] = $listener;
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}
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}
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}
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}
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}
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