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37
vendor/doctrine/event-manager/src/EventArgs.php
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37
vendor/doctrine/event-manager/src/EventArgs.php
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<?php
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declare(strict_types=1);
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namespace Doctrine\Common;
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/**
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* EventArgs is the base class for classes containing event data.
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*
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* This class contains no event data. It is used by events that do not pass state
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* information to an event handler when an event is raised. The single empty EventArgs
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* instance can be obtained through {@link getEmptyInstance}.
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*/
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class EventArgs
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{
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/**
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* Single instance of EventArgs.
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*/
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private static EventArgs|null $emptyEventArgsInstance = null;
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/**
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* Gets the single, empty and immutable EventArgs instance.
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*
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* This instance will be used when events are dispatched without any parameter,
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* like this: EventManager::dispatchEvent('eventname');
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*
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* The benefit from this is that only one empty instance is instantiated and shared
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* (otherwise there would be instances for every dispatched in the abovementioned form).
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*
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* @link https://msdn.microsoft.com/en-us/library/system.eventargs.aspx
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* @see EventManager::dispatchEvent
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*/
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public static function getEmptyInstance(): EventArgs
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{
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return self::$emptyEventArgsInstance ??= new EventArgs();
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}
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}
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129
vendor/doctrine/event-manager/src/EventManager.php
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129
vendor/doctrine/event-manager/src/EventManager.php
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<?php
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declare(strict_types=1);
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namespace Doctrine\Common;
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use function spl_object_hash;
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/**
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* The EventManager is the central point of Doctrine's event listener system.
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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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class EventManager
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{
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/**
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* Map of registered listeners.
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* <event> => <listeners>
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*
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* @var array<string, object[]>
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*/
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private array $listeners = [];
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/**
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* Dispatches an event to all registered listeners.
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*
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* @param string $eventName The name of the event to dispatch. The name of the event is
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* the name of the method that is invoked on listeners.
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* @param EventArgs|null $eventArgs The event arguments to pass to the event handlers/listeners.
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* If not supplied, the single empty EventArgs instance is used.
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*/
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public function dispatchEvent(string $eventName, EventArgs|null $eventArgs = null): void
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{
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if (! isset($this->listeners[$eventName])) {
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return;
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}
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$eventArgs ??= EventArgs::getEmptyInstance();
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foreach ($this->listeners[$eventName] as $listener) {
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$listener->$eventName($eventArgs);
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}
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}
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/**
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* Gets the listeners of a specific event.
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*
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* @param string $event The name of the event.
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*
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* @return object[]
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*/
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public function getListeners(string $event): array
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{
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return $this->listeners[$event] ?? [];
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}
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/**
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* Gets all listeners keyed by event name.
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*
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* @return array<string, object[]> The event listeners for the specified event, or all event listeners.
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*/
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public function getAllListeners(): array
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{
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return $this->listeners;
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}
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/**
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* Checks whether an event has any registered listeners.
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*/
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public function hasListeners(string $event): bool
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{
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return ! empty($this->listeners[$event]);
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}
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/**
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* Adds an event listener that listens on the specified events.
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*
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* @param string|string[] $events The event(s) to listen on.
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* @param object $listener The listener object.
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*/
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public function addEventListener(string|array $events, object $listener): void
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{
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// Picks the hash code related to that listener
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$hash = spl_object_hash($listener);
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foreach ((array) $events as $event) {
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// Overrides listener if a previous one was associated already
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// Prevents duplicate listeners on same event (same instance only)
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$this->listeners[$event][$hash] = $listener;
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}
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}
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/**
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* Removes an event listener from the specified events.
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*
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* @param string|string[] $events
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*/
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public function removeEventListener(string|array $events, object $listener): void
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{
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// Picks the hash code related to that listener
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$hash = spl_object_hash($listener);
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foreach ((array) $events as $event) {
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unset($this->listeners[$event][$hash]);
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}
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}
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/**
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* Adds an EventSubscriber.
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*
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* The subscriber is asked for all the events it is interested in and added
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* as a listener for these events.
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*/
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public function addEventSubscriber(EventSubscriber $subscriber): void
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{
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$this->addEventListener($subscriber->getSubscribedEvents(), $subscriber);
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}
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/**
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* Removes an EventSubscriber.
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*
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* The subscriber is asked for all the events it is interested in and removed
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* as a listener for these events.
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*/
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public function removeEventSubscriber(EventSubscriber $subscriber): void
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{
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$this->removeEventListener($subscriber->getSubscribedEvents(), $subscriber);
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}
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}
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21
vendor/doctrine/event-manager/src/EventSubscriber.php
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21
vendor/doctrine/event-manager/src/EventSubscriber.php
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@@ -0,0 +1,21 @@
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<?php
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declare(strict_types=1);
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namespace Doctrine\Common;
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/**
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* An EventSubscriber knows what events it is interested in.
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* If an EventSubscriber is added to an EventManager, the manager invokes
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* {@link getSubscribedEvents} and registers the subscriber as a listener for all
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* returned events.
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*/
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interface EventSubscriber
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{
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/**
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* Returns an array of events this subscriber wants to listen to.
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*
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* @return string[]
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*/
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public function getSubscribedEvents();
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}
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