Actualización

vendor/doctrine/event-manager/src/EventArgs.php

@@ -0,0 +1,45 @@
+<?php
+
+declare(strict_types=1);
+
+namespace Doctrine\Common;
+
+/**
+ * EventArgs is the base class for classes containing event data.
+ *
+ * This class contains no event data. It is used by events that do not pass state
+ * information to an event handler when an event is raised. The single empty EventArgs
+ * instance can be obtained through {@link getEmptyInstance}.
+ */
+class EventArgs
+{
+    /**
+     * Single instance of EventArgs.
+     *
+     * @var EventArgs|null
+     */
+    private static $_emptyEventArgsInstance;
+
+    /**
+     * Gets the single, empty and immutable EventArgs instance.
+     *
+     * This instance will be used when events are dispatched without any parameter,
+     * like this: EventManager::dispatchEvent('eventname');
+     *
+     * The benefit from this is that only one empty instance is instantiated and shared
+     * (otherwise there would be instances for every dispatched in the abovementioned form).
+     *
+     * @link https://msdn.microsoft.com/en-us/library/system.eventargs.aspx
+     * @see EventManager::dispatchEvent
+     *
+     * @return EventArgs
+     */
+    public static function getEmptyInstance()
+    {
+        if (! self::$_emptyEventArgsInstance) {
+            self::$_emptyEventArgsInstance = new EventArgs();
+        }
+
+        return self::$_emptyEventArgsInstance;
+    }
+}

vendor/doctrine/event-manager/src/EventManager.php

@@ -0,0 +1,156 @@
+<?php
+
+namespace Doctrine\Common;
+
+use Doctrine\Deprecations\Deprecation;
+
+use function spl_object_hash;
+
+/**
+ * The EventManager is the central point of Doctrine's event listener system.
+ * Listeners are registered on the manager and events are dispatched through the
+ * manager.
+ */
+class EventManager
+{
+    /**
+     * Map of registered listeners.
+     * <event> => <listeners>
+     *
+     * @var array<string, object[]>
+     */
+    private $listeners = [];
+
+    /**
+     * Dispatches an event to all registered listeners.
+     *
+     * @param string         $eventName The name of the event to dispatch. The name of the event is
+     *                                  the name of the method that is invoked on listeners.
+     * @param EventArgs|null $eventArgs The event arguments to pass to the event handlers/listeners.
+     *                                  If not supplied, the single empty EventArgs instance is used.
+     *
+     * @return void
+     */
+    public function dispatchEvent($eventName, ?EventArgs $eventArgs = null)
+    {
+        if (! isset($this->listeners[$eventName])) {
+            return;
+        }
+
+        $eventArgs = $eventArgs ?? EventArgs::getEmptyInstance();
+
+        foreach ($this->listeners[$eventName] as $listener) {
+            $listener->$eventName($eventArgs);
+        }
+    }
+
+    /**
+     * Gets the listeners of a specific event.
+     *
+     * @param string|null $event The name of the event.
+     *
+     * @return object[]|array<string, object[]> The event listeners for the specified event, or all event listeners.
+     * @psalm-return ($event is null ? array<string, object[]> : object[])
+     */
+    public function getListeners($event = null)
+    {
+        if ($event === null) {
+            Deprecation::trigger(
+                'doctrine/event-manager',
+                'https://github.com/doctrine/event-manager/pull/50',
+                'Calling %s without an event name is deprecated. Call getAllListeners() instead.',
+                __METHOD__
+            );
+
+            return $this->getAllListeners();
+        }
+
+        return $this->listeners[$event] ?? [];
+    }
+
+    /**
+     * Gets all listeners keyed by event name.
+     *
+     * @return array<string, object[]> The event listeners for the specified event, or all event listeners.
+     */
+    public function getAllListeners(): array
+    {
+        return $this->listeners;
+    }
+
+    /**
+     * Checks whether an event has any registered listeners.
+     *
+     * @param string $event
+     *
+     * @return bool TRUE if the specified event has any listeners, FALSE otherwise.
+     */
+    public function hasListeners($event)
+    {
+        return ! empty($this->listeners[$event]);
+    }
+
+    /**
+     * Adds an event listener that listens on the specified events.
+     *
+     * @param string|string[] $events   The event(s) to listen on.
+     * @param object          $listener The listener object.
+     *
+     * @return void
+     */
+    public function addEventListener($events, $listener)
+    {
+        // Picks the hash code related to that listener
+        $hash = spl_object_hash($listener);
+
+        foreach ((array) $events as $event) {
+            // Overrides listener if a previous one was associated already
+            // Prevents duplicate listeners on same event (same instance only)
+            $this->listeners[$event][$hash] = $listener;
+        }
+    }
+
+    /**
+     * Removes an event listener from the specified events.
+     *
+     * @param string|string[] $events
+     * @param object          $listener
+     *
+     * @return void
+     */
+    public function removeEventListener($events, $listener)
+    {
+        // Picks the hash code related to that listener
+        $hash = spl_object_hash($listener);
+
+        foreach ((array) $events as $event) {
+            unset($this->listeners[$event][$hash]);
+        }
+    }
+
+    /**
+     * Adds an EventSubscriber. The subscriber is asked for all the events it is
+     * interested in and added as a listener for these events.
+     *
+     * @param EventSubscriber $subscriber The subscriber.
+     *
+     * @return void
+     */
+    public function addEventSubscriber(EventSubscriber $subscriber)
+    {
+        $this->addEventListener($subscriber->getSubscribedEvents(), $subscriber);
+    }
+
+    /**
+     * Removes an EventSubscriber. The subscriber is asked for all the events it is
+     * interested in and removed as a listener for these events.
+     *
+     * @param EventSubscriber $subscriber The subscriber.
+     *
+     * @return void
+     */
+    public function removeEventSubscriber(EventSubscriber $subscriber)
+    {
+        $this->removeEventListener($subscriber->getSubscribedEvents(), $subscriber);
+    }
+}

vendor/doctrine/event-manager/src/EventSubscriber.php

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+<?php
+
+declare(strict_types=1);
+
+namespace Doctrine\Common;
+
+/**
+ * An EventSubscriber knows what events it is interested in.
+ * If an EventSubscriber is added to an EventManager, the manager invokes
+ * {@link getSubscribedEvents} and registers the subscriber as a listener for all
+ * returned events.
+ */
+interface EventSubscriber
+{
+    /**
+     * Returns an array of events this subscriber wants to listen to.
+     *
+     * @return string[]
+     */
+    public function getSubscribedEvents();
+}