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[yaffs-website] / vendor / doctrine / common / lib / Doctrine / Common / EventManager.php

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+<?php
+/*
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+ * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+ * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+ * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+ * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+ * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+ * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+ * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+ * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+ * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+ * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ *
+ * This software consists of voluntary contributions made by many individuals
+ * and is licensed under the MIT license. For more information, see
+ * <http://www.doctrine-project.org>.
+ */
+
+namespace Doctrine\Common;
+
+/**
+ * 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.
+ *
+ * @link   www.doctrine-project.org
+ * @since  2.0
+ * @author Guilherme Blanco <guilhermeblanco@hotmail.com>
+ * @author Jonathan Wage <jonwage@gmail.com>
+ * @author Roman Borschel <roman@code-factory.org>
+ */
+class EventManager
+{
+    /**
+     * Map of registered listeners.
+     * <event> => <listeners>
+     *
+     * @var array
+     */
+    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 $eventArgs The event arguments to pass to the event handlers/listeners.
+     *                                  If not supplied, the single empty EventArgs instance is used.
+     *
+     * @return boolean
+     */
+    public function dispatchEvent($eventName, EventArgs $eventArgs = null)
+    {
+        if (isset($this->_listeners[$eventName])) {
+            $eventArgs = $eventArgs === null ? EventArgs::getEmptyInstance() : $eventArgs;
+
+            foreach ($this->_listeners[$eventName] as $listener) {
+                $listener->$eventName($eventArgs);
+            }
+        }
+    }
+
+    /**
+     * Gets the listeners of a specific event or all listeners.
+     *
+     * @param string|null $event The name of the event.
+     *
+     * @return array The event listeners for the specified event, or all event listeners.
+     */
+    public function getListeners($event = null)
+    {
+        return $event ? $this->_listeners[$event] : $this->_listeners;
+    }
+
+    /**
+     * Checks whether an event has any registered listeners.
+     *
+     * @param string $event
+     *
+     * @return boolean TRUE if the specified event has any listeners, FALSE otherwise.
+     */
+    public function hasListeners($event)
+    {
+        return isset($this->_listeners[$event]) && $this->_listeners[$event];
+    }
+
+    /**
+     * Adds an event listener that listens on the specified events.
+     *
+     * @param string|array $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|array $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 $event) {
+            // Check if actually have this listener associated
+            if (isset($this->_listeners[$event][$hash])) {
+                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 \Doctrine\Common\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 \Doctrine\Common\EventSubscriber $subscriber The subscriber.
+     *
+     * @return void
+     */
+    public function removeEventSubscriber(EventSubscriber $subscriber)
+    {
+        $this->removeEventListener($subscriber->getSubscribedEvents(), $subscriber);
+    }
+}