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

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+<?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;
+    }
+}