1 files changed, 103 insertions, 0 deletions
diff --git a/www/wiki/extensions/SemanticMediaWiki/src/EventHandler.php b/www/wiki/extensions/SemanticMediaWiki/src/EventHandler.php
new file mode 100644
index 00000000..b0bdfa55
--- /dev/null
+++ b/www/wiki/extensions/SemanticMediaWiki/src/EventHandler.php
@@ -0,0 +1,103 @@
+<?php
+
+namespace SMW;
+
+use Onoi\EventDispatcher\EventDispatcher;
+use Onoi\EventDispatcher\EventDispatcherFactory;
+
+/**
+ * @license GNU GPL v2+
+ * @since 2.2
+ *
+ * @author mwjames
+ */
+class EventHandler {
+
+	/**
+	 * @var EventHandler
+	 */
+	private static $instance = null;
+
+	/**
+	 * @var EventDispatcher
+	 */
+	private $eventDispatcher = null;
+
+	/**
+	 * @since 2.2
+	 *
+	 * @param EventDispatcher $eventDispatcher
+	 */
+	public function __construct( EventDispatcher $eventDispatcher ) {
+		$this->eventDispatcher = $eventDispatcher;
+	}
+
+	/**
+	 * @since 2.2
+	 *
+	 * @return self
+	 */
+	public static function getInstance() {
+
+		if ( self::$instance === null ) {
+			self::$instance = new self( self::newEventDispatcher() );
+		}
+
+		return self::$instance;
+	}
+
+	/**
+	 * @since 2.2
+	 */
+	public static function clear() {
+		self::$instance = null;
+	}
+
+	/**
+	 * @since 2.2
+	 *
+	 * @return EventDispatcher
+	 */
+	public function getEventDispatcher() {
+		return $this->eventDispatcher;
+	}
+
+	/**
+	 * @since 2.2
+	 *
+	 * @return DispatchContext
+	 */
+	public function newDispatchContext() {
+		return EventDispatcherFactory::getInstance()->newDispatchContext();
+	}
+
+	/**
+	 * @since 2.3
+	 *
+	 * @param string $event
+	 * @param Closure $callback
+	 */
+	public function addCallbackListener( $event, \Closure $callback ) {
+
+		$listener = EventDispatcherFactory::getInstance()->newGenericCallbackEventListener();
+		$listener->registerCallback( $callback );
+
+		$this->getEventDispatcher()->addListener(
+			$event,
+			$listener
+		);
+	}
+
+	private static function newEventDispatcher() {
+
+		$eventListenerRegistry = new EventListenerRegistry(
+			EventDispatcherFactory::getInstance()->newGenericEventListenerCollection()
+		);
+
+		$eventDispatcher = EventDispatcherFactory::getInstance()->newGenericEventDispatcher();
+		$eventDispatcher->addListenerCollection( $eventListenerRegistry );
+
+		return $eventDispatcher;
+	}
+
+}