Add a public interface for the language factory so apps can use it

lib/private/l10n/factory.php

@@ -25,29 +25,35 @@
 
 namespace OC\L10N;
 
+use OCP\L10N\IFactory;
+
 /**
- * TODO: Description
+ * A factory that generates language instances
  */
-class Factory {
+class Factory implements IFactory {
 	/**
 	 * cached instances
 	 */
 	protected $instances = array();
 
 	/**
-	 * get an L10N instance
+	 * Get a language instance
 	 *
 	 * @param string $app
 	 * @param string|null $lang
-	 * @return \OC_L10N
+	 * @return \OCP\IL10N
 	 */
 	public function get($app, $lang = null) {
-		if (!is_null($lang)) {
-			return new \OC_L10N($app, $lang);
-		} else if (!isset($this->instances[$app])) {
-			$this->instances[$app] = new \OC_L10N($app);
+		$key = $lang;
+		if ($key === null) {
+			$key = 'null';
 		}
-		return $this->instances[$app];
+
+		if (!isset($this->instances[$key][$app])) {
+			$this->instances[$key][$app] = new \OC_L10N($app, $lang);
+		}
+
+		return $this->instances[$key][$app];
 	}
 
 }

lib/private/server.php

@@ -673,6 +673,13 @@ class Server extends SimpleContainer implements IServerContainer {
 		return $this->query('AppConfig');
 	}
 
+	/**
+	 * @return \OCP\L10N\IFactory
+	 */
+	public function getL10NFactory() {
+		return $this->query('L10NFactory');
+	}
+
 	/**
 	 * get an L10N instance
 	 *
@@ -681,7 +688,7 @@ class Server extends SimpleContainer implements IServerContainer {
 	 * @return \OC_L10N
 	 */
 	public function getL10N($app, $lang = null) {
-		return $this->query('L10NFactory')->get($app, $lang);
+		return $this->getL10NFactory()->get($app, $lang);
 	}
 
 	/**

lib/public/l10n/ifactory.php

@@ -0,0 +1,32 @@
+<?php
+/**
+ * @author Joas Schilling <nickvergessen@owncloud.com>
+ *
+ * @copyright Copyright (c) 2015, ownCloud, Inc.
+ * @license AGPL-3.0
+ *
+ * This code is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU Affero General Public License, version 3,
+ * as published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU Affero General Public License for more details.
+ *
+ * You should have received a copy of the GNU Affero General Public License, version 3,
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>
+ *
+ */
+namespace OCP\L10N;
+
+interface IFactory {
+	/**
+	 * Get a language instance
+	 *
+	 * @param string $app
+	 * @param string|null $lang
+	 * @return \OCP\IL10N
+	 */
+	public function get($app, $lang = null);
+}