Initial version of ManagedAction

This will simplify actions for future development and maintenance
since we can automate much more (such as auto-running show[Ajax|Page])
and handle errors of various kinds. Essentially the same kind of
improvements as Managed_DataObject gives us.

lib/managedaction.php

@@ -0,0 +1,61 @@
+<?php
+/**
+ * StatusNet, the distributed open-source microblogging tool
+ *
+ * Base class for all actions with automatic showPage() call in handle()
+ *
+ * PHP version 5
+ *
+ * LICENCE: This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU Affero General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * 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
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ *
+ * @category  Action
+ * @package   StatusNet
+ * @author    Evan Prodromou <evan@status.net>
+ * @author    Sarven Capadisli <csarven@status.net>
+ * @copyright 2008 StatusNet, Inc.
+ * @license   http://www.fsf.org/licensing/licenses/agpl-3.0.html GNU Affero General Public License version 3.0
+ * @link      http://status.net/
+ */
+
+if (!defined('GNUSOCIAL')) { exit(1); }
+
+class ManagedAction extends Action
+{
+    /**
+     * Handler method
+     */
+    protected function handle()
+    {
+        parent::handle();
+
+        if (StatusNet::isAjax()) {
+            $this->showAjax();
+        } else {
+            $this->showPage();
+        }
+    }
+
+    public function showAjax()
+    {
+        $this->startHTML('text/xml;charset=utf-8');
+        $this->elementStart('head');
+        // TRANS: Title for conversation page.
+        $this->element('title', null, _m('TITLE','Notice'));
+        $this->elementEnd('head');
+        $this->elementStart('body');
+        $this->showContent();
+        $this->elementEnd('body');
+        $this->endHTML();
+    }
+}