/**
  * Executes special page
  */
 public function execute($par)
 {
     global $wgRequest;
     $wgFarmer = MediaWikiFarmer::getInstance();
     $this->setHeaders();
     $request = $par !== null ? $par : $wgRequest->getText('request');
     $arr = explode('/', $request);
     if (count($arr) && $arr[0]) {
         if ($arr[0] == 'create') {
             $this->_executeCreate($wgFarmer, isset($arr[1]) ? $arr[1] : null);
         } elseif ($arr[0] == 'manageExtensions') {
             $this->_executeManageExtensions($wgFarmer);
         } elseif ($arr[0] == 'updateList') {
             $this->_executeUpdateList($wgFarmer);
         } elseif ($arr[0] == 'list') {
             $this->_executeList($wgFarmer);
         } elseif ($arr[0] == 'admin') {
             $this->_executeAdminister($wgFarmer);
         } elseif ($arr[0] == 'delete') {
             $this->_executeDelete($wgFarmer);
         }
     } else {
         // no parameters were given
         // display the main page
         $this->_executeMainPage($wgFarmer);
     }
 }
 protected function _deleteWikiGroups()
 {
     if (MediaWikiFarmer::getInstance()->sharingGroups()) {
         $db = $this->getDatabase();
         $query = 'DELETE FROM ' . $db->tableName('user_groups') . ' WHERE ug_group LIKE ';
         $query .= '\'[farmer][' . $this->_name . ']%\'';
         $db->query($query, __METHOD__);
     }
 }