/**
  * (non-PHPdoc)
  * @see class/Ethna_Controller#_getActionName_Form()
  */
 function _getActionName_Form()
 {
     if (isset($_SERVER['REQUEST_METHOD']) == false) {
         return null;
     }
     if (strcasecmp($_SERVER['REQUEST_METHOD'], 'post') == 0) {
         $http_vars =& $_POST;
     } else {
         $http_vars =& $_GET;
     }
     foreach ($http_vars as $name => $value) {
         if ($value == "" || strncmp($name, 'action_', 7) != 0) {
             continue;
         }
         // オリジナル方式 http://hostname/?action_action_name
         return parent::_getActionName_Form();
     }
     // かっこいい http://hostname/action/name/ 方式
     if (!empty($_SERVER['REDIRECT_URL'])) {
         $redirect_url = $_SERVER['REDIRECT_URL'];
         $action_name = str_replace('/', '_', $redirect_url);
         return trim($action_name, '_');
     }
     // まあ悪くはない http://hostname/?action=action_name 方式
     if (array_key_exists('action', $http_vars)) {
         return $http_vars['action'];
     }
 }