protected function _addEventAttendee(Sabre_VObject_Component $_vevent, Calendar_Model_Event $_event)
 {
     if (version_compare($this->_version, '1.0b2', '>')) {
         parent::_addEventAttendee($_vevent, $_event);
     } else {
         // special handling for Lightning <= 1.0b2
         // attendees get screwed up, if the CN contains commas
         Calendar_Model_Attender::resolveAttendee($_event->attendee, FALSE, $_event);
         foreach ($_event->attendee as $eventAttendee) {
             $attendeeEmail = $eventAttendee->getEmail();
             if ($attendeeEmail) {
                 $attendee = new Sabre_VObject_Property('ATTENDEE', (strpos($attendeeEmail, '@') !== false ? 'mailto:' : 'urn:uuid:') . $attendeeEmail);
                 $attendee->add('CN', str_replace(',', null, $eventAttendee->getName()));
                 $attendee->add('CUTYPE', Calendar_Convert_Event_VCalendar_Abstract::$cutypeMap[$eventAttendee->user_type]);
                 $attendee->add('PARTSTAT', $eventAttendee->status);
                 $attendee->add('ROLE', "{$eventAttendee->role}-PARTICIPANT");
                 $attendee->add('RSVP', 'FALSE');
                 if (strpos($attendeeEmail, '@') !== false) {
                     $attendee->add('EMAIL', $attendeeEmail);
                 }
                 $_vevent->add($attendee);
             }
         }
     }
 }
 /**
  * Updates the VCard-formatted object
  *
  * @param string $cardData
  * @return void
  */
 public function put($cardData)
 {
     if (get_class($this->_converter) == 'Tasks_Convert_Task_VCalendar_Generic') {
         if (Tinebase_Core::isLogLevel(Zend_Log::WARN)) {
             Tinebase_Core::getLogger()->warn(__METHOD__ . '::' . __LINE__ . " update by generic client not allowed. See Tasks_Convert_Task_VCalendar_Factory for supported clients.");
         }
         throw new Sabre\DAV\Exception\Forbidden('Update denied for unknow client');
     }
     if (is_resource($cardData)) {
         $cardData = stream_get_contents($cardData);
     }
     // Converting to UTF-8, if needed
     $cardData = Sabre\DAV\StringUtil::ensureUTF8($cardData);
     #Sabre_CalDAV_ICalendarUtil::validateICalendarObject($cardData, array('VTODO', 'VFREEBUSY'));
     $vobject = Tasks_Convert_Task_VCalendar_Abstract::getVObject($cardData);
     foreach ($vobject->children() as $component) {
         if (isset($component->{'X-TINE20-CONTAINER'})) {
             $xContainerId = $component->{'X-TINE20-CONTAINER'};
             break;
         }
     }
     // keep old record for reference
     $recordBeforeUpdate = clone $this->getRecord();
     $task = $this->_converter->toTine20Model($vobject, $this->getRecord(), array(Tasks_Convert_Task_VCalendar_Abstract::OPTION_USE_SERVER_MODLOG => true));
     // iCal does sends back an old value, because it does not refresh the vcalendar after
     // update. Therefor we must reapply the value of last_modified_time after the convert
     $task->last_modified_time = $recordBeforeUpdate->last_modified_time;
     $currentContainer = Tinebase_Container::getInstance()->getContainerById($this->getRecord()->container_id);
     //$ownAttendee = Calendar_Model_Attender::getOwnAttender($this->getRecord()->attendee);
     // task 'belongs' current user -> allow container move
     if ($currentContainer->isPersonalOf(Tinebase_Core::getUser())) {
         $task->container_id = $this->_container->getId();
     }
     // client sends CalDAV task -> handle a container move
     /*else if (isset($xContainerId)) {
           if ($xContainerId == $currentContainer->getId()) {
               $task->container_id = $this->_container->getId();
           } else {
               // @TODO allow organizer to move original cal when he edits the displaycal task?
               if ($ownAttendee && $this->_container->type == Tinebase_Model_Container::TYPE_PERSONAL) {
                   $ownAttendee->displaycontainer_id = $this->_container->getId();
               }
           }
       }
       */
     // client sends task from iMIP invitation -> only allow displaycontainer move
     /*else {
           if (Tinebase_Core::isLogLevel(Zend_Log::DEBUG))
               Tinebase_Core::getLogger()->debug(__METHOD__ . '::' . __LINE__ . " X-TINE20-CONTAINER not present -> restrict container moves");
           if ($ownAttendee && $this->_container->type == Tinebase_Model_Container::TYPE_PERSONAL) {
               if ($ownAttendee->displaycontainer_id == $currentContainer->getId()) {
                   $task->container_id = $this->_container->getId();
               }
               
               $ownAttendee->displaycontainer_id = $this->_container->getId();
           }
       }*/
     self::enforceEventParameters($task);
     // don't allow update of alarms for non organizer if oganizer is Tine 2.0 user
     if ($task->organizer !== Tinebase_Core::getUser()->getId()) {
         $organizerContact = Addressbook_Controller_Contact::getInstance()->getContactByUserId($task->organizer, TRUE);
         // reset alarms if organizer is Tine 2.0 user
         if (!empty($organizerContact->account_id)) {
             $this->_resetAlarms($task, $recordBeforeUpdate);
         }
     }
     if (Tinebase_Core::isLogLevel(Zend_Log::DEBUG)) {
         Tinebase_Core::getLogger()->debug(__METHOD__ . '::' . __LINE__ . " " . print_r($task->toArray(), true));
     }
     try {
         $this->_task = Tasks_Controller_Task::getInstance()->update($task);
     } catch (Tinebase_Timemachine_Exception_ConcurrencyConflict $ttecc) {
         throw new Sabre\DAV\Exception\PreconditionFailed('An If-Match header was specified, but none of the specified the ETags matched.', 'If-Match');
     } catch (Tinebase_Exception_AccessDenied $tead) {
         throw new Sabre\DAV\Exception\Forbidden('forbidden update');
     } catch (Tinebase_Exception_NotFound $tenf) {
         throw new Sabre\DAV\Exception\PreconditionFailed('not found');
     } catch (Exception $e) {
         Tinebase_Core::getLogger()->err(__METHOD__ . '::' . __LINE__ . " " . $e);
         Tinebase_Core::getLogger()->err(__METHOD__ . '::' . __LINE__ . " " . $cardData);
         Tinebase_Core::getLogger()->err(__METHOD__ . '::' . __LINE__ . " " . print_r($task->toArray(), true));
         throw new Sabre\DAV\Exception\PreconditionFailed($e->getMessage());
     }
     return $this->getETag();
 }