108      * @param VCalendar $existingObject
112     function processMessage(Message $itipMessage, VCalendar $existingObject = null) {  argument
122                 return $this->processMessageRequest($itipMessage, $existingObject);
125                 return $this->processMessageCancel($itipMessage, $existingObject);
128                 return $this->processMessageReply($itipMessage, $existingObject);
136         return $existingObject;
275      * @param VCalendar $existingObject
279 … protected function processMessageRequest(Message $itipMessage, VCalendar $existingObject = null) {  argument
281         if (!$existingObject) {
284             $existingObject = new VCalendar();
286                 $existingObject->add(clone $component);
292             foreach ($existingObject->getComponents() as $component) {
293                 $existingObject->remove($component);
296                 $existingObject->add(clone $component);
299         return $existingObject;
311      * @param VCalendar $existingObject
315 …  protected function processMessageCancel(Message $itipMessage, VCalendar $existingObject = null) {  argument
317         if (!$existingObject) {
321             foreach ($existingObject->VEVENT as $vevent) {
326         return $existingObject;
337      * @param VCalendar $existingObject
341     protected function processMessageReply(Message $itipMessage, VCalendar $existingObject = null) {  argument
345         if (!$existingObject) {
365         foreach ($existingObject->VEVENT as $vevent) {
405             $recurrenceIterator = new EventIterator($existingObject, $itipMessage->uid);
447             $existingObject->add($newObject);
450         return $existingObject;