108      * @param VCalendar $existingObject
111     public function processMessage(Message $itipMessage, VCalendar $existingObject = null) {  argument
121                 return $this->processMessageRequest($itipMessage, $existingObject);
124                 return $this->processMessageCancel($itipMessage, $existingObject);
127                 return $this->processMessageReply($itipMessage, $existingObject);
135         return $existingObject;
273      * @param VCalendar $existingObject
276 … protected function processMessageRequest(Message $itipMessage, VCalendar $existingObject = null) {  argument
278         if (!$existingObject) {
281             $existingObject = new VCalendar();
283                 $existingObject->add(clone $component);
289             foreach($existingObject->getComponents() as $component) {
290                 $existingObject->remove($component);
293                 $existingObject->add(clone $component);
296         return $existingObject;
308      * @param VCalendar $existingObject
311 …  protected function processMessageCancel(Message $itipMessage, VCalendar $existingObject = null) {  argument
313         if (!$existingObject) {
317             foreach($existingObject->VEVENT as $vevent) {
322         return $existingObject;
333      * @param VCalendar $existingObject
336     protected function processMessageReply(Message $itipMessage, VCalendar $existingObject = null) {  argument
340         if (!$existingObject) {
360         foreach($existingObject->VEVENT as $vevent) {
400             $recurrenceIterator = new EventIterator($existingObject, $itipMessage->uid);
442             $existingObject->add($newObject);
445         return $existingObject;