CalDAV/Google Calendar - Java Class Interface

Require a simple java class that interfaces to _any_calDav_ compatible calendar, but specifically compatible with _Google_Calendar_. Simple interface required only. Just demonstrate that the interface works via a jsp page, where I can enter in the credentials, and then see a text dump of the data as per the structures below. Something like class Calendar { String calendarName;// plus any other general data that comes back for a given calendar from google Calendar getInstance(CalDAVCredentials?) { // get a calendar Instance for given CalDAV credentials... Feel free to expand on what is required. } boolean addEvent(Event); //true if success, Event getEvent(EventID); //return the event as below boolean deleteEvent(EventID); //true if success, boolean saveEventChanges(Event); // eg save date/time change or description changes direct to google Iterator getEvents(date start, date finish) // retrieve Event data from google calendar for the period indicated, including repeat events } class Event { String googleEventID; date eventStartDateTime; date eventFinishDateTime; date lastModifiedTime; //last time that this was modified in google, needed for syncing XXX duration; String frequency; //eg daily, weekly, monthly String eventTitle; String eventDetails //plus other common event data }