public EventsFirstLastCountTuple getEventsFirstLastCount() { EventsFirstLastCountTuple ret = new EventsFirstLastCountTuple(); ret.count = _events.size(); Date first = new Date(); Date last = new Date(0); for (ProcessInstanceEvent event : _events) { if (event.getTimestamp().before(first)) first = event.getTimestamp(); if (event.getTimestamp().after(last)) last = event.getTimestamp(); } ret.first = first; ret.last = last; return ret; }