Merge "Don't create unnecessary objects."

                return;

            }

            final LinkedList<Event> events = mReportedEvents.get(userId, new LinkedList<>());

            events.add(event);

            if (mReportedEvents.get(userId) == null) {

            LinkedList<Event> events = mReportedEvents.get(userId);

            if (events == null) {

                events = new LinkedList<>();

                mReportedEvents.put(userId, events);

            }

            events.add(event);

            if (events.size() == 1) {

                // Every time a file is persisted to disk, mReportedEvents is cleared for this user

                // so trigger a flush to disk every time the first event has been added.