@Override
    public Iterator<Long> iterator() {
        final int size = this.getWindowRangeCount();
        final long increment = getWindowSlotSize();
        return new TimeSeriesIterator(size, from, increment);
    }
@throws ArithmeticException if the {@code count} overflows an int
commons-timeseries/src/main/java/com/navercorp/pinpoint/common/timeseries/window/TimeWindow.java