private int findInterval(long timestamp) {
public int findInterval(long timestamp) {
	private int findInterval(long timestamp) {		int min = 0;		int max = intervalList.size();				while (min <= max) {			int mid = min + (max-min)/2;			TimestampInterval interval = intervalList.get(mid);			if (interval.contains(timestamp)) {				return mid;			}			if (mid < interval.getBegin()) {				max = mid - 1;			} else {				min = mid + 1;			}		}				return -1;	}