Mercurial > dive4elements > river
comparison flys-artifacts/src/main/java/de/intevation/flys/utils/DateAverager.java @ 3007:d520a0869972
Added class to average dates without overflows.
flys-artifacts/trunk@4563 c6561f87-3c4e-4783-a992-168aeb5c3f6f
| author | Sascha L. Teichmann <sascha.teichmann@intevation.de> |
|---|---|
| date | Wed, 30 May 2012 17:01:54 +0000 |
| parents | |
| children |
comparison
equal
deleted
inserted
replaced
| 3006:1b1af1597401 | 3007:d520a0869972 |
|---|---|
| 1 package de.intevation.flys.utils; | |
| 2 | |
| 3 import gnu.trove.TLongArrayList; | |
| 4 | |
| 5 import java.util.Date; | |
| 6 | |
| 7 public class DateAverager | |
| 8 { | |
| 9 protected TLongArrayList dates; | |
| 10 | |
| 11 public DateAverager() { | |
| 12 dates = new TLongArrayList(); | |
| 13 } | |
| 14 | |
| 15 public void add(Date date) { | |
| 16 dates.add(date.getTime()); | |
| 17 } | |
| 18 | |
| 19 public Date getAverage() { | |
| 20 int N = dates.size(); | |
| 21 if (N == 0) { | |
| 22 return null; | |
| 23 } | |
| 24 long min = dates.min(); | |
| 25 long sum = 0L; | |
| 26 for (int i = 0; i < N; ++i) { | |
| 27 sum += dates.getQuick(i) - min; | |
| 28 } | |
| 29 return new Date(min + (long)Math.round(sum/(double)N)); | |
| 30 } | |
| 31 | |
| 32 public void clear() { | |
| 33 dates.resetQuick(); | |
| 34 } | |
| 35 } | |
| 36 // vim:set ts=4 sw=4 si et sta sts=4 fenc=utf8 : |