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> |
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date | Wed, 30 May 2012 17:01:54 +0000 |
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3006:1b1af1597401 | 3007:d520a0869972 |
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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 : |