Mercurial > dive4elements > river
changeset 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 | 1b1af1597401 |
| children | 9e0500d64524 |
| files | flys-artifacts/ChangeLog flys-artifacts/src/main/java/de/intevation/flys/utils/DateAverager.java |
| diffstat | 2 files changed, 42 insertions(+), 1 deletions(-) [+] |
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--- a/flys-artifacts/ChangeLog Wed May 30 15:38:23 2012 +0000 +++ b/flys-artifacts/ChangeLog Wed May 30 17:01:54 2012 +0000 @@ -1,7 +1,12 @@ +2012-05-30 Sascha L. Teichmann <sascha.teichmann@intevation.de> + + * src/main/java/de/intevation/flys/utils/DateAverager.java: + New. Averages a list of dates preventing overflows. + 2012-05-30 Sascha L. Teichmann <sascha.teichmann@intevation.de> * src/main/java/de/intevation/flys/artifacts/model/FixingsOverview.java: - Added a km filter to find columns with touches a given km. + Added a km filter to find columns which touches a given km. * src/main/java/de/intevation/flys/artifacts/model/FixingsFilterBuilder.java: Expose the new km filter to the fixing overview service. Syntax:
--- /dev/null Thu Jan 01 00:00:00 1970 +0000 +++ b/flys-artifacts/src/main/java/de/intevation/flys/utils/DateAverager.java Wed May 30 17:01:54 2012 +0000 @@ -0,0 +1,36 @@ +package de.intevation.flys.utils; + +import gnu.trove.TLongArrayList; + +import java.util.Date; + +public class DateAverager +{ + protected TLongArrayList dates; + + public DateAverager() { + dates = new TLongArrayList(); + } + + public void add(Date date) { + dates.add(date.getTime()); + } + + public Date getAverage() { + int N = dates.size(); + if (N == 0) { + return null; + } + long min = dates.min(); + long sum = 0L; + for (int i = 0; i < N; ++i) { + sum += dates.getQuick(i) - min; + } + return new Date(min + (long)Math.round(sum/(double)N)); + } + + public void clear() { + dates.resetQuick(); + } +} +// vim:set ts=4 sw=4 si et sta sts=4 fenc=utf8 :