Mercurial > dive4elements > river

annotate flys-artifacts/src/main/java/de/intevation/flys/utils/DateAverager.java @ 4031:e4e345d81a65

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issue889/2
author Felix Wolfsteller <felix.wolfsteller@intevation.de>
date Thu, 04 Oct 2012 14:54:44 +0200
parents d520a0869972
children
rev   line source
3007
d520a0869972 Added class to average dates without overflows.
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents:
diff changeset
1 package de.intevation.flys.utils;
d520a0869972 Added class to average dates without overflows.
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents:
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2
d520a0869972 Added class to average dates without overflows.
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents:
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3 import gnu.trove.TLongArrayList;
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Sascha L. Teichmann <sascha.teichmann@intevation.de>
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4
d520a0869972 Added class to average dates without overflows.
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents:
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5 import java.util.Date;
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Sascha L. Teichmann <sascha.teichmann@intevation.de>
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6
d520a0869972 Added class to average dates without overflows.
Sascha L. Teichmann <sascha.teichmann@intevation.de>
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7 public class DateAverager
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Sascha L. Teichmann <sascha.teichmann@intevation.de>
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8 {
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Sascha L. Teichmann <sascha.teichmann@intevation.de>
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9 protected TLongArrayList dates;
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Sascha L. Teichmann <sascha.teichmann@intevation.de>
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10
d520a0869972 Added class to average dates without overflows.
Sascha L. Teichmann <sascha.teichmann@intevation.de>
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11 public DateAverager() {
d520a0869972 Added class to average dates without overflows.
Sascha L. Teichmann <sascha.teichmann@intevation.de>
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12 dates = new TLongArrayList();
d520a0869972 Added class to average dates without overflows.
Sascha L. Teichmann <sascha.teichmann@intevation.de>
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13 }
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Sascha L. Teichmann <sascha.teichmann@intevation.de>
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14
d520a0869972 Added class to average dates without overflows.
Sascha L. Teichmann <sascha.teichmann@intevation.de>
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15 public void add(Date date) {
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Sascha L. Teichmann <sascha.teichmann@intevation.de>
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16 dates.add(date.getTime());
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Sascha L. Teichmann <sascha.teichmann@intevation.de>
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17 }
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18
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Sascha L. Teichmann <sascha.teichmann@intevation.de>
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19 public Date getAverage() {
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Sascha L. Teichmann <sascha.teichmann@intevation.de>
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20 int N = dates.size();
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Sascha L. Teichmann <sascha.teichmann@intevation.de>
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21 if (N == 0) {
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Sascha L. Teichmann <sascha.teichmann@intevation.de>
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22 return null;
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Sascha L. Teichmann <sascha.teichmann@intevation.de>
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23 }
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Sascha L. Teichmann <sascha.teichmann@intevation.de>
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24 long min = dates.min();
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Sascha L. Teichmann <sascha.teichmann@intevation.de>
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25 long sum = 0L;
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26 for (int i = 0; i < N; ++i) {
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27 sum += dates.getQuick(i) - min;
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Sascha L. Teichmann <sascha.teichmann@intevation.de>
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28 }
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Sascha L. Teichmann <sascha.teichmann@intevation.de>
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29 return new Date(min + (long)Math.round(sum/(double)N));
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Sascha L. Teichmann <sascha.teichmann@intevation.de>
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30 }
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Sascha L. Teichmann <sascha.teichmann@intevation.de>
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31
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Sascha L. Teichmann <sascha.teichmann@intevation.de>
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32 public void clear() {
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Sascha L. Teichmann <sascha.teichmann@intevation.de>
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33 dates.resetQuick();
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Sascha L. Teichmann <sascha.teichmann@intevation.de>
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34 }
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Sascha L. Teichmann <sascha.teichmann@intevation.de>
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35 }
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Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents:
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36 // vim:set ts=4 sw=4 si et sta sts=4 fenc=utf8 :
http://dive4elements.wald.intevation.org