Mercurial > dive4elements > river
annotate artifacts/src/main/java/org/dive4elements/river/utils/DateAverager.java @ 6955:94cb1845c667
(issue1452) Coalesce to zero to avoid NaN arithmetic.
author | Andre Heinecke <aheinecke@intevation.de> |
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date | Fri, 30 Aug 2013 15:45:14 +0200 |
parents | af13ceeba52a |
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River artifacts: Added new copyright headers.
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1 /* Copyright (C) 2011, 2012, 2013 by Bundesanstalt für Gewässerkunde |
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2 * Software engineering by Intevation GmbH |
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3 * |
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4 * This file is Free Software under the GNU AGPL (>=v3) |
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5 * and comes with ABSOLUTELY NO WARRANTY! Check out the |
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6 * documentation coming with Dive4Elements River for details. |
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7 */ |
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8 |
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9 package org.dive4elements.river.utils; |
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10 |
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11 import gnu.trove.TLongArrayList; |
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12 |
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13 import java.util.Date; |
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14 |
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15 public class DateAverager |
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16 { |
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17 protected TLongArrayList dates; |
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18 |
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19 public DateAverager() { |
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20 dates = new TLongArrayList(); |
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21 } |
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22 |
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23 public void add(Date date) { |
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24 dates.add(date.getTime()); |
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25 } |
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26 |
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27 public Date getAverage() { |
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28 int N = dates.size(); |
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29 if (N == 0) { |
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30 return null; |
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31 } |
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32 long min = dates.min(); |
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33 long sum = 0L; |
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34 for (int i = 0; i < N; ++i) { |
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35 sum += dates.getQuick(i) - min; |
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36 } |
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37 return new Date(min + (long)Math.round(sum/(double)N)); |
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38 } |
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39 |
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40 public void clear() { |
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41 dates.resetQuick(); |
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42 } |
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43 } |
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44 // vim:set ts=4 sw=4 si et sta sts=4 fenc=utf8 : |