Mercurial > dive4elements > river

annotate artifacts/src/main/java/org/dive4elements/river/artifacts/model/sq/LogSQ.java @ 8539:84929f882fa2

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(issue1753) Carry measurement date through SQ values
author Andre Heinecke <andre.heinecke@intevation.de>
date Fri, 13 Feb 2015 12:34:06 +0100
parents 1c3b2f7dc9a4
children
rev   line source
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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.artifacts.model.sq;
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10
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11 import java.util.Date;
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12
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13 public class LogSQ extends SQ {
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14
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15 public static final View LOG_SQ_VIEW = new View() {
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16 @Override
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17 public double getS(SQ sq) {
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18 return ((LogSQ)sq).getLogS();
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19 }
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20
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21 @Override
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22 public double getQ(SQ sq) {
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23 return ((LogSQ)sq).getLogQ();
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24 }
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25
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26 @Override
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27 public Date getDate(SQ sq) {
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28 return sq.getDate();
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29 }
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30 };
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31
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32 public static final Factory LOG_SQ_FACTORY = new Factory() {
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33 @Override
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34 public SQ createSQ(double s, double q, Date d) {
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35 return new LogSQ(s, q, d);
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36 }
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37 };
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38
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39 protected double logS;
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40 protected double logQ;
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41
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42 protected boolean logTrans;
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43
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44 public LogSQ() {
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45 }
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46
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47 public LogSQ(double s, double q, Date d) {
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48 super(s, q, d);
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49 }
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50
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51 /** important: We cannot process negative s/q. */
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52 @Override
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53 public boolean isValid() {
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54 return super.isValid() && s > 0d && q > 0d;
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55 }
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56
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57 protected void ensureLogTrans() {
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58 if (!logTrans) {
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59 logTrans = true;
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60 logS = Math.log(s);
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61 logQ = Math.log(q);
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62 }
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63 }
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64
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65 public double getLogS() {
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66 ensureLogTrans();
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67 return logS;
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68 }
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69
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70 public double getLogQ() {
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71 ensureLogTrans();
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72 return logQ;
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73 }
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74 }
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75
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