Mercurial > dive4elements > river

annotate artifacts/src/main/java/org/dive4elements/river/artifacts/model/sq/LogSQ.java @ 6821:1c3b2f7dc9a4

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S/Q relation: Added forgotten class.
author Sascha L. Teichmann <teichmann@intevation.de>
date Wed, 14 Aug 2013 11:01:16 +0200
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children 84929f882fa2
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6821
1c3b2f7dc9a4 S/Q relation: Added forgotten class.
Sascha L. Teichmann <teichmann@intevation.de>
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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 public class LogSQ extends SQ {
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12
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13 public static final View LOG_SQ_VIEW = new View() {
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14 @Override
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15 public double getS(SQ sq) {
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16 return ((LogSQ)sq).getLogS();
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17 }
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18
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19 @Override
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20 public double getQ(SQ sq) {
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21 return ((LogSQ)sq).getLogQ();
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22 }
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23 };
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24
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25 public static final Factory LOG_SQ_FACTORY = new Factory() {
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26 @Override
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27 public SQ createSQ(double s, double q) {
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28 return new LogSQ(s, q);
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29 }
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30 };
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31
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32 protected double logS;
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33 protected double logQ;
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34
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35 protected boolean logTrans;
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36
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37 public LogSQ() {
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38 }
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39
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40 public LogSQ(double s, double q) {
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41 super(s, q);
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42 }
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43
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44 /** important: We cannot process negative s/q. */
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45 @Override
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46 public boolean isValid() {
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47 return super.isValid() && s > 0d && q > 0d;
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48 }
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49
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50 protected void ensureLogTrans() {
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51 if (!logTrans) {
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52 logTrans = true;
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53 logS = Math.log(s);
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54 logQ = Math.log(q);
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55 }
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56 }
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57
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58 public double getLogS() {
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59 ensureLogTrans();
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60 return logS;
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61 }
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62
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63 public double getLogQ() {
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64 ensureLogTrans();
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65 return logQ;
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66 }
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67 }
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68
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