Mercurial > dive4elements > river

annotate flys-artifacts/src/main/java/de/intevation/flys/artifacts/model/extreme/Curve.java @ 3733:893b2477208f

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Some first models needed for the extreme waterlevels. flys-artifacts/trunk@5406 c6561f87-3c4e-4783-a992-168aeb5c3f6f
author Sascha L. Teichmann <sascha.teichmann@intevation.de>
date Sat, 08 Sep 2012 18:19:33 +0000
parents
children 976be312a84c
rev   line source
3733
893b2477208f Some first models needed for the extreme waterlevels.
Sascha L. Teichmann <sascha.teichmann@intevation.de>
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1 package de.intevation.flys.artifacts.model.extreme;
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2
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3 import de.intevation.flys.artifacts.math.Function;
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4 import de.intevation.flys.artifacts.math.NaNFunction;
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5 import de.intevation.flys.artifacts.math.UnivariateRealFunctionFunction;
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6
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7 import de.intevation.flys.artifacts.math.fitting.FunctionFactory;
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8
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9 import de.intevation.flys.artifacts.model.QW;
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10
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11 import java.io.Serializable;
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12
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13 import java.lang.ref.SoftReference;
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14
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15 import org.apache.commons.math.analysis.interpolation.SplineInterpolator;
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16
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17 import org.apache.commons.math.exception.MathIllegalArgumentException;
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18
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19 import org.apache.log4j.Logger;
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20
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21 public class Curve
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22 implements Serializable, Function
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23 {
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24 private static Logger log = Logger.getLogger(Curve.class);
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25
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26 protected QW [] qws;
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27 protected String function;
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28 protected double [] coeffs;
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29
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30 // The spline is pretty heavy weight so cache it with a soft ref only.
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31 protected transient SoftReference<Function> spline;
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32 protected transient Function extrapolation;
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33
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34 public Curve() {
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35 }
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36
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37 public Curve(QW [] qws, String function, double [] coeffs) {
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38 this.qws = qws;
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39 this.function = function;
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40 this.coeffs = coeffs;
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41 }
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42
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43 public QW [] getQWs() {
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44 return qws;
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45 }
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46
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47 public String getFunction() {
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48 return function;
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49 }
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50
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51 public double [] getCoeffs() {
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52 return coeffs;
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53 }
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54
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55 @Override
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56 public double value(double x) {
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57 if (x < qws[0].getQ()) return Double.NaN;
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58 return (x <= qws[qws.length-1].getQ()
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59 ? getSpline()
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60 : getExtrapolation()).value(x);
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61 }
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62
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63 protected synchronized Function getExtrapolation() {
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64 if (extrapolation == null) {
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65 de.intevation.flys.artifacts.math.fitting.Function
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66 f = FunctionFactory.getInstance().getFunction(function);
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67
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68 extrapolation = f != null
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69 ? f.instantiate(coeffs)
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70 : NaNFunction.INSTANCE;
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71 }
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72 return extrapolation;
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73 }
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74
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75 protected synchronized Function getSpline() {
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76 Function sp;
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77 if (spline != null) {
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78 if ((sp = spline.get()) != null) {
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79 return sp;
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80 }
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81 }
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82 spline = new SoftReference(sp = createSpline());
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83 return sp;
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84 }
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85
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86 protected Function createSpline() {
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87 SplineInterpolator interpolator = new SplineInterpolator();
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88 double [] qs = new double[qws.length];
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89 double [] ws = new double[qws.length];
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90 for (int i = 0; i < qws.length; ++i) {
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91 QW qw = qws[i];
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92 qs[i] = qw.getQ();
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93 ws[i] = qw.getW();
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94 }
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95 try {
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96 return new UnivariateRealFunctionFunction(
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97 interpolator.interpolate(qs, ws));
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98 }
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99 catch (MathIllegalArgumentException miae) {
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100 log.debug("creation on spline failed", miae);
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101 return NaNFunction.INSTANCE;
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102 }
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103 }
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104 }
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105 // vim:set ts=4 sw=4 si et sta sts=4 fenc=utf-8 :
http://dive4elements.wald.intevation.org