Mercurial > dive4elements > river

annotate artifacts/src/main/java/org/dive4elements/river/artifacts/model/extreme/Curve.java @ 5838:5aa05a7a34b7

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Rename modules to more fitting names.
author Sascha L. Teichmann <teichmann@intevation.de>
date Thu, 25 Apr 2013 15:23:37 +0200
parents flys-artifacts/src/main/java/org/dive4elements/river/artifacts/model/extreme/Curve.java@bd047b71ab37
children 4897a58c8746
rev   line source
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1 package org.dive4elements.river.artifacts.model.extreme;
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2
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3 import org.dive4elements.river.artifacts.math.Function;
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4 import org.dive4elements.river.artifacts.math.NaNFunction;
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5 import org.dive4elements.river.artifacts.math.UnivariateRealFunctionFunction;
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6
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7 import org.dive4elements.river.artifacts.math.fitting.FunctionFactory;
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8
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9 import java.io.Serializable;
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10
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11 import java.lang.ref.SoftReference;
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12
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13 import org.apache.commons.math.analysis.interpolation.SplineInterpolator;
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14
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15 import org.apache.commons.math.exception.MathIllegalArgumentException;
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16
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17 import org.apache.log4j.Logger;
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18
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19 /** An extrapolating W/Q function/curve. */
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20 public class Curve
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21 implements Serializable, Function
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22 {
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23 private static Logger log = Logger.getLogger(Curve.class);
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24
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25 protected double [] qs;
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26 protected double [] ws;
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27 protected String function;
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28 protected double [] coeffs;
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29 protected double chiSqr;
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30
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31 /** Suggested maximum value for q to input. */
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32 protected double suggestedMaxQ;
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33
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34 // The spline is pretty heavy weight so cache it with a soft ref only.
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35 protected transient SoftReference<Function> spline;
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36 protected transient Function extrapolation;
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37
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38 public Curve() {
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39 }
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40
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41 public Curve(
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42 double [] qs,
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43 double [] ws,
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44 String function,
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45 double [] coeffs,
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46 double chiSqr
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47 ) {
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48 this.qs = qs;
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49 this.ws = ws;
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50 this.function = function;
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51 this.coeffs = coeffs;
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52 this.suggestedMaxQ = Double.MAX_VALUE;
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53 }
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54
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55 public double [] getQs() {
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56 return qs;
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57 }
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58
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59 public double [] getWs() {
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60 return ws;
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61 }
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62
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63 public String getFunction() {
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64 return function;
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65 }
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66
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67 public double [] getCoeffs() {
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68 return coeffs;
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69 }
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70
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71
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72 public void setSuggestedMaxQ(double newMaxQ) {
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73 this.suggestedMaxQ = newMaxQ;
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74 }
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75
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76
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77 public double getSuggestedMaxQ() {
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78 return this.suggestedMaxQ;
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79 }
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80
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81
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82 /** Calculate value at given x. */
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83 @Override
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84 public double value(double x) {
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85 if (qs == null || x < qs[0]) return Double.NaN;
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86 return (x <= qs[qs.length-1]
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87 ? getSpline()
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88 : getExtrapolation()).value(x);
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89 }
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90
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91 protected synchronized Function getExtrapolation() {
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92 if (extrapolation == null) {
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93 org.dive4elements.river.artifacts.math.fitting.Function
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94 f = FunctionFactory.getInstance().getFunction(function);
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95
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96 extrapolation = f != null
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97 ? f.instantiate(coeffs)
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98 : NaNFunction.INSTANCE;
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99 }
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100 return extrapolation;
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101 }
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102
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103 /**
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104 * Gets the chiSqr for this instance.
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105 *
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106 * @return The chiSqr.
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107 */
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108 public double getChiSqr() {
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109 return this.chiSqr;
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110 }
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111
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112 /**
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113 * Sets the chiSqr for this instance.
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114 *
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115 * @param chiSqr The chiSqr.
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116 */
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117 public void setChiSqr(double chiSqr) {
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118 this.chiSqr = chiSqr;
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119 }
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120
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121 protected synchronized Function getSpline() {
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122 Function sp;
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123 if (spline != null) {
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124 if ((sp = spline.get()) != null) {
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125 return sp;
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126 }
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127 }
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128 spline = new SoftReference<Function>(sp = createSpline());
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129 return sp;
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130 }
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131
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132 protected Function createSpline() {
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133 SplineInterpolator interpolator = new SplineInterpolator();
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134 try {
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135 return new UnivariateRealFunctionFunction(
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136 interpolator.interpolate(qs, ws));
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137 }
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138 catch (MathIllegalArgumentException miae) {
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139 log.debug("creation on spline failed", miae);
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140 return NaNFunction.INSTANCE;
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141 }
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142 }
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143 }
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144 // vim:set ts=4 sw=4 si et sta sts=4 fenc=utf-8 :
http://dive4elements.wald.intevation.org