Mercurial > dive4elements > river

annotate artifacts/src/main/java/org/dive4elements/river/artifacts/model/extreme/Curve.java @ 5863:4897a58c8746

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River artifacts: Added new copyright headers.
author Sascha L. Teichmann <teichmann@intevation.de>
date Sun, 28 Apr 2013 14:40:59 +0200
parents 5aa05a7a34b7
children af13ceeba52a
rev   line source
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4897a58c8746 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.artifacts.model.extreme;
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10
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11 import org.dive4elements.river.artifacts.math.Function;
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12 import org.dive4elements.river.artifacts.math.NaNFunction;
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13 import org.dive4elements.river.artifacts.math.UnivariateRealFunctionFunction;
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14
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15 import org.dive4elements.river.artifacts.math.fitting.FunctionFactory;
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16
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17 import java.io.Serializable;
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18
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19 import java.lang.ref.SoftReference;
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20
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21 import org.apache.commons.math.analysis.interpolation.SplineInterpolator;
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22
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23 import org.apache.commons.math.exception.MathIllegalArgumentException;
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24
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25 import org.apache.log4j.Logger;
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26
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27 /** An extrapolating W/Q function/curve. */
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28 public class Curve
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29 implements Serializable, Function
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30 {
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31 private static Logger log = Logger.getLogger(Curve.class);
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32
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33 protected double [] qs;
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34 protected double [] ws;
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35 protected String function;
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36 protected double [] coeffs;
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37 protected double chiSqr;
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38
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39 /** Suggested maximum value for q to input. */
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40 protected double suggestedMaxQ;
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41
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42 // The spline is pretty heavy weight so cache it with a soft ref only.
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43 protected transient SoftReference<Function> spline;
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44 protected transient Function extrapolation;
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45
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46 public Curve() {
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47 }
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48
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49 public Curve(
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50 double [] qs,
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51 double [] ws,
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52 String function,
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53 double [] coeffs,
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54 double chiSqr
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55 ) {
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56 this.qs = qs;
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57 this.ws = ws;
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58 this.function = function;
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59 this.coeffs = coeffs;
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60 this.suggestedMaxQ = Double.MAX_VALUE;
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61 }
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62
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63 public double [] getQs() {
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64 return qs;
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65 }
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66
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67 public double [] getWs() {
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68 return ws;
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69 }
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70
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71 public String getFunction() {
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72 return function;
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73 }
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74
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75 public double [] getCoeffs() {
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76 return coeffs;
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77 }
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78
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79
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80 public void setSuggestedMaxQ(double newMaxQ) {
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81 this.suggestedMaxQ = newMaxQ;
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82 }
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83
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84
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85 public double getSuggestedMaxQ() {
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86 return this.suggestedMaxQ;
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87 }
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88
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89
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90 /** Calculate value at given x. */
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91 @Override
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92 public double value(double x) {
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93 if (qs == null || x < qs[0]) return Double.NaN;
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94 return (x <= qs[qs.length-1]
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95 ? getSpline()
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96 : getExtrapolation()).value(x);
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97 }
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98
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99 protected synchronized Function getExtrapolation() {
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100 if (extrapolation == null) {
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101 org.dive4elements.river.artifacts.math.fitting.Function
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102 f = FunctionFactory.getInstance().getFunction(function);
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103
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104 extrapolation = f != null
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105 ? f.instantiate(coeffs)
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106 : NaNFunction.INSTANCE;
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107 }
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108 return extrapolation;
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109 }
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110
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111 /**
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112 * Gets the chiSqr for this instance.
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113 *
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114 * @return The chiSqr.
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115 */
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116 public double getChiSqr() {
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117 return this.chiSqr;
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118 }
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119
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120 /**
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121 * Sets the chiSqr for this instance.
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122 *
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123 * @param chiSqr The chiSqr.
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124 */
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125 public void setChiSqr(double chiSqr) {
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126 this.chiSqr = chiSqr;
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127 }
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128
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129 protected synchronized Function getSpline() {
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130 Function sp;
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131 if (spline != null) {
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132 if ((sp = spline.get()) != null) {
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133 return sp;
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134 }
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135 }
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136 spline = new SoftReference<Function>(sp = createSpline());
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137 return sp;
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138 }
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139
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140 protected Function createSpline() {
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141 SplineInterpolator interpolator = new SplineInterpolator();
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142 try {
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143 return new UnivariateRealFunctionFunction(
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144 interpolator.interpolate(qs, ws));
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145 }
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146 catch (MathIllegalArgumentException miae) {
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147 log.debug("creation on spline failed", miae);
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148 return NaNFunction.INSTANCE;
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149 }
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150 }
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151 }
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152 // vim:set ts=4 sw=4 si et sta sts=4 fenc=utf-8 :
http://dive4elements.wald.intevation.org