Mercurial > dive4elements > river
annotate artifacts/src/main/java/org/dive4elements/river/artifacts/math/WKmsOperation.java @ 8856:5e38e2924c07 3.2.x
Fix code style.
author | Tom Gottfried <tom@intevation.de> |
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date | Thu, 18 Jan 2018 20:12:01 +0100 |
parents | 7d86194661c3 |
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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.math; |
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10 |
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11 import org.dive4elements.river.artifacts.model.WKms; |
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12 import org.dive4elements.river.artifacts.model.WKmsImpl; |
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13 |
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14 import java.util.Arrays; |
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15 |
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16 public abstract class WKmsOperation |
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17 { |
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18 public static final double EPSILON = 1e-6; |
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19 |
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20 public static final class KmW |
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21 implements Comparable<KmW> |
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22 { |
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23 protected double km; |
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24 protected double w; |
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25 |
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26 public KmW(double km, double w) { |
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27 this.km = km; |
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28 this.w = w; |
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29 } |
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30 |
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31 public int compareTo(KmW other) { |
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32 return km < other.km |
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33 ? -1 |
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34 : km > other.km ? +1 : 0; |
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35 } |
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36 |
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37 public boolean kmEquals(KmW other) { |
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38 return Math.abs(km - other.km) < EPSILON; |
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39 } |
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40 |
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41 public double subtract(KmW other) { |
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42 return w - other.w; |
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43 } |
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44 } // class KmW |
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45 |
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46 public static final WKmsOperation SUBTRACTION = new WKmsOperation() { |
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47 |
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48 @Override |
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49 public WKms operate(WKms a, WKms b) { |
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50 return subtract(a, b); |
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51 } |
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52 }; |
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53 |
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54 protected WKmsOperation() { |
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55 } |
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56 |
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57 public abstract WKms operate(WKms a, WKms b); |
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58 |
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59 /** |
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60 * Subtract two series from each other, interpolate values |
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61 * missing in one series in the other. |
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62 */ |
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63 public static WKms subtract(WKms minuend, WKms subtrahend) { |
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64 |
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65 int M = minuend .size(); |
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66 int S = subtrahend.size(); |
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67 |
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68 // Don't subtract empty sets |
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69 if (M < 1 || S < 1) { |
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70 return new WKmsImpl(); |
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71 } |
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72 |
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73 KmW [] ms = new KmW[M]; |
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74 KmW [] ss = new KmW[S]; |
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75 |
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76 for (int i = 0; i < M; ++i) { |
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77 ms[i] = new KmW(minuend.getKm(i), minuend.getW(i)); |
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78 } |
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79 |
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80 for (int i = 0; i < S; ++i) { |
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81 ss[i] = new KmW(subtrahend.getKm(i), subtrahend.getW(i)); |
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82 } |
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83 |
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84 Arrays.sort(ms); |
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85 Arrays.sort(ss); |
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86 |
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87 // no overlap -> empty result set |
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88 if (ms[0].km > ss[S-1].km || ss[0].km > ms[M-1].km) { |
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89 return new WKmsImpl(); |
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90 } |
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91 |
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92 WKmsImpl result = new WKmsImpl(); |
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93 |
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94 int mi = 0; |
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95 int si = 0; |
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96 |
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97 OUT: while (mi < M && si < S) { |
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98 KmW m = ms[mi]; |
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99 KmW s = ss[si]; |
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100 |
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101 if (m.km + EPSILON < s.km) { |
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102 // minuend is before subtrahend |
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103 |
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104 while (ms[mi].km + EPSILON < s.km) { |
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105 if (++mi >= M) { |
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106 break OUT; |
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107 } |
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108 } |
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109 |
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110 if (ms[mi].km + EPSILON > s.km) { |
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111 double mw = Linear.linear( |
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112 s.km, |
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113 ms[mi-1].km, ms[mi].km, |
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114 ms[mi-1].w, ms[mi].w); |
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115 result.add(s.km, mw - s.w); |
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116 ++si; |
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117 } |
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118 else { // s.km == ms[mi].km |
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119 result.add(s.km, ms[mi].subtract(s)); |
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120 ++mi; |
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121 ++si; |
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122 } |
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123 } |
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124 else if (m.km > s.km + EPSILON) { |
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125 // subtrahend is before minuend |
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126 |
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127 while (m.km > ss[si].km + EPSILON) { |
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128 if (++si >= S) { |
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129 break OUT; |
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130 } |
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131 } |
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132 |
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133 if (ss[si].km + EPSILON > m.km) { |
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134 double sw = Linear.linear( |
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135 m.km, |
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136 ss[si-1].km, ss[si].km, |
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137 ss[si-1].w, ss[si].w); |
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138 result.add(m.km, m.w - sw); |
8649
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(issue1754) Increase m index after adding an interpolated result.
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139 ++mi; |
925
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140 } |
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141 else { // ss[si].km == m.km |
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142 result.add(m.km, m.subtract(ss[si])); |
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143 ++mi; |
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144 ++si; |
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145 } |
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146 } |
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147 else { // m.km == s.km |
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148 result.add(s.km, m.subtract(s)); |
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149 ++mi; |
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150 ++si; |
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151 } |
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152 } |
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153 |
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154 return result; |
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155 } |
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156 } |
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157 // vim:set ts=4 sw=4 si et sta sts=4 fenc=utf-8 : |