Mercurial > dive4elements > river

annotate artifacts/src/main/java/org/dive4elements/river/artifacts/math/WKmsOperation.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/math/WKmsOperation.java@bd047b71ab37
children 4897a58c8746
rev   line source
5831
bd047b71ab37 Repaired internal references
Sascha L. Teichmann <teichmann@intevation.de>
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1 package org.dive4elements.river.artifacts.math;
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2
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3 import org.dive4elements.river.artifacts.model.WKms;
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4 import org.dive4elements.river.artifacts.model.WKmsImpl;
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5
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6 import java.util.Arrays;
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7
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8 public abstract class WKmsOperation
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9 {
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10 public static final double EPSILON = 1e-6;
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11
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12 public static final class KmW
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13 implements Comparable<KmW>
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14 {
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15 protected double km;
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16 protected double w;
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17
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18 public KmW(double km, double w) {
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19 this.km = km;
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20 this.w = w;
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21 }
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22
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23 public int compareTo(KmW other) {
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24 return km < other.km
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25 ? -1
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26 : km > other.km ? +1 : 0;
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27 }
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28
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29 public boolean kmEquals(KmW other) {
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30 return Math.abs(km - other.km) < EPSILON;
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31 }
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32
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33 public double subtract(KmW other) {
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34 return w - other.w;
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35 }
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36 } // class KmW
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37
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38 public static final WKmsOperation SUBTRACTION = new WKmsOperation() {
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39
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40 @Override
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41 public WKms operate(WKms a, WKms b) {
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42 return subtract(a, b);
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43 }
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44 };
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45
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46 protected WKmsOperation() {
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47 }
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48
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49 public abstract WKms operate(WKms a, WKms b);
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50
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302461d5d071 Cosmetics.
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51 /**
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52 * Subtract two series from each other, interpolate values
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53 * missing in one series in the other.
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54 */
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55 public static WKms subtract(WKms minuend, WKms subtrahend) {
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56
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57 int M = minuend .size();
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58 int S = subtrahend.size();
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59
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60 // Don't subtract empty sets
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61 if (M < 1 || S < 1) {
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62 return new WKmsImpl();
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63 }
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64
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65 KmW [] ms = new KmW[M];
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66 KmW [] ss = new KmW[S];
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67
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68 for (int i = 0; i < M; ++i) {
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69 ms[i] = new KmW(minuend.getKm(i), minuend.getW(i));
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70 }
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71
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72 for (int i = 0; i < S; ++i) {
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73 ss[i] = new KmW(subtrahend.getKm(i), subtrahend.getW(i));
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74 }
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75
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76 Arrays.sort(ms);
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77 Arrays.sort(ss);
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78
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79 // no overlap -> empty result set
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80 if (ms[0].km > ss[S-1].km || ss[0].km > ms[M-1].km) {
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81 return new WKmsImpl();
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82 }
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83
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84 WKmsImpl result = new WKmsImpl();
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85
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86 int mi = 0;
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87 int si = 0;
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88
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89 OUT: while (mi < M && si < S) {
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90 KmW m = ms[mi];
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91 KmW s = ss[si];
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92
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93 if (m.km + EPSILON < s.km) {
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94 // minuend is before subtrahend
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95
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96 while (ms[mi].km + EPSILON < s.km) {
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97 if (++mi >= M) {
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98 break OUT;
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99 }
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100 }
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101
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102 if (ms[mi].km + EPSILON > s.km) {
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103 double mw = Linear.linear(
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104 s.km,
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105 ms[mi-1].km, ms[mi].km,
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106 ms[mi-1].w, ms[mi].w);
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107 result.add(s.km, mw - s.w);
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108 ++si;
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109 }
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110 else { // s.km == ms[mi].km
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111 result.add(s.km, ms[mi].subtract(s));
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112 ++mi;
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113 ++si;
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114 }
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115 }
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116 else if (m.km > s.km + EPSILON) {
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117 // subtrahend is before minuend
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118
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119 while (m.km > ss[si].km + EPSILON) {
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120 if (++si >= S) {
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121 break OUT;
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122 }
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123 }
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124
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125 if (ss[si].km + EPSILON > m.km) {
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126 double sw = Linear.linear(
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127 m.km,
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128 ss[si-1].km, ss[si].km,
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129 ss[si-1].w, ss[si].w);
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130 result.add(m.km, m.w - sw);
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131 }
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132 else { // ss[si].km == m.km
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133 result.add(m.km, m.subtract(ss[si]));
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134 ++mi;
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135 ++si;
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136 }
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137 }
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138 else { // m.km == s.km
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139 result.add(s.km, m.subtract(s));
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parents:
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140 ++mi;
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parents:
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141 ++si;
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142 }
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143 }
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144
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145 return result;
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parents:
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146 }
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147 }
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parents:
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148 // vim:set ts=4 sw=4 si et sta sts=4 fenc=utf-8 :
http://dive4elements.wald.intevation.org