annotate flys-artifacts/src/main/java/de/intevation/flys/artifacts/model/WstValueTable.java @ 335:64cfbd631f29

Implemented the "Wasserstand/Wasserspiegellagen" calculation. flys-artifacts/trunk@1733 c6561f87-3c4e-4783-a992-168aeb5c3f6f
author Sascha L. Teichmann <sascha.teichmann@intevation.de>
date Tue, 19 Apr 2011 17:43:39 +0000
parents e09634fbf6bc
children 4509ba8fae68
rev   line source
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1 package de.intevation.flys.artifacts.model;
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2
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3 import java.io.Serializable;
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4
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5 import de.intevation.flys.model.River;
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6 import de.intevation.flys.model.Wst;
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7 import de.intevation.flys.model.WstColumn;
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8
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9 import de.intevation.flys.backend.SessionHolder;
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10
335
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11 import java.util.Arrays;
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12 import java.util.ArrayList;
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13 import java.util.Comparator;
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14 import java.util.List;
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15 import java.util.Collections;
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16 import java.util.Iterator;
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17
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18 import org.hibernate.Session;
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19 import org.hibernate.Query;
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20 import org.hibernate.SQLQuery;
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21
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22 import org.hibernate.type.StandardBasicTypes;
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23
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24 public class WstValueTable
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25 implements Serializable
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26 {
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27
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28 // TODO: put this into a property file
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29 public static final String SQL_POS_WQ =
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30 "SELECT position, w, q, column_pos" +
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31 " FROM wst_value_table" +
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32 " WHERE wst_id = :wst_id";
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33
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34 public static class Column
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35 implements Serializable
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36 {
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37 protected String name;
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38
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39 public Column() {
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40 }
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41
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42 public Column(String name) {
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43 this.name = name;
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44 }
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45
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46 public String getName() {
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47 return name;
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48 }
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49
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50 public void setName(String name) {
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51 this.name = name;
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52 }
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53 }
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54 // class Column
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55
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56 public static class Row
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57 implements Serializable, Comparable<Row>
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58 {
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59 double km;
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60 double [] ws;
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61 double [] qs;
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62 boolean qSorted;
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63
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64 public Row() {
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65 }
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66
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67 public Row(double km) {
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68 this.km = km;
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69 }
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70
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71 public Row(double km, double [] ws, double [] qs) {
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72 this(km);
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73 this.ws = ws;
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74 this.qs = qs;
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75 }
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76
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77 public static final double linear(
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78 double x,
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79 double x1, double x2,
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80 double y1, double y2
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81 ) {
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82 // y1 = m*x1 + b
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83 // y2 = m*x2 + b
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84 // y2 - y1 = m*(x2 - x1)
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85 // m = (y2 - y1)/(x2 - x1) # x2 != x1
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86 // b = y1 - m*x1
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87
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88 if (x1 == x2) {
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89 return 0.5*(y1 + y2);
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90 }
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91 double m = (y2 - y1)/(x2 - x1);
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92 double b = y1 - m*x1;
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93 return x*m + b;
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94 }
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95
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96 public static final double factor(double x, double p1, double p2) {
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97 // 0 = m*p1 + b <=> b = -m*p1
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98 // 1 = m*p2 + b
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99 // 1 = m*(p2 - p1)
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100 // m = 1/(p2 - p1) # p1 != p2
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101 // f(x) = x/(p2-p1) - p1/(p2-p1) <=> (x-p1)/(p2-p1)
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102
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103 return p1 == p2 ? 0.0 : (x-p1)/(p2-p1);
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104 }
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105
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106 public static final double weight(double factor, double a, double b) {
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107 return (1.0-factor)*a + factor*b;
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108 }
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109
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110 public double getWForKM(Row other, int index, double km) {
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111 double w1 = ws[index];
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112 double w2 = other.ws[index];
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113 double km1 = this.km;
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114 double km2 = other.km;
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115 return linear(km, km1, km2, w1, w2);
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116 }
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117
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diff changeset
118 public void interpolateW(
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119 Row other,
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diff changeset
120 double km,
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diff changeset
121 double [] input,
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diff changeset
122 double [] output
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diff changeset
123 ) {
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124 double factor = factor(km, this.km, other.km);
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diff changeset
125
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diff changeset
126 for (int i = 0; i < input.length; ++i) {
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127 double q = input[i];
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diff changeset
128 int idx1 = getQIndex(q);
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129 int idx2 = other.getQIndex(q);
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130
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diff changeset
131 double w1 = idx1 >= 0
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132 ? ws[idx1]
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133 : interpolateW(-idx1-1, q);
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134
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diff changeset
135 double w2 = idx2 >= 0
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136 ? other.ws[idx2]
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137 : other.interpolateW(-idx2-1, q);
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138
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diff changeset
139 output[i] = weight(factor, w1, w2);
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140 }
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141 }
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142
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diff changeset
143 public double interpolateW(int idx, double q) {
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144 return idx < 1 || idx >= qs.length
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145 ? Double.NaN // do not extrapolate
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146 : linear(q, qs[idx-1], qs[idx], ws[idx-1], ws[idx]);
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147 }
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diff changeset
148
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diff changeset
149 public double interpolateW(double q) {
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diff changeset
150 if (Double.isNaN(q)) return Double.NaN;
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diff changeset
151 int index = getQIndex(q);
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diff changeset
152 return index >= 0 ? ws[index] : interpolateW(-index -1);
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diff changeset
153 }
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diff changeset
154
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diff changeset
155 public int getQIndex(double q) {
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156 return qSorted ? binaryQIndex(q) : linearQIndex(q);
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diff changeset
157 }
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158
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diff changeset
159 public int binaryQIndex(double q) {
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160 return Arrays.binarySearch(qs, q);
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161 }
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diff changeset
162
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diff changeset
163 public int linearQIndex(double q) {
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164 switch (qs.length) {
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diff changeset
165 case 0: break;
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166 case 1:
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167 if (qs[0] == q) return 0;
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168 if (qs[0] < q) return -(1+1);
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169 return -(0+1);
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diff changeset
170 default:
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171 for (int i = 1; i < qs.length; ++i) {
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172 double qa = qs[i-1];
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173 double qb = qs[i];
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174 if (qa == q) return i-1;
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175 if (qb == q) return i;
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diff changeset
176 if (qa > qb) { double t = qa; qa = qb; qb = t; }
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diff changeset
177 if (q > qa && q < qb) return -(i+1);
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178 }
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179 return -qs.length;
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180 }
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181
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diff changeset
182 return -1;
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183 }
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184
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diff changeset
185 public int compareTo(Row other) {
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186 double d = km - other.km;
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diff changeset
187 if (d < 0.0) return -1;
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diff changeset
188 if (d > 0.0) return +1;
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diff changeset
189 return 0;
326
07eba6d3b4a5 Fetches w/q value tables from the backend.
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190 }
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191 }
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parents:
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192 // class Row
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193
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194 protected List<Row> rows;
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195
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196 protected Column [] columns;
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197
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198 public WstValueTable() {
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199 rows = new ArrayList<Row>();
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200 }
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201
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diff changeset
202 public WstValueTable(Column [] columns) {
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diff changeset
203 this();
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diff changeset
204 this.columns = columns;
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diff changeset
205 }
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parents:
diff changeset
206
335
64cfbd631f29 Implemented the "Wasserstand/Wasserspiegellagen" calculation.
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diff changeset
207
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diff changeset
208 public double [] interpolateW(double km, double [] qs) {
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diff changeset
209
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parents: 327
diff changeset
210 double [] ws = new double[qs.length];
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diff changeset
211
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parents: 327
diff changeset
212 int rowIndex = Collections.binarySearch(rows, new Row(km));
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diff changeset
213
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parents: 327
diff changeset
214 if (rowIndex >= 0) { // direct row match
64cfbd631f29 Implemented the "Wasserstand/Wasserspiegellagen" calculation.
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parents: 327
diff changeset
215 Row row = rows.get(rowIndex);
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parents: 327
diff changeset
216 for (int i = 0; i < qs.length; ++i) {
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parents: 327
diff changeset
217 ws[i] = row.interpolateW(qs[i]);
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parents: 327
diff changeset
218 }
64cfbd631f29 Implemented the "Wasserstand/Wasserspiegellagen" calculation.
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parents: 327
diff changeset
219 }
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parents: 327
diff changeset
220 else { // needs bilinear interpolation
64cfbd631f29 Implemented the "Wasserstand/Wasserspiegellagen" calculation.
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parents: 327
diff changeset
221 rowIndex = -rowIndex -1;
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parents: 327
diff changeset
222
64cfbd631f29 Implemented the "Wasserstand/Wasserspiegellagen" calculation.
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parents: 327
diff changeset
223 if (rowIndex < 1 || rowIndex >= rows.size()) {
64cfbd631f29 Implemented the "Wasserstand/Wasserspiegellagen" calculation.
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parents: 327
diff changeset
224 // do not extrapolate
64cfbd631f29 Implemented the "Wasserstand/Wasserspiegellagen" calculation.
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parents: 327
diff changeset
225 Arrays.fill(ws, Double.NaN);
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parents: 327
diff changeset
226 }
64cfbd631f29 Implemented the "Wasserstand/Wasserspiegellagen" calculation.
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parents: 327
diff changeset
227 else {
64cfbd631f29 Implemented the "Wasserstand/Wasserspiegellagen" calculation.
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parents: 327
diff changeset
228 rows.get(rowIndex-1).interpolateW(
64cfbd631f29 Implemented the "Wasserstand/Wasserspiegellagen" calculation.
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parents: 327
diff changeset
229 rows.get(rowIndex),
64cfbd631f29 Implemented the "Wasserstand/Wasserspiegellagen" calculation.
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parents: 327
diff changeset
230 km, qs, ws);
64cfbd631f29 Implemented the "Wasserstand/Wasserspiegellagen" calculation.
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parents: 327
diff changeset
231 }
64cfbd631f29 Implemented the "Wasserstand/Wasserspiegellagen" calculation.
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parents: 327
diff changeset
232 }
64cfbd631f29 Implemented the "Wasserstand/Wasserspiegellagen" calculation.
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parents: 327
diff changeset
233
64cfbd631f29 Implemented the "Wasserstand/Wasserspiegellagen" calculation.
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parents: 327
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234 return ws;
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235 }
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236
326
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237 public static WstValueTable getTable(River river) {
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238 return getTable(river, 0);
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239 }
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240
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241 public static WstValueTable getTable(River river, int kind) {
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242
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243 Session session = SessionHolder.HOLDER.get();
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244
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245 Query query = session.createQuery(
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246 "from Wst where river=:river and kind=:kind");
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247 query.setParameter("river", river);
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248 query.setInteger("kind", kind);
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249
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250 List<Wst> wsts = query.list();
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251
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252 if (wsts.isEmpty()) {
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253 return null;
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254 }
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255
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256 Wst wst = wsts.get(0);
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257
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258 // TODO: Do this sorting at database level
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259 List<WstColumn> wstColumns = new ArrayList(wst.getColumns());
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260 Collections.sort(wstColumns, new Comparator<WstColumn>() {
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261 public int compare(WstColumn a, WstColumn b) {
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262 int pa = a.getPosition();
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263 int pb = b.getPosition();
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264 if (pa < pb) return -1;
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265 if (pa > pb) return +1;
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266 return 0;
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267 }
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268 });
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269
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270 Column [] columns = new Column[wstColumns.size()];
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271 for (int i = 0; i < columns.length; ++i) {
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272 columns[i] = new Column(wstColumns.get(i).getName());
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273 }
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274
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275 // using native SQL here to avoid myriad of small objects.
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276 SQLQuery sqlQuery = session.createSQLQuery(SQL_POS_WQ)
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277 .addScalar("position", StandardBasicTypes.DOUBLE)
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278 .addScalar("w", StandardBasicTypes.DOUBLE)
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279 .addScalar("q", StandardBasicTypes.DOUBLE)
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280 .addScalar("column_pos", StandardBasicTypes.INTEGER);
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281
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282 sqlQuery.setInteger("wst_id", wst.getId());
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283
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284 WstValueTable valueTable = new WstValueTable(columns);
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285
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286 int lastColumnNo = -1;
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287 Row row = null;
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288
335
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289 Double lastQ = -Double.MAX_VALUE;
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290 boolean qSorted = true;
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291
326
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292 for (Iterator<Object []> iter = sqlQuery.iterate(); iter.hasNext();) {
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293 Object [] result = iter.next();
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294 double km = (Double) result[0];
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295 Double w = (Double) result[1];
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296 Double q = (Double) result[2];
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297 int columnNo = (Integer)result[3];
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298
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299 if (columnNo > lastColumnNo) { // new row
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300 if (row != null) {
335
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301 row.qSorted = qSorted;
326
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302 valueTable.rows.add(row);
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303 }
335
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304 row = new Row(
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305 km,
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306 new double[columnNo+1],
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307 new double[columnNo+1]);
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308 lastQ = -Double.MAX_VALUE;
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309 qSorted = true;
326
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310 }
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311
335
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312 row.ws[columnNo] = w != null ? w : Double.NaN;
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313 row.qs[columnNo] = q != null ? q : Double.NaN;
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314
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315 if (qSorted && (q == null || lastQ > q)) {
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316 qSorted = false;
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317 }
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318 lastQ = q;
326
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319
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320 lastColumnNo = columnNo;
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321 }
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322
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323 if (row != null) {
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324 valueTable.rows.add(row);
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325 }
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326
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327 return valueTable;
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328 }
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329 }
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330 // vim:set ts=4 sw=4 si et sta sts=4 fenc=utf8 :

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