Mercurial > dive4elements > river

annotate flys-artifacts/src/main/java/de/intevation/flys/artifacts/model/DischargeTables.java @ 329:0b2358bc716d

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Discharge table: Added static method getWForQ() to interpolate a w value for a given q value based on a given discharge table. flys-artifacts/trunk@1727 c6561f87-3c4e-4783-a992-168aeb5c3f6f
author Sascha L. Teichmann <sascha.teichmann@intevation.de>
date Tue, 19 Apr 2011 11:05:27 +0000
parents 07e642030172
children 67b3f54188aa
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.util.List;
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4 import java.util.Map;
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5 import java.util.HashMap;
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6 import java.util.Arrays;
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7 import java.util.Comparator;
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8
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9 import java.io.Serializable;
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11 import org.hibernate.Session;
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12 import org.hibernate.Query;
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14 import org.apache.log4j.Logger;
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16 import de.intevation.flys.backend.SessionHolder;
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17 import de.intevation.flys.model.Gauge;
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18 import de.intevation.flys.model.DischargeTable;
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19 import de.intevation.flys.model.DischargeTableValue;
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21 public class DischargeTables
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22 implements Serializable
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23 {
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24 private static Logger log = Logger.getLogger(DischargeTables.class);
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26 public static final double DEFAULT_SCALE = 100.0;
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28 public static final int MASTER = 0;
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30 public static final double EPSILON = 1e-5;
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32 public static Comparator<double []> Q_COMPARATOR =
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33 new Comparator<double []>() {
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34 public int compare(double [] a, double [] b) {
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35 double d = a[0] - b[0];
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36 if (d < -EPSILON) return -1;
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37 if (d > +EPSILON) return +1;
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38 return 0;
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39 }
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40 };
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42 protected List<String> gaugeNames;
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44 protected String riverName;
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45
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46 protected double scale;
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47
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48 protected int kind;
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50 protected Map<String, double [][]> values;
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52 public DischargeTables() {
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53 }
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54
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55 public DischargeTables(String riverName, String gaugeName) {
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56 this(riverName, gaugeName, MASTER);
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57 }
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59 public DischargeTables(String riverName, String gaugeName, int kind) {
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60 this(riverName, new String [] { gaugeName }, kind);
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61 }
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63 public DischargeTables(String riverName, String [] gaugeNames) {
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64 this(riverName, gaugeNames, MASTER);
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65 }
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67 public DischargeTables(String riverName, String [] gaugeNames, int kind) {
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68 this(riverName, Arrays.asList(gaugeNames), kind);
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69 }
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71 public DischargeTables(
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72 String riverName,
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73 List<String> gaugeNames,
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74 int kind
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75 ) {
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76 scale = Double.NaN;
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77 this.kind = kind;
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78 this.riverName = riverName;
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79 this.gaugeNames = gaugeNames;
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80 }
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81
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82 public double [][] getFirstTable() {
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83 return getFirstTable(DEFAULT_SCALE);
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84 }
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85
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86 public double [][] getFirstTable(double scale) {
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87 Map<String, double [][]> values = getValues(scale);
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88 for (double [][] table: values.values()) {
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89 return table;
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90 }
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91 return null;
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92 }
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93
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94 public Map<String, double [][]> getValues() {
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95 return getValues(DEFAULT_SCALE);
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96 }
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97
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98 public Map<String, double [][]> getValues(double scale) {
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99 if (values == null || scale != this.scale) {
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100 values = loadValues(scale);
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101 this.scale = scale;
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102 }
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103 return values;
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104 }
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105
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106 protected Map<String, double [][]> loadValues(double scale) {
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107 Map<String, double [][]> values = new HashMap<String, double [][]>();
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108
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109 Session session = SessionHolder.HOLDER.get();
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111 Query gaugeQuery = session.createQuery(
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112 "from Gauge where name=:gauge and river.name=:river and kind=:kind");
311
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113 gaugeQuery.setParameter("river", riverName);
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114 gaugeQuery.setInteger("kind", kind);
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115
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116 for (String gaugeName: gaugeNames) {
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117 gaugeQuery.setParameter("gauge", gaugeName);
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118 List<Gauge> gauges = gaugeQuery.list();
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119 if (gauges.isEmpty()) {
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120 log.warn(
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121 "no gauge '"+gaugeName+"' at river '"+riverName+"'");
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122 continue;
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123 }
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124 Gauge gauge = gauges.get(0);
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125
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126 List<DischargeTable> tables = gauge.getDischargeTables();
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127
311
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128 if (tables.isEmpty()) {
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129 log.warn(
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130 "no discharge table for gauge '" + gaugeName + "'");
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131 continue;
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132 }
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133
311
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134 // TODO: Filter by time interval
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135 DischargeTable table = tables.get(0);
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136
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137 List<DischargeTableValue> dtvs =
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138 table.getDischargeTableValues();
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139
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140 double [][] vs = new double[2][dtvs.size()];
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141
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142 int idx = 0;
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143 for (DischargeTableValue dtv: dtvs) {
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144 vs[0][idx] = dtv.getQ().doubleValue() * scale;
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145 vs[1][idx] = dtv.getW().doubleValue() * scale;
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146 ++idx;
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147 }
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148
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149 // TODO: Do this db level.
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150 Arrays.sort(vs, Q_COMPARATOR);
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151
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152 values.put(gaugeName, vs);
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153 }
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154
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155 return values;
146
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156 }
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157
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158 public static boolean getWForQ(
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159 double [][] values,
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160 double q,
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161 double [] result
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162 ) {
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163 int index = Arrays.binarySearch(values, new double [] { q }, Q_COMPARATOR);
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164 if (index >= 0) {
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165 result[0] = values[1][index];
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166 return true;
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167 }
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168
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169 index = -index - 1; // insert position
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170
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171 if (index == 0 || index+1 >= values.length) {
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172 // do not extraploate
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173 return false;
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174 }
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175
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176 double q1 = values[index ][0];
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177 double q2 = values[index+1][0];
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178 double w1 = values[index ][1];
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179 double w2 = values[index+1][1];
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180
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181 // w1 = m*q1 + b
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182 // w2 = m*q2 + b
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183 // w2 - w1 = m*(q2 - q1)
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184 // m = (w2 - w1)/(q2 - q1) # q2 != q1
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185 // b = w1 - m*q1
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186
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187 if (q1 == q2) {
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188 result[0] = 0.5*(w1 + w2);
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189 }
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190 else {
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191 double m = (w2 - w1)/(q2 - q1);
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192 double b = w1 - m*q1;
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193 result[0] = q*m + b;
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194 }
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195
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196 return true;
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197 }
146
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198 }
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199 // vim:set ts=4 sw=4 si et sta sts=4 fenc=utf8 :
http://dive4elements.wald.intevation.org