Mercurial > dive4elements > river

annotate flys-artifacts/src/main/java/de/intevation/flys/artifacts/model/DischargeTables.java @ 333:67b3f54188aa

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Discharge tables: Sorting of q values was done wrong. flys-artifacts/trunk@1731 c6561f87-3c4e-4783-a992-168aeb5c3f6f
author Sascha L. Teichmann <sascha.teichmann@intevation.de>
date Tue, 19 Apr 2011 14:48:28 +0000
parents 0b2358bc716d
children b7c8df643dc4
rev   line source
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e8dfe6ba2000 Fetch w/q values of discharge tables for given gauges.
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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 protected List<String> gaugeNames;
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32 protected String riverName;
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34 protected double scale;
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36 protected int kind;
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38 protected Map<String, double [][]> values;
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40 public DischargeTables() {
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41 }
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42
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43 public DischargeTables(String riverName, String gaugeName) {
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44 this(riverName, gaugeName, MASTER);
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45 }
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46
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47 public DischargeTables(String riverName, String gaugeName, int kind) {
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48 this(riverName, new String [] { gaugeName }, kind);
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49 }
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51 public DischargeTables(String riverName, String [] gaugeNames) {
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52 this(riverName, gaugeNames, MASTER);
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53 }
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55 public DischargeTables(String riverName, String [] gaugeNames, int kind) {
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56 this(riverName, Arrays.asList(gaugeNames), kind);
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57 }
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59 public DischargeTables(
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60 String riverName,
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61 List<String> gaugeNames,
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62 int kind
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63 ) {
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64 scale = Double.NaN;
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65 this.kind = kind;
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66 this.riverName = riverName;
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67 this.gaugeNames = gaugeNames;
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68 }
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69
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70 public double [][] getFirstTable() {
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71 return getFirstTable(DEFAULT_SCALE);
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72 }
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74 public double [][] getFirstTable(double scale) {
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75 Map<String, double [][]> values = getValues(scale);
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76 for (double [][] table: values.values()) {
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77 return table;
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78 }
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79 return null;
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80 }
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81
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82 public Map<String, double [][]> getValues() {
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83 return getValues(DEFAULT_SCALE);
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84 }
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85
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86 public Map<String, double [][]> getValues(double scale) {
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87 if (values == null || scale != this.scale) {
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88 values = loadValues(scale);
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89 this.scale = scale;
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90 }
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91 return values;
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92 }
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93
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94 protected Map<String, double [][]> loadValues(double scale) {
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95 Map<String, double [][]> values = new HashMap<String, double [][]>();
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96
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97 Session session = SessionHolder.HOLDER.get();
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99 Query gaugeQuery = session.createQuery(
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100 "from Gauge where name=:gauge and river.name=:river and kind=:kind");
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101 gaugeQuery.setParameter("river", riverName);
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102 gaugeQuery.setInteger("kind", kind);
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103
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104 for (String gaugeName: gaugeNames) {
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105 gaugeQuery.setParameter("gauge", gaugeName);
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106 List<Gauge> gauges = gaugeQuery.list();
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107 if (gauges.isEmpty()) {
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108 log.warn(
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109 "no gauge '"+gaugeName+"' at river '"+riverName+"'");
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110 continue;
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111 }
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112 Gauge gauge = gauges.get(0);
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113
311
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114 List<DischargeTable> tables = gauge.getDischargeTables();
146
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115
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116 if (tables.isEmpty()) {
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117 log.warn(
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118 "no discharge table for gauge '" + gaugeName + "'");
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119 continue;
146
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120 }
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121
311
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122 // TODO: Filter by time interval
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123 DischargeTable table = tables.get(0);
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124
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125 List<DischargeTableValue> dtvs =
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126 table.getDischargeTableValues();
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127
333
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128 final double [][] vs = new double[2][dtvs.size()];
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129
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130 boolean qSorted = true;
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131
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132 double lastQ = -Double.MAX_VALUE;
311
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133
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134 int idx = 0;
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135 for (DischargeTableValue dtv: dtvs) {
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136 double q = dtv.getQ().doubleValue();
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137 vs[0][idx] = q * scale;
311
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138 vs[1][idx] = dtv.getW().doubleValue() * scale;
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139 ++idx;
333
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140
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141 if (qSorted && lastQ > q) {
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142 qSorted = false;
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143 }
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144 lastQ = q;
311
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145 }
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146
333
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147 if (!qSorted) {
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148 log.debug("need to sort by q values");
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149 // TODO: Do this db level.
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150 // XXX: This is so ugly :-(
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151 Integer [] indices = new Integer[vs[0].length];
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152 for (int i = 0; i < indices.length; ++i) {
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153 indices[i] = i;
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154 }
329
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155
333
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156 Arrays.sort(indices, new Comparator<Integer>() {
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157 public int compare(Integer a, Integer b) {
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158 double va = vs[1][a];
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159 double vb = vs[1][b];
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160 double d = va - vb;
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161 if (d < 0.0) return -1;
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162 if (d > 0.0) return +1;
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163 return 0;
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164 }
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165 });
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166
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167 double [][] vs2 = new double[2][vs[0].length];
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168 for (int i = 0; i < indices.length; ++i) {
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169 vs2[0][i] = vs[0][indices[i]];
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170 vs2[1][i] = vs[0][indices[i]];
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171 }
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172 values.put(gaugeName, vs2);
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173 }
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174 else {
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175 values.put(gaugeName, vs);
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176 }
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177
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178 }
311
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179
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180 return values;
146
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181 }
329
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182
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183 public static boolean getWForQ(
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184 double [][] values,
333
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185 double q,
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186 double [] result
329
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187 ) {
333
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188 int index = Arrays.binarySearch(values[1], q);
329
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189 if (index >= 0) {
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190 result[0] = values[1][index];
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191 return true;
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192 }
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193
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194 index = -index - 1; // insert position
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195
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196 if (index == 0 || index+1 >= values.length) {
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197 // do not extraploate
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198 return false;
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199 }
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200
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201 double q1 = values[index ][0];
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202 double q2 = values[index+1][0];
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203 double w1 = values[index ][1];
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204 double w2 = values[index+1][1];
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205
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206 // w1 = m*q1 + b
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207 // w2 = m*q2 + b
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208 // w2 - w1 = m*(q2 - q1)
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209 // m = (w2 - w1)/(q2 - q1) # q2 != q1
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210 // b = w1 - m*q1
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211
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212 if (q1 == q2) {
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213 result[0] = 0.5*(w1 + w2);
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214 }
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215 else {
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diff changeset
216 double m = (w2 - w1)/(q2 - q1);
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217 double b = w1 - m*q1;
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218 result[0] = q*m + b;
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219 }
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220
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221 return true;
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222 }
146
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223 }
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224 // vim:set ts=4 sw=4 si et sta sts=4 fenc=utf8 :
http://dive4elements.wald.intevation.org