Mercurial > dive4elements > river

annotate flys-artifacts/src/main/java/de/intevation/flys/artifacts/model/DischargeTables.java @ 365:c13ca9d632d6

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Introduced GNU Trove to store WQKms values in a more performant data structure. flys-artifacts/trunk@1773 c6561f87-3c4e-4783-a992-168aeb5c3f6f
author Ingo Weinzierl <ingo.weinzierl@intevation.de>
date Fri, 29 Apr 2011 08:28:44 +0000
parents ec17fad34061
children aa0889141b15
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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13
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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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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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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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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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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");
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101 gaugeQuery.setParameter("river", riverName);
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103 for (String gaugeName: gaugeNames) {
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104 gaugeQuery.setParameter("gauge", gaugeName);
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105 List<Gauge> gauges = gaugeQuery.list();
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106 if (gauges.isEmpty()) {
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107 log.warn(
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108 "no gauge '"+gaugeName+"' at river '"+riverName+"'");
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109 continue;
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110 }
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111 Gauge gauge = gauges.get(0);
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112
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113 List<DischargeTable> tables = gauge.getDischargeTables();
146
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114
311
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115 if (tables.isEmpty()) {
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116 log.warn(
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117 "no discharge table for gauge '" + gaugeName + "'");
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118 continue;
146
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119 }
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120
311
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121 // TODO: Filter by time interval
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122 DischargeTable table = tables.get(0);
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123
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124 List<DischargeTableValue> dtvs =
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125 table.getDischargeTableValues();
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126
333
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127 final double [][] vs = new double[2][dtvs.size()];
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128
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129 boolean qSorted = true;
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130
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131 double lastQ = -Double.MAX_VALUE;
311
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132
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133 int idx = 0;
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134 for (DischargeTableValue dtv: dtvs) {
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135 double q = dtv.getQ().doubleValue();
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136 vs[0][idx] = q * scale;
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137 vs[1][idx] = dtv.getW().doubleValue() * scale;
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138 ++idx;
333
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139
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140 if (qSorted && lastQ > q) {
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141 qSorted = false;
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142 }
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143 lastQ = q;
311
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144 }
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145
333
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146 if (!qSorted) {
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147 log.debug("need to sort by q values");
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148 // TODO: Do this db level.
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149 // XXX: This is so ugly :-(
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150 Integer [] indices = new Integer[vs[0].length];
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151 for (int i = 0; i < indices.length; ++i) {
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152 indices[i] = i;
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153 }
329
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154
333
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155 Arrays.sort(indices, new Comparator<Integer>() {
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156 public int compare(Integer a, Integer b) {
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157 double va = vs[1][a];
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158 double vb = vs[1][b];
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159 double d = va - vb;
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160 if (d < 0.0) return -1;
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161 if (d > 0.0) return +1;
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162 return 0;
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163 }
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164 });
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165
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166 double [][] vs2 = new double[2][vs[0].length];
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167 for (int i = 0; i < indices.length; ++i) {
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168 vs2[0][i] = vs[0][indices[i]];
337
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169 vs2[1][i] = vs[1][indices[i]];
333
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170 }
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171 values.put(gaugeName, vs2);
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172 }
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173 else {
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174 values.put(gaugeName, vs);
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175 }
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176
146
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177 }
311
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178
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179 return values;
146
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180 }
329
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181
334
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182 public static double getQForW(
329
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183 double [][] values,
334
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184 double w,
333
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185 double [] result
329
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186 ) {
334
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187 int index = Arrays.binarySearch(values[0], w);
329
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188 if (index >= 0) {
334
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189 return values[0][index];
329
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190 }
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191
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192 index = -index - 1; // insert position
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193
334
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194 if (index < 1 || index >= values.length) {
329
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195 // do not extraploate
334
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196 return Double.NaN;
329
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197 }
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198
334
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199 double w1 = values[index-1][0];
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200 double w2 = values[index ][0];
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201 double q1 = values[index-1][1];
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202 double q2 = values[index ][1];
329
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203
334
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204 // q1 = m*w1 + b
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205 // q2 = m*w2 + b
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206 // q2 - q1 = m*(w2 - w1)
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207 // m = (q2 - q1)/(w2 - w1) # w2 != w1
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208 // b = q1 - m*w1
329
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209
334
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diff changeset
210 if (w1 == w2) {
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diff changeset
211 return 0.5*(q1 + q2);
329
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212 }
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213
334
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diff changeset
214 double m = (q2 - q1)/(w2 - w1);
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diff changeset
215 double b = q1 - m*w1;
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diff changeset
216 return w*m + b;
329
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217 }
146
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218 }
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219 // vim:set ts=4 sw=4 si et sta sts=4 fenc=utf8 :
http://dive4elements.wald.intevation.org