Mercurial > dive4elements > river

annotate flys-artifacts/src/main/java/de/intevation/flys/exports/fixings/FixATWriter.java @ 3905:8bbb9e173297

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Cosmetics, docs. flys-artifacts/trunk@5570 c6561f87-3c4e-4783-a992-168aeb5c3f6f
author Felix Wolfsteller <felix.wolfsteller@intevation.de>
date Sat, 22 Sep 2012 09:59:21 +0000
parents 171db4d5d3cb
children
rev   line source
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1 package de.intevation.flys.exports.fixings;
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2
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3 import de.intevation.artifacts.CallMeta;
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4
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5 import de.intevation.flys.artifacts.math.fitting.Function;
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6
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7 import de.intevation.flys.artifacts.model.Parameters;
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8
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9 import de.intevation.flys.artifacts.resources.Resources;
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10
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11 import de.intevation.flys.exports.ATWriter;
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12
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13 import java.io.IOException;
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14 import java.io.PrintWriter;
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15 import java.io.Writer;
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16
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17 import java.util.Locale;
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18
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19 import org.apache.log4j.Logger;
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20
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21 /** Export Fixation Analysis Results to AT. */
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22 public class FixATWriter
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23 {
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24 /** Private logger. */
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25 private static Logger log = Logger.getLogger(FixATWriter.class);
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26
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27 public static final String I18N_HEADER_KEY =
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28 "fix.export.at.header";
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29
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30 public static final String I18N_HEADER_DEFAULT =
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31 "Exported fixings discharge curve for {0} {0}-km: {1}";
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32
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33 public static final String [] Q_MAX_COLUMN = new String [] { "max_q" };
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34
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35 private static final int MAX_ITERATIONS = 10000;
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36 private static final double EPSILON = 1e-8;
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37 private static final double MIN_Q = 1e-4;
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38
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39 protected Function function;
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40 protected Parameters parameters;
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41
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42 public FixATWriter() {
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43 }
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44
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45 public FixATWriter(Function function, Parameters parameters) {
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46 this.function = function;
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47 this.parameters = parameters;
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48 }
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49
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50 public void write(
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51 Writer writer,
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52 CallMeta meta,
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53 String river,
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54 double km
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55 )
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56 throws IOException {
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57 PrintWriter out = new PrintWriter(writer);
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58 printHeader(out, meta, river, km);
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59
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60 double [] coeffs = parameters.interpolate(
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61 "km", km, function.getParameterNames());
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62
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63 double [] qMax = parameters.interpolate(
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64 "km", km, Q_MAX_COLUMN);
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65
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66 if (coeffs == null || qMax == null) {
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67 log.debug("No data found at km " + km + ".");
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68 return;
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69 }
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70
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71 de.intevation.flys.artifacts.math.Function funcInst =
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72 function.instantiate(coeffs);
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73
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74 // Increase Q max about 5%.
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75 qMax[0] += Math.abs(qMax[0])*0.05;
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76
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77 double wMax = funcInst.value(qMax[0]);
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78
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79 if (Double.isNaN(wMax) || wMax < 0d) {
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80 log.debug("function '" + function.getName() +
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81 "' eval failed at " + wMax);
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82 return;
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83 }
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84
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85 Function inverse = function.getInverse();
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86
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87 de.intevation.flys.artifacts.math.Function invInst =
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88 inverse.instantiate(coeffs);
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89
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90 double wMin = minW(invInst, wMax, qMax[0]);
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91
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92 double wMinCM = wMin * 100d;
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93 double wMaxCM = wMax * 100d;
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94
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95 int wRow = ((int)wMinCM / 10) * 10;
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96
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97 if ((wMinCM - (int)wMinCM) > 0d) {
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98 wMinCM = (int)wMinCM + 1d;
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99 }
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100
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101 double w = wMinCM / 100.0;
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102
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103 int wcm = ((int)wMinCM) % 10;
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104
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105 if (log.isDebugEnabled()) {
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106 log.debug("wMinCM: " + wMinCM);
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107 log.debug("wMaxCM: " + wMaxCM);
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108 log.debug("wcm: " + wcm);
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109 }
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110
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111 out.printf(Locale.US, "%8d", wRow);
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112
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113 if (wcm > 0) {
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114 int rest = 10 - wcm;
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115 while (rest-- > 0) {
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116 out.print(ATWriter.EMPTY);
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117 }
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118 }
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119
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120 for (;;) {
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121 while (wcm++ < 10) {
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122 if (w > wMax) {
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123 break;
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124 }
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125 double q = invInst.value(w);
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126 if (Double.isNaN(w)) {
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127 out.print(ATWriter.EMPTY);
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128 }
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129 else {
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130 ATWriter.printQ(out, q);
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131 }
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132 w += 0.01d;
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133 }
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134 out.println();
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135 if (w > wMax) {
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136 break;
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137 }
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138 out.printf(Locale.US, "%8d", wRow += 10);
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139 wcm = 0;
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140 }
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141
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142 out.flush();
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143 }
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144
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145 protected void printHeader(
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146 PrintWriter out,
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147 CallMeta meta,
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148 String river,
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149 double km
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150 ) {
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151 out.println(Resources.format(
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152 meta,
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153 I18N_HEADER_KEY,
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154 I18N_HEADER_DEFAULT,
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155 river, km));
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156 }
3641
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157
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158 private static double minW(
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159 de.intevation.flys.artifacts.math.Function function,
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160 double maxW,
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161 double maxQ
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162 ) {
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163 double stepWidth = 10d;
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164
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165 double lastW = maxW;
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166 double lastQ = maxQ;
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167
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168 for (int i = 0; i < MAX_ITERATIONS; ++i) {
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169 double w = lastW - stepWidth;
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170 double q = function.value(w);
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171
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172 if (Double.isNaN(q) || q > lastQ || q < MIN_Q) {
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173 if (stepWidth < EPSILON) {
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174 break;
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175 }
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176 stepWidth *= 0.5d;
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177 continue;
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178 }
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179
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180 lastW = w;
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181 lastQ = q;
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182 }
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183
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184 return lastW;
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185 }
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186 }
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187 // vim:set ts=4 sw=4 si et sta sts=4 fenc=utf8 :
http://dive4elements.wald.intevation.org