Mercurial > dive4elements > river

annotate flys-artifacts/src/main/java/de/intevation/flys/exports/ATWriter.java @ 1999:02ce03329ef5

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Some optimizations during out() operation of FLYSArtifactCollection. flys-artifacts/trunk@3437 c6561f87-3c4e-4783-a992-168aeb5c3f6f
author Ingo Weinzierl <ingo.weinzierl@intevation.de>
date Fri, 16 Dec 2011 11:47:57 +0000
parents 394b7ac58fc9
children 0c8a6145098b
rev   line source
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1 package de.intevation.flys.exports;
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2
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3 import java.io.IOException;
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4 import java.io.Writer;
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5 import java.io.PrintWriter;
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6
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7 import java.util.Locale;
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8
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9 import de.intevation.artifacts.CallMeta;
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10
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11 import de.intevation.flys.artifacts.model.WQ;
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12 import de.intevation.flys.artifacts.resources.Resources;
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14 import org.apache.commons.math.analysis.UnivariateRealFunction;
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16 import org.apache.commons.math.analysis.interpolation.SplineInterpolator;
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17 import org.apache.commons.math.analysis.interpolation.LinearInterpolator;
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19 import org.apache.commons.math.analysis.polynomials.PolynomialFunction;
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20
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21 import org.apache.commons.math.FunctionEvaluationException;
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22
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23 import org.apache.log4j.Logger;
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24
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25 public class ATWriter
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26 {
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27 private static Logger logger = Logger.getLogger(ATWriter.class);
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28
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29 public static final int COLUMNS = 10;
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30
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31 public static final String I18N_AT_HEADER =
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32 "export.discharge.curve.at.header";
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33
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34 public static final String EMPTY = " ";
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35
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36 protected double minW;
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37 protected double maxW;
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38 protected double minQ;
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39 protected double maxQ;
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41 protected UnivariateRealFunction qFunc;
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42
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43 public ATWriter() {
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44 }
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45
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46 public ATWriter(WQ wq) throws IllegalArgumentException {
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47
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48 int [] bounds = wq.longestIncreasingWRangeIndices();
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49
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50 if (logger.isDebugEnabled()) {
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51 logger.debug("exporting w between indices " +
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52 bounds[0] + " and " + bounds[1] + " (" +
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53 wq.getW(bounds[0]) + ", " + wq.getW(bounds[1]));
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54 }
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55
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56 if (bounds[1]-bounds[0] < 1) { // Only first w can be written out.
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57 minW = maxW = wq.getW(bounds[0]);
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58 minQ = maxQ = wq.getQ(bounds[0]);
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59 // constant function
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60 qFunc = new PolynomialFunction(new double [] { minQ });
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61 return;
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62 }
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63
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64 double [] ws = new double[bounds[1]-bounds[0]];
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65 double [] qs = new double[ws.length];
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66
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67 for (int i = 0; i < ws.length; ++i) {
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68 int idx = bounds[0]+i;
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69 ws[i] = wq.getW(idx);
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70 qs[i] = wq.getQ(idx);
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71 }
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72
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73 qFunc = ws.length < 3
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74 ? new LinearInterpolator().interpolate(ws, qs)
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75 : new SplineInterpolator().interpolate(ws, qs);
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76
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77 minW = wq.getW(bounds[0]);
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78 maxW = wq.getW(bounds[1]);
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79 minQ = wq.getQ(bounds[0]);
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80 maxQ = wq.getQ(bounds[1]);
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81 }
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82
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83 public double getQ(double w) {
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84
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85 try {
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86 return qFunc.value(w);
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87 }
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88 catch (FunctionEvaluationException aode) {
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89 // should not happen
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90 logger.warn("spline interpolation failed", aode);
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91 return w <= minW ? minQ : maxQ;
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92 }
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93 }
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94
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95 protected static void printQ(PrintWriter out, double q) {
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96 String format;
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97 if (q < 1d) format = " % 8.3f";
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98 else if (q < 10d) format = " % 8.2f";
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99 else if (q < 100d) format = " % 8.1f";
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100 else {
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101 format = " % 8.0f";
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102 if (q > 1000d) q = Math.rint(q/10d)*10d;
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103 }
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104 out.printf(Locale.US, format, q);
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105 }
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106
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107
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108 protected static void printHeader(
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109 PrintWriter out,
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110 CallMeta callMeta,
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111 String river,
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112 double km
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113 ) {
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114 out.println(Resources.getMsg(
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115 callMeta,
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116 I18N_AT_HEADER,
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117 I18N_AT_HEADER,
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118 new Object[] { river, km } ));
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119 }
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120
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121
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122 public void write(Writer writer, CallMeta meta, String river, double km)
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123 throws IOException
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124 {
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125 PrintWriter out = new PrintWriter(writer);
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126
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127 // a header is required, because the desktop version of FLYS will skip
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128 // the first row.
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129 printHeader(out, meta, river, km);
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130
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131 double rest = (minW * 100.0) % 10.0;
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132
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133 double startW = Math.rint((minW - rest*0.01)*10.0)*0.1;
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134
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135 if (logger.isDebugEnabled()) {
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136 logger.debug("startW: " + startW);
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137 logger.debug("rest: " + rest);
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138 }
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139
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140 int col = 0;
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141 for (double w = startW; w <= maxW; w += 0.01) {
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142 if (col == 0) {
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143 out.printf(Locale.US, "%8d", (int)Math.round(w*100.0));
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144 }
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145
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146 if (w < minW) {
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147 out.print(EMPTY);
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148 }
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149 else {
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150 printQ(out, getQ(w));
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151 }
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152
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153 if (++col >= COLUMNS) {
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154 out.println();
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155 col = 0;
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156 }
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157 }
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158
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159 if (col > 0) {
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160 out.println();
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161 }
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162
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163 out.flush();
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164 }
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165 }
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166 // vim:set ts=4 sw=4 si et sta sts=4 fenc=utf8 :
http://dive4elements.wald.intevation.org