annotate flys-artifacts/src/main/java/de/intevation/flys/exports/ATWriter.java @ 1634:cc47828a1390

Added documentation. flys-artifacts/trunk@2813 c6561f87-3c4e-4783-a992-168aeb5c3f6f
author Felix Wolfsteller <felix.wolfsteller@intevation.de>
date Fri, 23 Sep 2011 04:21:16 +0000
parents 821aaceb2776
children 7d11ad5a52d5
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.flys.artifacts.model.WQ;
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11 import org.apache.commons.math.analysis.UnivariateRealFunction;
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13 import org.apache.commons.math.analysis.interpolation.SplineInterpolator;
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14 import org.apache.commons.math.analysis.interpolation.LinearInterpolator;
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16 import org.apache.commons.math.analysis.polynomials.PolynomialFunction;
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17
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18 import org.apache.commons.math.FunctionEvaluationException;
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19
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20 import org.apache.log4j.Logger;
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21
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22 public class ATWriter
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23 {
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24 private static Logger logger = Logger.getLogger(ATWriter.class);
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25
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26 public static final int COLUMNS = 10;
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27
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28 public static final String EMPTY = " ";
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29
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30 protected double minW;
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31 protected double maxW;
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32 protected double minQ;
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33 protected double maxQ;
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35 protected UnivariateRealFunction qFunc;
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36
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37 public ATWriter() {
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38 }
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39
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40 public ATWriter(WQ wq) throws IllegalArgumentException {
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41
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42 int [] bounds = wq.longestIncreasingWRangeIndices();
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43
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44 if (logger.isDebugEnabled()) {
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45 logger.debug("exporting w between indices " +
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46 bounds[0] + " and " + bounds[1] + " (" +
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47 wq.getW(bounds[0]) + ", " + wq.getW(bounds[1]));
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48 }
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49
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50 if (bounds[1]-bounds[0] < 1) { // Only first w can be written out.
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51 minW = maxW = wq.getW(bounds[0]);
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52 minQ = maxQ = wq.getQ(bounds[0]);
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53 // constant function
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54 qFunc = new PolynomialFunction(new double [] { minQ });
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55 return;
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56 }
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57
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58 double [] ws = new double[bounds[1]-bounds[0]];
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59 double [] qs = new double[ws.length];
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60
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61 for (int i = 0; i < ws.length; ++i) {
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62 int idx = bounds[0]+i;
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63 ws[i] = wq.getW(idx);
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64 qs[i] = wq.getQ(idx);
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65 }
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66
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67 qFunc = ws.length < 3
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68 ? new LinearInterpolator().interpolate(ws, qs)
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69 : new SplineInterpolator().interpolate(ws, qs);
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71 minW = wq.getW(bounds[0]);
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72 maxW = wq.getW(bounds[1]);
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73 minQ = wq.getQ(bounds[0]);
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74 maxQ = wq.getQ(bounds[1]);
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75 }
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76
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77 public double getQ(double w) {
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78
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79 try {
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80 return qFunc.value(w);
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81 }
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82 catch (FunctionEvaluationException aode) {
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83 // should not happen
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84 logger.warn("spline interpolation failed", aode);
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85 return w <= minW ? minQ : maxQ;
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86 }
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87 }
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88
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89 protected static void printQ(PrintWriter out, double q) {
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90 String format;
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91 if (q < 1d) format = " % 8.3f";
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92 else if (q < 10d) format = " % 8.2f";
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93 else if (q < 100d) format = " % 8.1f";
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94 else {
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95 format = " % 8.0f";
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96 if (q > 1000d) q = Math.rint(q/10d)*10d;
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97 }
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98 out.printf(Locale.US, format, q);
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99 }
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100
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101 public void write(Writer writer) throws IOException {
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102
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103 PrintWriter out = new PrintWriter(writer);
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104
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105 double rest = Math.abs(minW % COLUMNS);
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106
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107 double startW = Math.round(minW*10.0)/10.0;
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108 if (rest >= 1d) {
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109 startW -= 0.1;
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110 out.printf(Locale.US, "%8d", (int)Math.round(startW*100.0));
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111 int columns = (int)Math.floor(rest);
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112 for (int i = columns; i < COLUMNS; ++i) {
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113 out.print(EMPTY);
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114 }
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115 for (int i = COLUMNS-columns; i < COLUMNS; ++i) {
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116 printQ(out, getQ(startW + i*0.01));
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117 }
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118 out.println();
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119 startW += 0.1;
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120 }
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121
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122 int col = 0;
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123 for (double w = startW; w <= maxW; w += 0.01) {
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124 if (col == 0) {
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125 out.printf(Locale.US, "%8d", (int)Math.round(w*100.0));
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126 }
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127
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128 printQ(out, getQ(w));
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129
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Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents:
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130 if (++col >= COLUMNS) {
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Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents:
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131 out.println();
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Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents:
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132 col = 0;
078934923acb New AT writer for results.
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents:
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133 }
078934923acb New AT writer for results.
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents:
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134 }
078934923acb New AT writer for results.
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents:
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135
078934923acb New AT writer for results.
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents:
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136 if (col > 0) {
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Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents:
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137 out.println();
078934923acb New AT writer for results.
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents:
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138 }
078934923acb New AT writer for results.
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents:
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139
078934923acb New AT writer for results.
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents:
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140 out.flush();
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Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents:
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141 }
078934923acb New AT writer for results.
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents:
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142 }
078934923acb New AT writer for results.
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents:
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143 // vim:set ts=4 sw=4 si et sta sts=4 fenc=utf8 :

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