Mercurial > dive4elements > river

annotate flys-artifacts/src/main/java/de/intevation/flys/exports/ATWriter.java @ 5649:066f3a2f34d6

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Minor refactoring.
author Felix Wolfsteller <felix.wolfsteller@intevation.de>
date Wed, 10 Apr 2013 13:11:45 +0200
parents a929d9a9fa1e
children
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 import java.math.BigDecimal;
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7
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8 import java.text.DateFormat;
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9 import java.util.Date;
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10 import java.util.Locale;
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11
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12 import de.intevation.artifacts.CallMeta;
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13
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14 import de.intevation.flys.artifacts.model.WQ;
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15 import de.intevation.flys.artifacts.resources.Resources;
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16
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17 import org.apache.commons.math.analysis.UnivariateRealFunction;
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19 import org.apache.commons.math.analysis.interpolation.SplineInterpolator;
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20 import org.apache.commons.math.analysis.interpolation.LinearInterpolator;
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22 import org.apache.commons.math.analysis.polynomials.PolynomialFunction;
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23
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24 import org.apache.commons.math.FunctionEvaluationException;
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25
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26 import org.apache.log4j.Logger;
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27
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28 /** Write AT files. */
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29 public class ATWriter
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30 {
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31 private static Logger logger = Logger.getLogger(ATWriter.class);
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32
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33 public static final int COLUMNS = 10;
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34
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35 public static final String I18N_AT_HEADER =
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36 "export.discharge.curve.at.header";
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37
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38 public static final String I18N_AT_GAUGE_HEADER =
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39 "export.discharge.curve.at.gauge.header";
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40
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41 public static final String EMPTY = " ";
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42
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43 protected double minW;
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44 protected double maxW;
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45 protected double minQ;
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46 protected double maxQ;
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47
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48 protected UnivariateRealFunction qFunc;
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50 public ATWriter() {
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51 }
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52
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53 public ATWriter(WQ wq) throws IllegalArgumentException {
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54
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55 int [] bounds = wq.longestIncreasingWRangeIndices();
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56
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57 if (logger.isDebugEnabled()) {
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58 logger.debug("exporting w between indices " +
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59 bounds[0] + " and " + bounds[1] + " (" +
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60 wq.getW(bounds[0]) + ", " + wq.getW(bounds[1]));
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61 }
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62
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63 if (bounds[1]-bounds[0] < 1) { // Only first w can be written out.
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64 minW = maxW = wq.getW(bounds[0]);
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65 minQ = maxQ = wq.getQ(bounds[0]);
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66 // constant function
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67 qFunc = new PolynomialFunction(new double [] { minQ });
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68 return;
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69 }
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70
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71 double [] ws = new double[bounds[1]-bounds[0]];
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72 double [] qs = new double[ws.length];
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73
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74 for (int i = 0; i < ws.length; ++i) {
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75 int idx = bounds[0]+i;
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76 ws[i] = wq.getW(idx);
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77 qs[i] = wq.getQ(idx);
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78 }
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79
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80 qFunc = ws.length < 3
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81 ? new LinearInterpolator().interpolate(ws, qs)
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82 : new SplineInterpolator().interpolate(ws, qs);
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83
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84 minW = wq.getW(bounds[0]);
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85 maxW = wq.getW(bounds[1]);
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86 minQ = wq.getQ(bounds[0]);
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87 maxQ = wq.getQ(bounds[1]);
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88 }
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89
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90 public double getQ(double w) {
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91
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92 try {
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93 return qFunc.value(w);
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94 }
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95 catch (FunctionEvaluationException aode) {
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96 // should not happen
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97 logger.warn("spline interpolation failed", aode);
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98 return w <= minW ? minQ : maxQ;
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99 }
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100 }
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101
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102 public static void printQ(PrintWriter out, double q) {
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103 String format;
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104 if (q < 1d) format = " % 8.3f";
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105 else if (q < 10d) format = " % 8.2f";
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106 else if (q < 100d) format = " % 8.1f";
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107 else {
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108 format = " % 8.0f";
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109 if (q > 1000d) q = Math.rint(q/10d)*10d;
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110 }
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111 out.printf(Locale.US, format, q);
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112 }
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113
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114
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115 protected static void printGaugeHeader(
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116 PrintWriter out,
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117 CallMeta callMeta,
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118 String river,
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119 double km,
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120 String gName,
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121 BigDecimal datum,
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122 Date date
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123 ) {
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124 DateFormat f = DateFormat.getDateInstance();
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125 out.print(Resources.getMsg(
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126 callMeta,
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127 I18N_AT_GAUGE_HEADER,
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128 I18N_AT_GAUGE_HEADER,
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129 new Object[] { river, gName, f.format(date), datum } ));
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130 out.print("\r\n");
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131 }
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132
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133 protected static void printHeader(
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134 PrintWriter out,
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135 CallMeta callMeta,
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136 String river,
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137 double km
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138 ) {
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139 out.print(Resources.getMsg(
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140 callMeta,
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141 I18N_AT_HEADER,
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142 I18N_AT_HEADER,
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143 new Object[] { river, km } ));
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144 out.print("\r\n");
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145 }
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146
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147 public void write(
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148 Writer writer,
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149 CallMeta meta,
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150 String river,
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151 double km,
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152 String gName,
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153 BigDecimal datum,
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154 Date date,
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155 double scale)
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156 throws IOException
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157 {
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158 PrintWriter out = new PrintWriter(writer);
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159
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160 // A header is required, because the desktop version of FLYS will skip
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161 // the first row.
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162 if (gName != null) {
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163 printGaugeHeader(out, meta, river, km, gName, datum, date);
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164 }
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165 else {
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166 printHeader(out, meta, river, km);
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167 }
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168
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169 double rest = (minW * 100.0) % 10.0;
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170
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171 double startW = Math.rint((minW - rest*0.01)*10.0)*0.1;
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172
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173 if (logger.isDebugEnabled()) {
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174 logger.debug("startW: " + startW);
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175 logger.debug("rest: " + rest);
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176 }
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177
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178 int col = 0;
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179 for (double w = startW; w <= maxW; w += 0.01) {
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180 if (col == 0) {
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181 out.printf(Locale.US, "%8d", (int)Math.round(w * scale));
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182 }
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183
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184 if (w < minW) {
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185 out.print(EMPTY);
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186 }
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187 else {
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188 printQ(out, getQ(w));
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189 }
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190
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191 if (++col >= COLUMNS) {
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192 out.print("\r\n");
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193 col = 0;
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194 }
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195 }
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196
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197 if (col > 0) {
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198 out.print("\r\n");
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199 }
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200
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201 out.flush();
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202 }
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203 }
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204 // vim:set ts=4 sw=4 si et sta sts=4 fenc=utf8 :
http://dive4elements.wald.intevation.org