Mercurial > dive4elements > river

annotate flys-artifacts/src/main/java/de/intevation/flys/exports/AbstractExporter.java @ 418:e0fec407a280

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ISSUE-53 Formatted number values of CSV exports. flys-artifacts/trunk@1885 c6561f87-3c4e-4783-a992-168aeb5c3f6f
author Ingo Weinzierl <ingo.weinzierl@intevation.de>
date Tue, 10 May 2011 16:10:01 +0000
parents 340dc41a7ea3
children a7947972fdeb
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.OutputStream;
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5 import java.io.OutputStreamWriter;
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6 import java.text.NumberFormat;
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7 import java.util.Locale;
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8
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9 import org.w3c.dom.Document;
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10
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11 import org.apache.log4j.Logger;
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12
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13 import au.com.bytecode.opencsv.CSVWriter;
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14
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15 import de.intevation.artifacts.Artifact;
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16 import de.intevation.artifacts.CallContext;
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17
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340dc41a7ea3 The CSV exports will now have headers.
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18 import de.intevation.flys.artifacts.resources.Resources;
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19
391
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20
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21 /**
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22 * An abstract exporter that implements some basic methods for exporting data of
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23 * artifacts.
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24 *
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25 * @author <a href="mailto:ingo.weinzierl@intevation.de">Ingo Weinzierl</a>
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26 */
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27 public abstract class AbstractExporter implements OutGenerator {
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28
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29 /** The logger used in this exporter.*/
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30 private static Logger logger = Logger.getLogger(AbstractExporter.class);
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31
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32
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33 /** The name of the CSV facet which triggers the CSV creation.*/
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34 public static final String FACET_CSV = "csv";
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35
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36 /** The default charset for the CSV export.*/
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37 public static final String DEFAULT_CSV_CHARSET = "UTF-8";
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38
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39 /** The default separator for the CSV export.*/
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40 public static final char DEFAULT_CSV_SEPARATOR = ',';
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41
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42
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43 /** The document of the incoming out() request.*/
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44 protected Document request;
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45
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46 /** The output stream where the data should be written to.*/
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47 protected OutputStream out;
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48
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49 /** The CallContext object.*/
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50 protected CallContext context;
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51
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52 /** The selected facet.*/
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53 protected String facet;
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54
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55 /** The master artifact.*/
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56 protected Artifact master;
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57
391
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58
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59 /**
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60 * Concrete subclasses need to use this method to write their special data
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61 * objects into the CSV document.
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62 *
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63 * @param writer The CSVWriter.
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64 */
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65 protected abstract void writeCSVData(CSVWriter writer);
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66
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67
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68 /**
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69 * This method enables concrete subclasses to collected its own special
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70 * data.
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71 *
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72 * @param artifacts The artifact that stores the data that has to be
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73 * exported.
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74 */
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75 protected abstract void addData(Artifact artifact);
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76
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77
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78 public void init(Document request, OutputStream out, CallContext context) {
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79 logger.debug("AbstractExporter.init");
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80
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81 this.request = request;
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82 this.out = out;
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83 this.context = context;
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84 }
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85
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86
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87 public void setMasterArtifact(Artifact master) {
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88 this.master = master;
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89 }
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90
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91
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92 /**
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93 * This doOut() just collects the data of multiple artifacts. Therefore, it
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94 * makes use of the addData() method which enables concrete subclasses to
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95 * store its data on its own. The real output creation takes place in the
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96 * concrete generate() methods.
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97 *
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98 * @param artifact The artifact.
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99 * @param facet The facet to add - NOTE: the facet needs to fit to the first
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100 * facet inserted into this exporter. Otherwise this artifact/facet is
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101 * skipped.
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102 * @param attr The attr document.
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103 */
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104 public void doOut(Artifact artifact, String facet, Document attr) {
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105 logger.debug("AbstractExporter.doOut: " + facet);
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106
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107 if (!isFacetValid(facet)) {
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108 logger.warn("Facet '" + facet + "' not valid. No output created!");
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109 return;
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110 }
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111
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112 addData(artifact);
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113 }
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114
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115
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116 /**
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117 * Generates an export based on a specified facet.
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118 */
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119 public void generate()
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120 throws IOException
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121 {
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122 logger.debug("AbstractExporter.generate");
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123
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124 if (facet != null && facet.equals(FACET_CSV)) {
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125 generateCSV();
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126 }
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127 else {
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128 throw new IOException("invalid facet for exporter.");
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129 }
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130 }
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131
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132
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133 /**
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134 * Determines if the desired facet is valid for this exporter. If no facet
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135 * is currently set, <i>facet</i> is set.
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136 *
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137 * @param facet The desired facet.
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138 *
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139 * @return true, if <i>facet</i> is valid, otherwise false.
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140 */
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141 protected boolean isFacetValid(String facet) {
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142 logger.debug("AbstractExporter.isFacetValid");
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143
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144 if (facet == null || facet.length() == 0) {
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145 return false;
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146 }
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147 else if (this.facet == null || this.facet.length() == 0) {
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148 logger.debug("Set the facet of this export: " + facet);
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149 this.facet = facet;
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150
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151 return true;
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152 }
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153 else {
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154 return this.facet.equals(facet);
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155 }
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156 }
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157
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158
416
340dc41a7ea3 The CSV exports will now have headers.
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159
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160 protected String msg(String key, String def) {
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161 return Resources.getMsg(context.getMeta(), key, def);
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162 }
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163
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164
391
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165 /**
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166 * This method starts CSV creation. It makes use of writeCSVData() which has
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167 * to be implemented by concrete subclasses.
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168 */
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169 protected void generateCSV()
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170 throws IOException
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171 {
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172 logger.info("AbstractExporter.generateCSV");
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173
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174 CSVWriter writer = new CSVWriter(
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175 new OutputStreamWriter(
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176 out,
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177 DEFAULT_CSV_CHARSET),
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178 DEFAULT_CSV_SEPARATOR);
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179
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180 writeCSVData(writer);
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181
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182 writer.close();
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183 }
418
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184
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185
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186 protected NumberFormat getFormatter(int min, int max) {
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187 Locale locale = Resources.getLocale(context.getMeta());
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188 NumberFormat nf = NumberFormat.getInstance(locale);
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189
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190 nf.setMaximumFractionDigits(max);
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191 nf.setMinimumFractionDigits(min);
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192
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193 return nf;
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194 }
391
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195 }
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196 // vim:set ts=4 sw=4 si et sta sts=4 fenc=utf8 :
http://dive4elements.wald.intevation.org