Mercurial > dive4elements > river

annotate flys-artifacts/src/main/java/de/intevation/flys/utils/MapfileGenerator.java @ 5771:0677aff0ff15

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Fixed typo ind i18n string.
author Raimund Renkert <rrenkert@intevation.de>
date Thu, 18 Apr 2013 15:03:13 +0200
parents b55975761708
children
rev   line source
1129
da3c3e286c88 Introduced a MapfileGenerator that creates Mapserver specific mapfiles based on WSPLGEN results read from filesystem.
Ingo Weinzierl <ingo.weinzierl@intevation.de>
parents:
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1 package de.intevation.flys.utils;
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2
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3 import de.intevation.artifacts.common.utils.Config;
96daa8a4c48f Fix and workaround NullPointerExceptions
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4 import de.intevation.flys.artifacts.model.LayerInfo;
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5
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6 import java.io.File;
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7 import java.io.FileNotFoundException;
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8 import java.io.FileWriter;
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9 import java.io.FilenameFilter;
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10 import java.io.IOException;
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11 import java.io.Writer;
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12 import java.util.ArrayList;
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13 import java.util.Date;
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14 import java.util.List;
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15
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16 import org.apache.log4j.Logger;
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17 import org.apache.velocity.Template;
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18 import org.apache.velocity.VelocityContext;
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19 import org.apache.velocity.app.VelocityEngine;
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20 import org.apache.velocity.runtime.RuntimeConstants;
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21
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22 /**
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23 * This class iterates over a bunch of directories, searches for meta
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24 * information coresponding to shapefiles and creates a mapfile which is used by
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25 * a <i>MapServer</i>.
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26 *
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27 * @author <a href="mailto:ingo.weinzierl@intevation.de">Ingo Weinzierl</a>
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28 */
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29 public abstract class MapfileGenerator
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30 {
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31 public static final String WSPLGEN_RESULT_SHAPE = "wsplgen.shp";
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32 public static final String WSPLGEN_LINES_SHAPE = "barrier_lines.shp";
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33 public static final String WSPLGEN_POLYGONS_SHAPE = "barrier_polygons.shp";
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34 public static final String WSPLGEN_USER_SHAPE = "user-rgd.shp";
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35
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36 public static final String WSPLGEN_LAYER_TEMPLATE = "wsplgen_layer.vm";
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37 public static final String SHP_LAYER_TEMPLATE = "shapefile_layer.vm";
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38 public static final String DB_LAYER_TEMPLATE = "db_layer.vm";
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39 public static final String RIVERAXIS_LAYER_TEMPLATE = "riveraxis-layer.vm";
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40
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41 public static final String MS_WSPLGEN_PREFIX = "wsplgen-";
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42 public static final String MS_BARRIERS_PREFIX = "barriers-";
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43 public static final String MS_LINE_PREFIX = "lines-";
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44 public static final String MS_POLYGONS_PREFIX = "polygons-";
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45 public static final String MS_LAYER_PREFIX = "ms_layer-";
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46 public static final String MS_USERSHAPE_PREFIX = "user-";
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47
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48 private static Logger logger = Logger.getLogger(MapfileGenerator.class);
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49
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50 private File shapefileDirectory;
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51
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52 private VelocityEngine velocityEngine;
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53
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54
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55 protected MapfileGenerator() {
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56 }
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57
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58
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59 /**
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60 * Method to check the existance of a template file.
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61 *
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62 * @param templateID The name of a template.
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63 * @return true, of the template exists - otherwise false.
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64 */
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65 public boolean templateExists(String templateID){
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66 Template template = getTemplateByName(templateID);
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67 return template != null;
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68 }
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69
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70
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71 public abstract void generate() throws Exception;
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72
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73
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74 /**
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75 * Returns the VelocityEngine used for the template mechanism.
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76 *
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77 * @return the velocity engine.
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78 */
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79 protected VelocityEngine getVelocityEngine() {
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80 if (velocityEngine == null) {
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81 velocityEngine = new VelocityEngine();
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82 try {
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83 setupVelocity(velocityEngine);
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84 }
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85 catch (Exception e) {
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86 logger.error(e, e);
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87 return null;
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88 }
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89 }
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90 return velocityEngine;
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91 }
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92
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93
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94 /**
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95 * Initialize velocity.
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96 *
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97 * @param engine Velocity engine.
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98 * @throws Exception if an error occured while initializing velocity.
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99 */
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100 protected void setupVelocity(VelocityEngine engine)
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101 throws Exception
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102 {
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103 engine.setProperty(
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104 "input.encoding",
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105 "UTF-8");
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106
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107 engine.setProperty(
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108 RuntimeConstants.RUNTIME_LOG,
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109 getVelocityLogfile());
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110
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111 engine.setProperty(
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112 "resource.loader",
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113 "file");
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114
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115 engine.setProperty(
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116 "file.resource.loader.path",
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117 getMapserverTemplatePath());
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118
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119 engine.init();
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120 }
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121
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122 protected abstract String getVelocityLogfile();
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123
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124 protected abstract String getMapserverTemplatePath();
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125
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126 public abstract String getMapserverUrl();
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127
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128 protected VelocityContext getVelocityContext() {
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129 VelocityContext context = new VelocityContext();
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130
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131 try {
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132 context.put("MAPSERVERURL",
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133 getMapserverUrl());
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134 context.put("SHAPEFILEPATH",
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135 getShapefileBaseDir().getCanonicalPath());
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136 context.put("CONFIGDIR",
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137 Config.getConfigDirectory().getCanonicalPath());
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138 }
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139 catch (FileNotFoundException fnfe) {
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140 // this is bad
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141 logger.warn(fnfe, fnfe);
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142 }
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143 catch (IOException ioe) {
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144 // this is also bad
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145 logger.warn(ioe, ioe);
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146 }
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147
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148 return context;
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149 }
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150
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151
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152 /**
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153 * Returns a template specified by <i>model</i>.
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154 *
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155 * @param model The name of the template.
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156 * @return a template.
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157 */
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158 public Template getTemplateByName(String model) {
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159 if (model.indexOf(".vm") < 0) {
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160 model = model.concat(".vm");
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161 }
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162
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163 try {
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164 VelocityEngine engine = getVelocityEngine();
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165 if (engine == null) {
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166 logger.error("Error while fetching VelocityEngine.");
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167 return null;
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168 }
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169
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170 return engine.getTemplate(model);
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171 }
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172 catch (Exception e) {
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173 logger.warn(e, e);
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174 }
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175
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176 return null;
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177 }
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178
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179
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180 /**
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181 * Returns the mapfile template.
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182 *
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183 * @return the mapfile template.
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184 * @throws Exception if an error occured while reading the configuration.
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185 */
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186 protected Template getMapfileTemplateObj()
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187 throws Exception
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188 {
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189 String mapfileName = getMapfileTemplate();
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190 return getTemplateByName(mapfileName);
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191 }
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192
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193 protected abstract String getMapfilePath();
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194
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195 protected abstract String getMapfileTemplate();
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196
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197
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198 /**
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199 * Returns the base directory storing the shapefiles.
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200 *
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201 * @return the shapefile base directory.
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202 *
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203 * @throws FileNotFoundException if no shapefile path is found or
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204 * configured.
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205 */
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206 public File getShapefileBaseDir()
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207 throws FileNotFoundException, IOException
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208 {
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209 if (shapefileDirectory == null) {
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210 String path = FLYSUtils.getXPathString(
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211 FLYSUtils.XPATH_FLOODMAP_SHAPEFILE_DIR);
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212
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213 if (path != null) {
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214 shapefileDirectory = new File(path);
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215 }
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216
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217 if (shapefileDirectory == null) {
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218 throw new FileNotFoundException("No shapefile directory given");
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219 }
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220
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221 if (!shapefileDirectory.exists()) {
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222 shapefileDirectory.mkdirs();
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223 }
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224 }
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225
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226 return shapefileDirectory;
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227 }
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228
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229
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230 protected File[] getUserDirs()
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231 throws FileNotFoundException, IOException
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232 {
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233 File baseDir = getShapefileBaseDir();
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234 File[] artifactDirs = baseDir.listFiles();
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235
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236 // TODO ONLY RETURN DIRECTORIES OF THE SPECIFIED USER
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237
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238 return artifactDirs;
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239 }
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240
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241
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242
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243 protected List<String> parseLayers(File[] dirs) {
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244 List<String> layers = new ArrayList<String>();
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245
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246 for (File dir: dirs) {
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247 File[] layerFiles = dir.listFiles(new FilenameFilter() {
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248 @Override
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249 public boolean accept(File directory, String name) {
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250 return name.startsWith(MS_LAYER_PREFIX);
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251 }
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252 });
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253
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254 for (File layer: layerFiles) {
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255 try {
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256 layers.add(layer.getCanonicalPath());
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257 }
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258 catch (IOException ioe) {
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259 logger.warn(ioe, ioe);
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260 }
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261 }
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262 }
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263
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264 return layers;
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265 }
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266
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267
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268
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269
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270 /**
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271 * Creates a layer snippet which might be included in the mapfile.
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272 *
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273 * @param layerinfo A LayerInfo object that contains all necessary
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274 * information to build a Mapserver LAYER section.
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275 * @param dir The base dir for the LAYER snippet.
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276 * @param filename The name of the file that is written.
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277 * @param tpl The Velocity template which is used to create the LAYER
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278 * section.
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279 */
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280 public void writeLayer(
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281 LayerInfo layerInfo,
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282 File layerFile,
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283 Template tpl
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284 )
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285 throws FileNotFoundException
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286 {
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287 if (logger.isDebugEnabled()) {
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288 logger.debug("Write layer for:");
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289 logger.debug(" directory/file: " + layerFile.getName());
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290 }
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291
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292 Writer writer = null;
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293
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294 try {
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295 writer = new FileWriter(layerFile);
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296
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297 VelocityContext context = getVelocityContext();
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298 context.put("LAYER", layerInfo);
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299
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300 tpl.merge(context, writer);
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301 }
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302 catch (FileNotFoundException fnfe) {
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303 logger.error(fnfe, fnfe);
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304 }
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305 catch (IOException ioe) {
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306 logger.error(ioe, ioe);
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307 }
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308 catch (Exception e) {
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309 logger.error(e, e);
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310 }
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diff changeset
311 finally {
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312 try {
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313 if (writer != null) {
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314 writer.close();
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315 }
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316 }
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317 catch (IOException ioe) {
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318 logger.debug(ioe, ioe);
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319 }
0156105222c9 Improved the MapfileGenerator. It offers methods to create barrier and wsplgen layer files for mapserver.
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320 }
0156105222c9 Improved the MapfileGenerator. It offers methods to create barrier and wsplgen layer files for mapserver.
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321 }
0156105222c9 Improved the MapfileGenerator. It offers methods to create barrier and wsplgen layer files for mapserver.
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322
0156105222c9 Improved the MapfileGenerator. It offers methods to create barrier and wsplgen layer files for mapserver.
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323
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324 /**
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325 * Creates a mapfile with the layer information stored in <i>layers</i>.
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326 *
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327 * @param layers Layer information.
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328 */
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Raimund Renkert <rrenkert@intevation.de>
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diff changeset
329 public void writeMapfile(List<String> layers) {
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330 String tmpMapName = "mapfile" + new Date().getTime();
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331
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332 File mapfile = new File(getMapfilePath());
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333
da3c3e286c88 Introduced a MapfileGenerator that creates Mapserver specific mapfiles based on WSPLGEN results read from filesystem.
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334 File tmp = null;
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335 Writer writer = null;
da3c3e286c88 Introduced a MapfileGenerator that creates Mapserver specific mapfiles based on WSPLGEN results read from filesystem.
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336
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337 try {
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338 tmp = new File(mapfile.getParent(), tmpMapName);
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339 tmp.createNewFile();
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340
da3c3e286c88 Introduced a MapfileGenerator that creates Mapserver specific mapfiles based on WSPLGEN results read from filesystem.
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341 writer = new FileWriter(tmp);
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parents:
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342
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343 VelocityContext context = getVelocityContext();
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344 context.put("LAYERS", layers);
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345
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346 Template mapTemplate = getMapfileTemplateObj();
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347 if (mapTemplate == null) {
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348 logger.warn("No mapfile template found.");
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349 return;
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350 }
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351
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352 mapTemplate.merge(context, writer);
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353
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354 // we need to create a temporary mapfile first und rename it into
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355 // real mapfile because we don't run into race conditions on this
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356 // way. (iw)
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357 tmp.renameTo(mapfile);
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358 }
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359 catch (FileNotFoundException fnfe) {
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360 logger.error(fnfe, fnfe);
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361 }
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362 catch (IOException ioe) {
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363 logger.error(ioe, ioe);
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364 }
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365 catch (Exception e) {
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366 logger.error(e, e);
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367 }
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368 finally {
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369 try {
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370 if (writer != null) {
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371 writer.close();
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372 }
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373
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374 if (tmp.exists()) {
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375 tmp.delete();
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376 }
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377 }
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378 catch (IOException ioe) {
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379 logger.debug(ioe, ioe);
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380 }
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381 }
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382 }
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383 }
da3c3e286c88 Introduced a MapfileGenerator that creates Mapserver specific mapfiles based on WSPLGEN results read from filesystem.
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384 // vim:set ts=4 sw=4 si et sta sts=4 fenc=utf8 :
http://dive4elements.wald.intevation.org