Mercurial > dive4elements > river

annotate flys-artifacts/src/main/java/de/intevation/flys/utils/MapfileGenerator.java @ 4654:861c47e0a8a0

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Refactor Mapserver mapfile generation. Prepares the existing mapfile generation code for a river axis mapfile generator. Removes unused asynchronous mapfile generation to reduce complexity.
author Christian Lins <christian.lins@intevation.de>
date Sat, 08 Dec 2012 00:19:29 +0100
parents c04db3178d09
children 442fbb290fa8
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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da3c3e286c88 Introduced a MapfileGenerator that creates Mapserver specific mapfiles based on WSPLGEN results read from filesystem.
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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
da3c3e286c88 Introduced a MapfileGenerator that creates Mapserver specific mapfiles based on WSPLGEN results read from filesystem.
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21 /**
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22 * This class iterates over a bunch of directories, searches for meta
da3c3e286c88 Introduced a MapfileGenerator that creates Mapserver specific mapfiles based on WSPLGEN results read from filesystem.
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23 * information coresponding to shapefiles and creates a mapfile which is used by
da3c3e286c88 Introduced a MapfileGenerator that creates Mapserver specific mapfiles based on WSPLGEN results read from filesystem.
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24 * a <i>MapServer</i>.
da3c3e286c88 Introduced a MapfileGenerator that creates Mapserver specific mapfiles based on WSPLGEN results read from filesystem.
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25 *
da3c3e286c88 Introduced a MapfileGenerator that creates Mapserver specific mapfiles based on WSPLGEN results read from filesystem.
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26 * @author <a href="mailto:ingo.weinzierl@intevation.de">Ingo Weinzierl</a>
da3c3e286c88 Introduced a MapfileGenerator that creates Mapserver specific mapfiles based on WSPLGEN results read from filesystem.
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27 */
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28 public abstract class MapfileGenerator
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29 {
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30 public static final String WSPLGEN_RESULT_SHAPE = "wsplgen.shp";
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31 public static final String WSPLGEN_LINES_SHAPE = "barrier_lines.shp";
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32 public static final String WSPLGEN_POLYGONS_SHAPE = "barrier_polygons.shp";
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33 public static final String WSPLGEN_USER_SHAPE = "user-rgd.shp";
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34
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35 public static final String WSPLGEN_LAYER_TEMPLATE = "wsplgen_layer.vm";
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36 public static final String SHP_LAYER_TEMPLATE = "shapefile_layer.vm";
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49ad801076e4 Enabled the MapGenerator to create WMS layers with database datastore - riveraxis is the first layer that is no longer fetched from static WMS service but from user specific one.
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37 public static final String DB_LAYER_TEMPLATE = "db_layer.vm";
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38 public static final String RIVERAXIS_LAYER_TEMPLATE = "riveraxis-layer.vm";
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39
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40 public static final String MS_WSPLGEN_PREFIX = "wsplgen-";
a78dafdd8590 Issue 657.
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41 public static final String MS_BARRIERS_PREFIX = "barriers-";
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42 public static final String MS_LINE_PREFIX = "lines-";
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43 public static final String MS_POLYGONS_PREFIX = "polygons-";
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44 public static final String MS_LAYER_PREFIX = "ms_layer-";
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45 public static final String MS_USERSHAPE_PREFIX = "user-";
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46
da3c3e286c88 Introduced a MapfileGenerator that creates Mapserver specific mapfiles based on WSPLGEN results read from filesystem.
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47 private static Logger logger = Logger.getLogger(MapfileGenerator.class);
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48
da3c3e286c88 Introduced a MapfileGenerator that creates Mapserver specific mapfiles based on WSPLGEN results read from filesystem.
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49 private File shapefileDirectory;
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50
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51 private VelocityEngine velocityEngine;
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52
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53
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54 protected MapfileGenerator() {
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55 }
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56
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57
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58 /**
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59 * Method to check the existance of a template file.
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60 *
da3c3e286c88 Introduced a MapfileGenerator that creates Mapserver specific mapfiles based on WSPLGEN results read from filesystem.
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61 * @param templateID The name of a template.
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62 * @return true, of the template exists - otherwise false.
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63 */
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64 public boolean templateExists(String templateID){
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65 Template template = getTemplateByName(templateID);
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66 return template != null;
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67 }
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68
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69
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70 protected abstract void generate() throws Exception;
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71
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72
c04db3178d09 Work on river axis mapfile generator.
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73 /**
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74 * Returns the VelocityEngine used for the template mechanism.
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75 *
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76 * @return the velocity engine.
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77 */
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78 protected VelocityEngine getVelocityEngine() {
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79 if (velocityEngine == null) {
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80 velocityEngine = new VelocityEngine();
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81 try {
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82 setupVelocity(velocityEngine);
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83 }
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84 catch (Exception e) {
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85 logger.error(e, e);
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86 return null;
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87 }
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88 }
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89 return velocityEngine;
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90 }
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91
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93 /**
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94 * Initialize velocity.
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95 *
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96 * @param engine Velocity engine.
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97 * @throws Exception if an error occured while initializing velocity.
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98 */
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99 protected void setupVelocity(VelocityEngine engine)
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100 throws Exception
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101 {
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102 engine.setProperty(
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103 "input.encoding",
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104 "UTF-8");
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105
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106 engine.setProperty(
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107 VelocityEngine.RUNTIME_LOG,
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108 FLYSUtils.getXPathString(FLYSUtils.XPATH_VELOCITY_LOGFILE));
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109
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110 engine.setProperty(
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111 "resource.loader",
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112 "file");
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113
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114 engine.setProperty(
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115 "file.resource.loader.path",
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116 FLYSUtils.getXPathString(FLYSUtils.XPATH_MAPSERVER_TEMPLATE_PATH));
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117
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118 engine.init();
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119 }
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120
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121
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122 protected VelocityContext getVelocityContext() {
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123 VelocityContext context = new VelocityContext();
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124
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125 try {
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126 context.put("MAPSERVERURL",
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127 FLYSUtils.getXPathString(FLYSUtils.XPATH_MAPSERVER_URL));
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128 context.put("SHAPEFILEPATH",
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129 getShapefileBaseDir().getCanonicalPath());
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130 context.put("CONFIGDIR",
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131 Config.getConfigDirectory().getCanonicalPath());
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132 }
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133 catch (FileNotFoundException fnfe) {
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134 // this is bad
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135 logger.warn(fnfe, fnfe);
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136 }
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137 catch (IOException ioe) {
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138 // this is also bad
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139 logger.warn(ioe, ioe);
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140 }
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141
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142 return context;
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143 }
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144
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145
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146 /**
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147 * Returns a template specified by <i>model</i>.
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148 *
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149 * @param model The name of the template.
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150 * @return a template.
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151 */
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152 protected Template getTemplateByName(String model) {
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153 if (model.indexOf(".vm") < 0) {
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154 model = model.concat(".vm");
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155 }
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156
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157 try {
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158 VelocityEngine engine = getVelocityEngine();
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159 if (engine == null) {
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160 logger.error("Error while fetching VelocityEngine.");
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161 return null;
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162 }
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163
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164 return engine.getTemplate(model);
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165 }
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166 catch (Exception e) {
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167 logger.warn(e, e);
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168 }
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169
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170 return null;
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171 }
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172
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173
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174 /**
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175 * Returns the mapfile template.
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176 *
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177 * @return the mapfile template.
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178 * @throws Exception if an error occured while reading the configuration.
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179 */
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180 protected Template getMapfileTemplate()
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181 throws Exception
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182 {
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183 String mapfileName = FLYSUtils.getXPathString(
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184 FLYSUtils.XPATH_MAPFILE_TEMPLATE);
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185
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186 return getTemplateByName(mapfileName);
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187 }
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188
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189
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190 /**
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191 * Returns the base directory storing the shapefiles.
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192 *
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193 * @return the shapefile base directory.
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194 *
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195 * @throws FileNotFoundException if no shapefile path is found or
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196 * configured.
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197 */
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198 public File getShapefileBaseDir()
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199 throws FileNotFoundException, IOException
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200 {
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201 if (shapefileDirectory == null) {
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202 String path = FLYSUtils.getXPathString(
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203 FLYSUtils.XPATH_SHAPEFILE_DIR);
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204
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205 if (path != null) {
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206 shapefileDirectory = new File(path);
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207 }
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208
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209 if (shapefileDirectory == null) {
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210 throw new FileNotFoundException("No shapefile directory given");
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211 }
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212
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213 if (!shapefileDirectory.exists()) {
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214 shapefileDirectory.mkdirs();
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215 }
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216 }
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217
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218 return shapefileDirectory;
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219 }
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220
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221
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222 protected File[] getUserDirs()
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223 throws FileNotFoundException, IOException
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224 {
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225 File baseDir = getShapefileBaseDir();
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226 File[] artifactDirs = baseDir.listFiles();
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227
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228 // TODO ONLY RETURN DIRECTORIES OF THE SPECIFIED USER
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229
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230 return artifactDirs;
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231 }
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232
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233
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234
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235 protected List<String> parseLayers(File[] dirs) {
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236 List<String> layers = new ArrayList<String>();
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237
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238 for (File dir: dirs) {
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239 File[] layerFiles = dir.listFiles(new FilenameFilter() {
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240 @Override
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241 public boolean accept(File directory, String name) {
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242 return name.startsWith(MS_LAYER_PREFIX);
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243 }
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244 });
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245
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246 for (File layer: layerFiles) {
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247 try {
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248 layers.add(layer.getCanonicalPath());
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249 }
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250 catch (IOException ioe) {
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251 logger.warn(ioe, ioe);
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252 }
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253 }
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254 }
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255
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256 return layers;
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257 }
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258
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259
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260
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261
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262 /**
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263 * Creates a layer snippet which might be included in the mapfile.
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264 *
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265 * @param layerinfo A LayerInfo object that contains all necessary
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266 * information to build a Mapserver LAYER section.
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267 * @param dir The base dir for the LAYER snippet.
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268 * @param filename The name of the file that is written.
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269 * @param tpl The Velocity template which is used to create the LAYER
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270 * section.
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271 */
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272 protected void writeLayer(
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273 LayerInfo layerinfo,
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274 File dir,
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275 String filename,
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276 Template tpl
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277 )
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278 throws FileNotFoundException
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279 {
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280 if (logger.isDebugEnabled()) {
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281 logger.debug("Write layer for:");
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282 logger.debug(" directory: " + dir.getName());
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283 logger.debug(" name: " + filename);
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284 }
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285
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286 File layer = new File(dir, filename);
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287 Writer writer = null;
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288
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289 try {
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290 writer = new FileWriter(layer);
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291
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292 VelocityContext context = getVelocityContext();
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293 context.put("LAYER", layerinfo);
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294
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295 tpl.merge(context, writer);
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296 }
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297 catch (FileNotFoundException fnfe) {
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298 logger.error(fnfe, fnfe);
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299 }
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300 catch (IOException ioe) {
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301 logger.error(ioe, ioe);
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302 }
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303 catch (Exception e) {
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304 logger.error(e, e);
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305 }
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306 finally {
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307 try {
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308 if (writer != null) {
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309 writer.close();
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310 }
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311 }
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312 catch (IOException ioe) {
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313 logger.debug(ioe, ioe);
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314 }
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315 }
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316 }
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317
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318
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319 /**
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320 * Creates a mapfile with the layer information stored in <i>layers</i>.
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321 *
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322 * @param layers Layer information.
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323 */
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324 protected void writeMapfile(List<String> layers) {
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325 String tmpMapName = "mapfile" + new Date().getTime();
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326
da3c3e286c88 Introduced a MapfileGenerator that creates Mapserver specific mapfiles based on WSPLGEN results read from filesystem.
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327 File mapfile = new File(
da3c3e286c88 Introduced a MapfileGenerator that creates Mapserver specific mapfiles based on WSPLGEN results read from filesystem.
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328 FLYSUtils.getXPathString(FLYSUtils.XPATH_MAPFILE_PATH));
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329
da3c3e286c88 Introduced a MapfileGenerator that creates Mapserver specific mapfiles based on WSPLGEN results read from filesystem.
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330 File tmp = null;
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331 Writer writer = null;
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332
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333 try {
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334 tmp = new File(mapfile.getParent(), tmpMapName);
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335 tmp.createNewFile();
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336
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337 writer = new FileWriter(tmp);
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338
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339 VelocityContext context = getVelocityContext();
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340 context.put("LAYERS", layers);
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341
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342 Template mapTemplate = getMapfileTemplate();
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343 if (mapTemplate == null) {
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344 logger.warn("No mapfile template found.");
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345 return;
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346 }
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347
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348 mapTemplate.merge(context, writer);
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349
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350 // we need to create a temporary mapfile first und rename it into
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351 // real mapfile because we don't run into race conditions on this
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352 // way. (iw)
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353 tmp.renameTo(mapfile);
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354 }
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355 catch (FileNotFoundException fnfe) {
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356 logger.error(fnfe, fnfe);
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357 }
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358 catch (IOException ioe) {
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359 logger.error(ioe, ioe);
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360 }
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361 catch (Exception e) {
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362 logger.error(e, e);
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363 }
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364 finally {
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365 try {
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366 if (writer != null) {
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367 writer.close();
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368 }
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369
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370 if (tmp.exists()) {
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371 tmp.delete();
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372 }
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373 }
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374 catch (IOException ioe) {
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375 logger.debug(ioe, ioe);
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376 }
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377 }
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378 }
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379 }
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380 // vim:set ts=4 sw=4 si et sta sts=4 fenc=utf8 :
http://dive4elements.wald.intevation.org