Mercurial > dive4elements > river
annotate artifacts/src/main/java/org/dive4elements/river/utils/MapfileGenerator.java @ 6942:b77a1e804c0a
Slightly better name for flowvelocitymeasurementvaluefacets.
author | Felix Wolfsteller <felix.wolfsteller@intevation.de> |
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date | Thu, 29 Aug 2013 12:15:05 +0200 |
parents | af13ceeba52a |
children | 81ae2a4873f2 |
rev | line source |
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1 /* Copyright (C) 2011, 2012, 2013 by Bundesanstalt für Gewässerkunde |
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2 * Software engineering by Intevation GmbH |
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3 * |
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4 * This file is Free Software under the GNU AGPL (>=v3) |
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5 * and comes with ABSOLUTELY NO WARRANTY! Check out the |
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6 * documentation coming with Dive4Elements River for details. |
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7 */ |
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8 |
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9 package org.dive4elements.river.utils; |
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10 |
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11 import org.dive4elements.artifacts.common.utils.Config; |
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12 import org.dive4elements.river.artifacts.model.LayerInfo; |
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13 |
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14 import java.io.File; |
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15 import java.io.FileNotFoundException; |
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16 import java.io.FileWriter; |
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17 import java.io.FilenameFilter; |
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18 import java.io.IOException; |
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19 import java.io.Writer; |
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20 import java.util.ArrayList; |
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21 import java.util.Date; |
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22 import java.util.List; |
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23 |
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24 import org.apache.log4j.Logger; |
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25 import org.apache.velocity.Template; |
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26 import org.apache.velocity.VelocityContext; |
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27 import org.apache.velocity.app.VelocityEngine; |
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28 import org.apache.velocity.runtime.RuntimeConstants; |
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29 |
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30 /** |
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31 * This class iterates over a bunch of directories, searches for meta |
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32 * information coresponding to shapefiles and creates a mapfile which is used by |
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33 * a <i>MapServer</i>. |
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34 * |
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35 * @author <a href="mailto:ingo.weinzierl@intevation.de">Ingo Weinzierl</a> |
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36 */ |
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37 public abstract class MapfileGenerator |
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38 { |
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39 public static final String WSPLGEN_RESULT_SHAPE = "wsplgen.shp"; |
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40 public static final String WSPLGEN_LINES_SHAPE = "barrier_lines.shp"; |
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41 public static final String WSPLGEN_POLYGONS_SHAPE = "barrier_polygons.shp"; |
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42 public static final String WSPLGEN_USER_SHAPE = "user-rgd.shp"; |
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43 |
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44 public static final String WSPLGEN_LAYER_TEMPLATE = "wsplgen_layer.vm"; |
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45 public static final String SHP_LAYER_TEMPLATE = "shapefile_layer.vm"; |
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46 public static final String DB_LAYER_TEMPLATE = "db_layer.vm"; |
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47 public static final String RIVERAXIS_LAYER_TEMPLATE = "riveraxis-layer.vm"; |
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48 |
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49 public static final String MS_WSPLGEN_PREFIX = "wsplgen-"; |
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50 public static final String MS_BARRIERS_PREFIX = "barriers-"; |
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51 public static final String MS_LINE_PREFIX = "lines-"; |
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52 public static final String MS_POLYGONS_PREFIX = "polygons-"; |
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53 public static final String MS_LAYER_PREFIX = "ms_layer-"; |
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54 public static final String MS_USERSHAPE_PREFIX = "user-"; |
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55 |
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56 private static Logger logger = Logger.getLogger(MapfileGenerator.class); |
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57 |
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58 private File shapefileDirectory; |
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59 |
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60 private VelocityEngine velocityEngine; |
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61 |
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62 |
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63 protected MapfileGenerator() { |
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64 } |
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65 |
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66 |
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67 /** |
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68 * Method to check the existance of a template file. |
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69 * |
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70 * @param templateID The name of a template. |
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71 * @return true, of the template exists - otherwise false. |
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72 */ |
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73 public boolean templateExists(String templateID){ |
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74 Template template = getTemplateByName(templateID); |
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75 return template != null; |
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76 } |
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77 |
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78 |
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79 public abstract void generate() throws Exception; |
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80 |
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81 |
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82 /** |
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83 * Returns the VelocityEngine used for the template mechanism. |
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84 * |
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85 * @return the velocity engine. |
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86 */ |
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87 protected VelocityEngine getVelocityEngine() { |
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88 if (velocityEngine == null) { |
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89 velocityEngine = new VelocityEngine(); |
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90 try { |
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91 setupVelocity(velocityEngine); |
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92 } |
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93 catch (Exception e) { |
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94 logger.error(e, e); |
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95 return null; |
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96 } |
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97 } |
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98 return velocityEngine; |
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99 } |
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100 |
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101 |
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102 /** |
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103 * Initialize velocity. |
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104 * |
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105 * @param engine Velocity engine. |
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106 * @throws Exception if an error occured while initializing velocity. |
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107 */ |
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108 protected void setupVelocity(VelocityEngine engine) |
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109 throws Exception |
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110 { |
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111 engine.setProperty( |
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112 "input.encoding", |
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113 "UTF-8"); |
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114 |
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115 engine.setProperty( |
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116 RuntimeConstants.RUNTIME_LOG, |
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117 getVelocityLogfile()); |
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118 |
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119 engine.setProperty( |
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120 "resource.loader", |
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121 "file"); |
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122 |
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123 engine.setProperty( |
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124 "file.resource.loader.path", |
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125 getMapserverTemplatePath()); |
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126 |
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127 engine.init(); |
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128 } |
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129 |
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130 protected abstract String getVelocityLogfile(); |
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131 |
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132 protected abstract String getMapserverTemplatePath(); |
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133 |
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134 public abstract String getMapserverUrl(); |
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135 |
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136 protected VelocityContext getVelocityContext() { |
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137 VelocityContext context = new VelocityContext(); |
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138 |
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139 try { |
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140 context.put("MAPSERVERURL", |
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141 getMapserverUrl()); |
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142 context.put("SHAPEFILEPATH", |
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143 getShapefileBaseDir().getCanonicalPath()); |
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144 context.put("CONFIGDIR", |
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145 Config.getConfigDirectory().getCanonicalPath()); |
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146 } |
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147 catch (FileNotFoundException fnfe) { |
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148 // this is bad |
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149 logger.warn(fnfe, fnfe); |
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150 } |
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151 catch (IOException ioe) { |
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152 // this is also bad |
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153 logger.warn(ioe, ioe); |
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154 } |
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155 |
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156 return context; |
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157 } |
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158 |
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159 |
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160 /** |
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161 * Returns a template specified by <i>model</i>. |
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162 * |
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163 * @param model The name of the template. |
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164 * @return a template. |
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165 */ |
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166 public Template getTemplateByName(String model) { |
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167 if (model.indexOf(".vm") < 0) { |
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168 model = model.concat(".vm"); |
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169 } |
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170 |
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171 try { |
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172 VelocityEngine engine = getVelocityEngine(); |
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173 if (engine == null) { |
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174 logger.error("Error while fetching VelocityEngine."); |
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175 return null; |
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176 } |
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177 |
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178 return engine.getTemplate(model); |
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179 } |
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180 catch (Exception e) { |
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181 logger.warn(e, e); |
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182 } |
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183 |
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184 return null; |
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185 } |
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186 |
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187 |
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188 /** |
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189 * Returns the mapfile template. |
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190 * |
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191 * @return the mapfile template. |
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192 * @throws Exception if an error occured while reading the configuration. |
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193 */ |
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194 protected Template getMapfileTemplateObj() |
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195 throws Exception |
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196 { |
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197 String mapfileName = getMapfileTemplate(); |
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198 return getTemplateByName(mapfileName); |
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199 } |
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200 |
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201 protected abstract String getMapfilePath(); |
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202 |
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203 protected abstract String getMapfileTemplate(); |
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204 |
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205 |
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206 /** |
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207 * Returns the base directory storing the shapefiles. |
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208 * |
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209 * @return the shapefile base directory. |
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210 * |
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211 * @throws FileNotFoundException if no shapefile path is found or |
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212 * configured. |
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213 */ |
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214 public File getShapefileBaseDir() |
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215 throws FileNotFoundException, IOException |
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216 { |
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217 if (shapefileDirectory == null) { |
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218 String path = RiverUtils.getXPathString( |
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219 RiverUtils.XPATH_FLOODMAP_SHAPEFILE_DIR); |
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220 |
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221 if (path != null) { |
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222 shapefileDirectory = new File(path); |
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223 } |
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224 |
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225 if (shapefileDirectory == null) { |
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226 throw new FileNotFoundException("No shapefile directory given"); |
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227 } |
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228 |
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229 if (!shapefileDirectory.exists()) { |
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230 shapefileDirectory.mkdirs(); |
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231 } |
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232 } |
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233 |
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234 return shapefileDirectory; |
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235 } |
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236 |
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237 |
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238 protected File[] getUserDirs() |
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239 throws FileNotFoundException, IOException |
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240 { |
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241 File baseDir = getShapefileBaseDir(); |
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242 File[] artifactDirs = baseDir.listFiles(); |
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243 |
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244 // TODO ONLY RETURN DIRECTORIES OF THE SPECIFIED USER |
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245 |
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246 return artifactDirs; |
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247 } |
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248 |
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249 |
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250 |
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251 protected List<String> parseLayers(File[] dirs) { |
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252 List<String> layers = new ArrayList<String>(); |
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253 |
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254 for (File dir: dirs) { |
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255 File[] layerFiles = dir.listFiles(new FilenameFilter() { |
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256 @Override |
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257 public boolean accept(File directory, String name) { |
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258 return name.startsWith(MS_LAYER_PREFIX); |
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259 } |
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260 }); |
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261 |
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262 for (File layer: layerFiles) { |
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263 try { |
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264 layers.add(layer.getCanonicalPath()); |
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265 } |
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266 catch (IOException ioe) { |
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267 logger.warn(ioe, ioe); |
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268 } |
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269 } |
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270 } |
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271 |
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272 return layers; |
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273 } |
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274 |
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275 |
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276 |
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277 |
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278 /** |
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279 * Creates a layer snippet which might be included in the mapfile. |
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280 * |
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281 * @param layerinfo A LayerInfo object that contains all necessary |
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282 * information to build a Mapserver LAYER section. |
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283 * @param dir The base dir for the LAYER snippet. |
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284 * @param filename The name of the file that is written. |
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285 * @param tpl The Velocity template which is used to create the LAYER |
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286 * section. |
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287 */ |
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288 public void writeLayer( |
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289 LayerInfo layerInfo, |
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290 File layerFile, |
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291 Template tpl |
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292 ) |
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293 throws FileNotFoundException |
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294 { |
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295 if (logger.isDebugEnabled()) { |
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296 logger.debug("Write layer for:"); |
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297 logger.debug(" directory/file: " + layerFile.getName()); |
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298 } |
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299 |
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300 Writer writer = null; |
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301 |
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302 try { |
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303 writer = new FileWriter(layerFile); |
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304 |
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305 VelocityContext context = getVelocityContext(); |
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306 context.put("LAYER", layerInfo); |
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307 |
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308 tpl.merge(context, writer); |
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309 } |
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310 catch (FileNotFoundException fnfe) { |
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311 logger.error(fnfe, fnfe); |
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312 } |
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313 catch (IOException ioe) { |
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314 logger.error(ioe, ioe); |
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315 } |
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316 catch (Exception e) { |
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317 logger.error(e, e); |
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318 } |
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319 finally { |
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320 try { |
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321 if (writer != null) { |
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322 writer.close(); |
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323 } |
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324 } |
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325 catch (IOException ioe) { |
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326 logger.debug(ioe, ioe); |
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327 } |
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328 } |
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329 } |
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330 |
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331 |
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332 /** |
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333 * Creates a mapfile with the layer information stored in <i>layers</i>. |
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334 * |
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335 * @param layers Layer information. |
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336 */ |
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337 public void writeMapfile(List<String> layers) { |
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338 String tmpMapName = "mapfile" + new Date().getTime(); |
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339 |
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340 File mapfile = new File(getMapfilePath()); |
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341 |
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342 File tmp = null; |
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343 Writer writer = null; |
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344 |
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345 try { |
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346 tmp = new File(mapfile.getParent(), tmpMapName); |
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347 tmp.createNewFile(); |
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348 |
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349 writer = new FileWriter(tmp); |
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350 |
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351 VelocityContext context = getVelocityContext(); |
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352 context.put("LAYERS", layers); |
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353 |
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354 Template mapTemplate = getMapfileTemplateObj(); |
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355 if (mapTemplate == null) { |
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356 logger.warn("No mapfile template found."); |
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357 return; |
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358 } |
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359 |
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360 mapTemplate.merge(context, writer); |
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361 |
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362 // we need to create a temporary mapfile first und rename it into |
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363 // real mapfile because we don't run into race conditions on this |
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364 // way. (iw) |
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365 tmp.renameTo(mapfile); |
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366 } |
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367 catch (FileNotFoundException fnfe) { |
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368 logger.error(fnfe, fnfe); |
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369 } |
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370 catch (IOException ioe) { |
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371 logger.error(ioe, ioe); |
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372 } |
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373 catch (Exception e) { |
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374 logger.error(e, e); |
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375 } |
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376 finally { |
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377 try { |
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378 if (writer != null) { |
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379 writer.close(); |
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380 } |
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381 |
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382 if (tmp.exists()) { |
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383 tmp.delete(); |
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384 } |
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Introduced a MapfileGenerator that creates Mapserver specific mapfiles based on WSPLGEN results read from filesystem.
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385 } |
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Introduced a MapfileGenerator that creates Mapserver specific mapfiles based on WSPLGEN results read from filesystem.
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386 catch (IOException ioe) { |
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387 logger.debug(ioe, ioe); |
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Introduced a MapfileGenerator that creates Mapserver specific mapfiles based on WSPLGEN results read from filesystem.
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388 } |
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389 } |
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390 } |
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391 } |
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392 // vim:set ts=4 sw=4 si et sta sts=4 fenc=utf8 : |