Mercurial > dive4elements > river
annotate artifacts/src/main/java/org/dive4elements/river/utils/MapfileGenerator.java @ 9801:1d7a72a50183 3.2.x tip
Assume Compose V2, consistently
author | Tom Gottfried <tom@intevation.de> |
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date | Thu, 23 Nov 2023 10:14:13 +0100 |
parents | 308a0d822d18 |
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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 |
9726 | 24 import org.apache.logging.log4j.Logger; |
25 import org.apache.logging.log4j.LogManager; | |
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26 import org.apache.velocity.Template; |
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27 import org.apache.velocity.VelocityContext; |
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28 import org.apache.velocity.app.VelocityEngine; |
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29 import org.apache.velocity.runtime.RuntimeConstants; |
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30 |
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31 /** |
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32 * This class iterates over a bunch of directories, searches for meta |
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33 * information coresponding to shapefiles and creates a mapfile which is used by |
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34 * a <i>MapServer</i>. |
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35 * |
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36 * @author <a href="mailto:ingo.weinzierl@intevation.de">Ingo Weinzierl</a> |
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37 */ |
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38 public abstract class MapfileGenerator |
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39 { |
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40 private static final String XPATH_MAPSERVER_TEMPLATES_PATH = |
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41 "/artifact-database/mapserver/templates/@path"; |
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42 |
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43 public static final String WSPLGEN_RESULT_SHAPE = "wsplgen.shp"; |
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44 public static final String WSPLGEN_LINES_SHAPE = "barrier_lines.shp"; |
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45 public static final String WSPLGEN_POLYGONS_SHAPE = "barrier_polygons.shp"; |
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46 public static final String WSPLGEN_USER_SHAPE = "user-rgd.shp"; |
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47 |
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48 public static final String WSPLGEN_LAYER_TEMPLATE = "wsplgen_layer.vm"; |
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49 public static final String SHP_LAYER_TEMPLATE = "shapefile_layer.vm"; |
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50 public static final String DB_LAYER_TEMPLATE = "db_layer.vm"; |
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51 public static final String RIVERAXIS_LAYER_TEMPLATE = "riveraxis-layer.vm"; |
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52 |
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53 public static final String MS_WSPLGEN_PREFIX = "wsplgen-"; |
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54 public static final String MS_BARRIERS_PREFIX = "barriers-"; |
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55 public static final String MS_LINE_PREFIX = "lines-"; |
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56 public static final String MS_POLYGONS_PREFIX = "polygons-"; |
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57 public static final String MS_LAYER_PREFIX = "ms_layer-"; |
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58 public static final String MS_USERSHAPE_PREFIX = "user-"; |
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59 |
9726 | 60 private static Logger log = LogManager.getLogger(MapfileGenerator.class); |
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61 |
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62 private File shapefileDirectory; |
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63 |
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64 private VelocityEngine velocityEngine; |
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65 |
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66 |
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67 protected MapfileGenerator() { |
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68 } |
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69 |
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70 |
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71 /** |
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72 * Method to check the existance of a template file. |
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73 * |
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74 * @param templateID The name of a template. |
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75 * @return true, of the template exists - otherwise false. |
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76 */ |
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77 public boolean templateExists(String templateID){ |
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78 Template template = getTemplateByName(templateID); |
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79 return template != null; |
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80 } |
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81 |
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82 |
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83 public abstract void generate() throws Exception; |
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84 |
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85 |
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86 /** |
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87 * Returns the VelocityEngine used for the template mechanism. |
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88 * |
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89 * @return the velocity engine. |
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90 */ |
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91 protected VelocityEngine getVelocityEngine() { |
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92 if (velocityEngine == null) { |
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93 velocityEngine = new VelocityEngine(); |
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94 try { |
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95 setupVelocity(velocityEngine); |
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96 } |
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97 catch (Exception e) { |
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98 log.error(e, e); |
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99 return null; |
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100 } |
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101 } |
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102 return velocityEngine; |
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103 } |
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104 |
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105 |
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106 /** |
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107 * Initialize velocity. |
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108 * |
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109 * @param engine Velocity engine. |
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110 * @throws Exception if an error occured while initializing velocity. |
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111 */ |
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112 protected void setupVelocity(VelocityEngine engine) |
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113 throws Exception |
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114 { |
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115 engine.setProperty( |
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116 "input.encoding", |
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117 "UTF-8"); |
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118 |
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119 engine.setProperty( |
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120 RuntimeConstants.RUNTIME_LOG, |
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121 getVelocityLogfile()); |
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122 |
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123 engine.setProperty( |
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124 "resource.loader", |
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125 "file"); |
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126 |
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127 engine.setProperty( |
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128 "file.resource.loader.path", |
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129 RiverUtils.getXPathString(XPATH_MAPSERVER_TEMPLATES_PATH) |
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130 ); |
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131 |
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132 engine.init(); |
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133 } |
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134 |
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135 protected abstract String getVelocityLogfile(); |
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136 |
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137 protected VelocityContext getVelocityContext() { |
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138 VelocityContext context = new VelocityContext(); |
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139 |
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140 try { |
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141 context.put("SHAPEFILEPATH", |
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142 getShapefileBaseDir().getCanonicalPath()); |
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143 context.put("CONFIGDIR", |
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144 Config.getConfigDirectory().getCanonicalPath()); |
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145 } |
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146 catch (FileNotFoundException fnfe) { |
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147 // this is bad |
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148 log.warn(fnfe, fnfe); |
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149 } |
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150 catch (IOException ioe) { |
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151 // this is also bad |
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152 log.warn(ioe, ioe); |
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153 } |
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154 |
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155 return context; |
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156 } |
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157 |
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158 |
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159 /** |
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160 * Returns a template specified by <i>model</i>. |
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161 * |
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162 * @param model The name of the template. |
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163 * @return a template. |
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164 */ |
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165 public Template getTemplateByName(String model) { |
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166 if (model.indexOf(".vm") < 0) { |
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167 model = model.concat(".vm"); |
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168 } |
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169 |
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170 try { |
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171 VelocityEngine engine = getVelocityEngine(); |
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172 if (engine == null) { |
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173 log.error("Error while fetching VelocityEngine."); |
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174 return null; |
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175 } |
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176 |
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177 return engine.getTemplate(model); |
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178 } |
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179 catch (Exception e) { |
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180 log.warn(e, e); |
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181 } |
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182 |
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183 return null; |
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184 } |
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185 |
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186 |
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187 /** |
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188 * Returns the mapfile template. |
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189 * |
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190 * @return the mapfile template. |
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191 * @throws Exception if an error occured while reading the configuration. |
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192 */ |
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193 protected Template getMapfileTemplateObj() |
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194 throws Exception |
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195 { |
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196 String mapfileName = getMapfileTemplate(); |
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197 return getTemplateByName(mapfileName); |
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198 } |
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199 |
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200 protected abstract String getMapfilePath(); |
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201 |
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202 protected abstract String getMapfileTemplate(); |
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203 |
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204 |
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205 /** |
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206 * Returns the base directory storing the shapefiles. |
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207 * |
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208 * @return the shapefile base directory. |
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209 * |
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210 * @throws FileNotFoundException if no shapefile path is found or |
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211 * configured. |
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212 */ |
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213 public File getShapefileBaseDir() |
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214 throws FileNotFoundException, IOException |
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215 { |
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216 if (shapefileDirectory == null) { |
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217 String path = RiverUtils.getXPathString( |
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218 RiverUtils.XPATH_MAPFILES_PATH); |
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219 |
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220 if (path != null) { |
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221 shapefileDirectory = new File(path); |
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222 } |
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223 |
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224 if (shapefileDirectory == null) { |
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225 throw new FileNotFoundException("No shapefile directory given"); |
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226 } |
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227 |
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228 if (!shapefileDirectory.exists()) { |
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229 shapefileDirectory.mkdirs(); |
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230 } |
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231 } |
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232 |
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233 return shapefileDirectory; |
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234 } |
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235 |
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236 |
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237 protected File[] getUserDirs() |
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238 throws FileNotFoundException, IOException |
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239 { |
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240 File baseDir = getShapefileBaseDir(); |
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241 File[] artifactDirs = baseDir.listFiles(); |
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242 |
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243 // TODO ONLY RETURN DIRECTORIES OF THE SPECIFIED USER |
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244 |
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245 return artifactDirs; |
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246 } |
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247 |
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248 |
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249 protected List<String> parseLayers(File[] dirs) { |
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250 List<String> layers = new ArrayList<String>(); |
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251 |
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252 for (File dir: dirs) { |
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253 File[] layerFiles = dir.listFiles(new FilenameFilter() { |
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254 @Override |
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255 public boolean accept(File directory, String name) { |
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256 return name.startsWith(MS_LAYER_PREFIX); |
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257 } |
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258 }); |
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259 |
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260 if (layerFiles == null) { |
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261 continue; |
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262 } |
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263 |
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264 for (File layer: layerFiles) { |
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265 try { |
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266 layers.add(layer.getCanonicalPath()); |
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267 } |
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268 catch (IOException ioe) { |
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269 log.warn(ioe, ioe); |
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270 } |
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271 } |
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272 } |
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273 |
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274 return layers; |
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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 layerFile The file that is written. |
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284 * @param tpl The Velocity template which is used to create the LAYER |
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285 * section. |
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286 */ |
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287 public void writeLayer( |
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288 LayerInfo layerInfo, |
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289 File layerFile, |
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290 Template tpl |
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291 ) |
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292 throws FileNotFoundException |
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293 { |
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294 if (log.isDebugEnabled()) { |
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295 log.debug("Write layer for:"); |
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296 log.debug(" directory/file: " + layerFile.getName()); |
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297 } |
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298 |
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299 Writer writer = null; |
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300 |
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301 try { |
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302 writer = new FileWriter(layerFile); |
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303 |
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304 VelocityContext context = getVelocityContext(); |
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305 context.put("LAYER", layerInfo); |
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306 |
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307 tpl.merge(context, writer); |
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308 } |
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309 catch (FileNotFoundException fnfe) { |
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310 log.error(fnfe, fnfe); |
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311 } |
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312 catch (IOException ioe) { |
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313 log.error(ioe, ioe); |
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314 } |
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315 catch (Exception e) { |
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316 log.error(e, e); |
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317 } |
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318 finally { |
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319 try { |
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320 if (writer != null) { |
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321 writer.close(); |
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322 } |
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323 } |
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324 catch (IOException ioe) { |
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325 log.debug(ioe, ioe); |
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326 } |
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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 * Creates a mapfile with the layer information stored in <i>layers</i>. |
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333 * |
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334 * @param layers Layer information. |
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335 */ |
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336 public void writeMapfile(List<String> layers) { |
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337 String tmpMapName = "mapfile" + new Date().getTime(); |
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338 |
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339 File mapfile = new File(getMapfilePath()); |
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340 |
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341 File tmp = null; |
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342 Writer writer = null; |
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343 |
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344 try { |
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345 tmp = new File(mapfile.getParent(), tmpMapName); |
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346 tmp.createNewFile(); |
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347 |
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348 writer = new FileWriter(tmp); |
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349 |
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350 VelocityContext context = getVelocityContext(); |
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351 context.put("LAYERS", layers); |
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352 |
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353 Template mapTemplate = getMapfileTemplateObj(); |
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354 if (mapTemplate == null) { |
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355 log.warn("No mapfile template found."); |
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356 return; |
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357 } |
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358 |
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359 mapTemplate.merge(context, writer); |
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360 |
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361 // we need to create a temporary mapfile first und rename it into |
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362 // real mapfile because we don't run into race conditions on this |
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363 // way. (iw) |
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364 tmp.renameTo(mapfile); |
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365 } |
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366 catch (FileNotFoundException fnfe) { |
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367 log.error(fnfe, fnfe); |
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368 } |
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369 catch (IOException ioe) { |
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370 log.error(ioe, ioe); |
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371 } |
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372 catch (Exception e) { |
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373 log.error(e, e); |
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374 } |
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375 finally { |
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376 try { |
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377 if (writer != null) { |
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378 writer.close(); |
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379 } |
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380 |
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381 if (tmp.exists()) { |
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382 tmp.delete(); |
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383 } |
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384 } |
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385 catch (IOException ioe) { |
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386 log.debug(ioe, ioe); |
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387 } |
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388 } |
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389 } |
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390 } |
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391 // vim:set ts=4 sw=4 si et sta sts=4 fenc=utf8 : |