Mercurial > dive4elements > river
annotate artifacts/src/main/java/org/dive4elements/river/utils/MapfileGenerator.java @ 9726:0a5239a1e46e 3.2.x
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author | Tom Gottfried <tom@intevation.de> |
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date | Wed, 02 Mar 2022 10:26:50 +0100 |
parents | e9d912c97fa8 |
children | afad1fac70fb |
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 public static final String WSPLGEN_RESULT_SHAPE = "wsplgen.shp"; |
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41 public static final String WSPLGEN_LINES_SHAPE = "barrier_lines.shp"; |
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42 public static final String WSPLGEN_POLYGONS_SHAPE = "barrier_polygons.shp"; |
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43 public static final String WSPLGEN_USER_SHAPE = "user-rgd.shp"; |
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44 |
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45 public static final String WSPLGEN_LAYER_TEMPLATE = "wsplgen_layer.vm"; |
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46 public static final String SHP_LAYER_TEMPLATE = "shapefile_layer.vm"; |
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47 public static final String DB_LAYER_TEMPLATE = "db_layer.vm"; |
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48 public static final String RIVERAXIS_LAYER_TEMPLATE = "riveraxis-layer.vm"; |
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49 |
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50 public static final String MS_WSPLGEN_PREFIX = "wsplgen-"; |
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51 public static final String MS_BARRIERS_PREFIX = "barriers-"; |
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52 public static final String MS_LINE_PREFIX = "lines-"; |
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53 public static final String MS_POLYGONS_PREFIX = "polygons-"; |
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54 public static final String MS_LAYER_PREFIX = "ms_layer-"; |
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55 public static final String MS_USERSHAPE_PREFIX = "user-"; |
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56 |
9726 | 57 private static Logger log = LogManager.getLogger(MapfileGenerator.class); |
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58 |
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59 private File shapefileDirectory; |
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60 |
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61 private VelocityEngine velocityEngine; |
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62 |
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63 |
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64 protected MapfileGenerator() { |
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65 } |
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66 |
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67 |
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68 /** |
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69 * Method to check the existance of a template file. |
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70 * |
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71 * @param templateID The name of a template. |
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72 * @return true, of the template exists - otherwise false. |
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73 */ |
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74 public boolean templateExists(String templateID){ |
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75 Template template = getTemplateByName(templateID); |
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76 return template != null; |
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77 } |
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78 |
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79 |
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80 public abstract void generate() throws Exception; |
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81 |
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82 |
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83 /** |
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84 * Returns the VelocityEngine used for the template mechanism. |
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85 * |
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86 * @return the velocity engine. |
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87 */ |
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88 protected VelocityEngine getVelocityEngine() { |
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89 if (velocityEngine == null) { |
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90 velocityEngine = new VelocityEngine(); |
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91 try { |
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92 setupVelocity(velocityEngine); |
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93 } |
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94 catch (Exception e) { |
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95 log.error(e, e); |
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96 return null; |
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97 } |
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98 } |
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99 return velocityEngine; |
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100 } |
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101 |
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102 |
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103 /** |
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104 * Initialize velocity. |
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105 * |
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106 * @param engine Velocity engine. |
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107 * @throws Exception if an error occured while initializing velocity. |
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108 */ |
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109 protected void setupVelocity(VelocityEngine engine) |
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110 throws Exception |
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111 { |
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112 engine.setProperty( |
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113 "input.encoding", |
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114 "UTF-8"); |
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115 |
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116 engine.setProperty( |
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117 RuntimeConstants.RUNTIME_LOG, |
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118 getVelocityLogfile()); |
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119 |
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120 engine.setProperty( |
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121 "resource.loader", |
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122 "file"); |
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123 |
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124 engine.setProperty( |
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125 "file.resource.loader.path", |
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126 getMapserverTemplatePath()); |
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127 |
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128 engine.init(); |
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129 } |
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130 |
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131 protected abstract String getVelocityLogfile(); |
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132 |
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133 protected abstract String getMapserverTemplatePath(); |
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134 |
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135 public abstract String getMapserverUrl(); |
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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("MAPSERVERURL", |
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142 getMapserverUrl()); |
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143 context.put("SHAPEFILEPATH", |
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144 getShapefileBaseDir().getCanonicalPath()); |
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145 context.put("CONFIGDIR", |
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146 Config.getConfigDirectory().getCanonicalPath()); |
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147 } |
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148 catch (FileNotFoundException fnfe) { |
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149 // this is bad |
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150 log.warn(fnfe, fnfe); |
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151 } |
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152 catch (IOException ioe) { |
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153 // this is also bad |
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154 log.warn(ioe, ioe); |
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155 } |
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156 |
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157 return context; |
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158 } |
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159 |
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160 |
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161 /** |
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162 * Returns a template specified by <i>model</i>. |
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163 * |
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164 * @param model The name of the template. |
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165 * @return a template. |
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166 */ |
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167 public Template getTemplateByName(String model) { |
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168 if (model.indexOf(".vm") < 0) { |
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169 model = model.concat(".vm"); |
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170 } |
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171 |
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172 try { |
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173 VelocityEngine engine = getVelocityEngine(); |
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174 if (engine == null) { |
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175 log.error("Error while fetching VelocityEngine."); |
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176 return null; |
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177 } |
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178 |
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179 return engine.getTemplate(model); |
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180 } |
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181 catch (Exception e) { |
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182 log.warn(e, e); |
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183 } |
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184 |
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185 return null; |
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186 } |
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187 |
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188 |
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189 /** |
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190 * Returns the mapfile template. |
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191 * |
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192 * @return the mapfile template. |
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193 * @throws Exception if an error occured while reading the configuration. |
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194 */ |
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195 protected Template getMapfileTemplateObj() |
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196 throws Exception |
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197 { |
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198 String mapfileName = getMapfileTemplate(); |
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199 return getTemplateByName(mapfileName); |
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200 } |
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201 |
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202 protected abstract String getMapfilePath(); |
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203 |
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204 protected abstract String getMapfileTemplate(); |
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205 |
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206 |
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207 /** |
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208 * Returns the base directory storing the shapefiles. |
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209 * |
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210 * @return the shapefile base directory. |
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211 * |
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212 * @throws FileNotFoundException if no shapefile path is found or |
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213 * configured. |
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214 */ |
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215 public File getShapefileBaseDir() |
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216 throws FileNotFoundException, IOException |
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217 { |
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218 if (shapefileDirectory == null) { |
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219 String path = RiverUtils.getXPathString( |
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220 RiverUtils.XPATH_FLOODMAP_SHAPEFILE_DIR); |
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221 |
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222 if (path != null) { |
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223 shapefileDirectory = new File(path); |
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224 } |
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225 |
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226 if (shapefileDirectory == null) { |
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227 throw new FileNotFoundException("No shapefile directory given"); |
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228 } |
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229 |
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230 if (!shapefileDirectory.exists()) { |
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231 shapefileDirectory.mkdirs(); |
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232 } |
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233 } |
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234 |
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235 return shapefileDirectory; |
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236 } |
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237 |
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238 |
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239 protected File[] getUserDirs() |
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240 throws FileNotFoundException, IOException |
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241 { |
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242 File baseDir = getShapefileBaseDir(); |
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243 File[] artifactDirs = baseDir.listFiles(); |
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244 |
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245 // TODO ONLY RETURN DIRECTORIES OF THE SPECIFIED USER |
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246 |
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247 return artifactDirs; |
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248 } |
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249 |
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250 |
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251 |
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252 protected List<String> parseLayers(File[] dirs) { |
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253 List<String> layers = new ArrayList<String>(); |
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254 |
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255 for (File dir: dirs) { |
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256 File[] layerFiles = dir.listFiles(new FilenameFilter() { |
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257 @Override |
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258 public boolean accept(File directory, String name) { |
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259 return name.startsWith(MS_LAYER_PREFIX); |
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260 } |
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261 }); |
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262 |
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263 if (layerFiles == null) { |
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264 continue; |
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265 } |
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266 |
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267 for (File layer: layerFiles) { |
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268 try { |
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269 layers.add(layer.getCanonicalPath()); |
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270 } |
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271 catch (IOException ioe) { |
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272 log.warn(ioe, ioe); |
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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 return layers; |
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278 } |
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279 |
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280 |
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281 |
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282 |
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283 /** |
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284 * Creates a layer snippet which might be included in the mapfile. |
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285 * |
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286 * @param layerInfo A LayerInfo object that contains all necessary |
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287 * information to build a Mapserver LAYER section. |
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288 * @param layerFile The file that is written. |
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289 * @param tpl The Velocity template which is used to create the LAYER |
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290 * section. |
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291 */ |
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292 public void writeLayer( |
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293 LayerInfo layerInfo, |
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294 File layerFile, |
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295 Template tpl |
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296 ) |
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297 throws FileNotFoundException |
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298 { |
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299 if (log.isDebugEnabled()) { |
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300 log.debug("Write layer for:"); |
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301 log.debug(" directory/file: " + layerFile.getName()); |
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302 } |
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303 |
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304 Writer writer = null; |
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305 |
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306 try { |
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307 writer = new FileWriter(layerFile); |
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308 |
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309 VelocityContext context = getVelocityContext(); |
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310 context.put("LAYER", layerInfo); |
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311 |
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312 tpl.merge(context, writer); |
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313 } |
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314 catch (FileNotFoundException fnfe) { |
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315 log.error(fnfe, fnfe); |
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316 } |
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317 catch (IOException ioe) { |
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318 log.error(ioe, ioe); |
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319 } |
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320 catch (Exception e) { |
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321 log.error(e, e); |
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322 } |
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323 finally { |
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324 try { |
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325 if (writer != null) { |
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326 writer.close(); |
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327 } |
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328 } |
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329 catch (IOException ioe) { |
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330 log.debug(ioe, ioe); |
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331 } |
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332 } |
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333 } |
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334 |
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335 |
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336 /** |
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337 * Creates a mapfile with the layer information stored in <i>layers</i>. |
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338 * |
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339 * @param layers Layer information. |
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340 */ |
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341 public void writeMapfile(List<String> layers) { |
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342 String tmpMapName = "mapfile" + new Date().getTime(); |
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343 |
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344 File mapfile = new File(getMapfilePath()); |
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345 |
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346 File tmp = null; |
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347 Writer writer = null; |
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348 |
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349 try { |
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350 tmp = new File(mapfile.getParent(), tmpMapName); |
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351 tmp.createNewFile(); |
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352 |
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353 writer = new FileWriter(tmp); |
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354 |
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355 VelocityContext context = getVelocityContext(); |
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356 context.put("LAYERS", layers); |
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357 |
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358 Template mapTemplate = getMapfileTemplateObj(); |
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359 if (mapTemplate == null) { |
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360 log.warn("No mapfile template found."); |
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361 return; |
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362 } |
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363 |
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364 mapTemplate.merge(context, writer); |
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365 |
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366 // we need to create a temporary mapfile first und rename it into |
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367 // real mapfile because we don't run into race conditions on this |
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368 // way. (iw) |
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369 tmp.renameTo(mapfile); |
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370 } |
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371 catch (FileNotFoundException fnfe) { |
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372 log.error(fnfe, fnfe); |
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373 } |
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374 catch (IOException ioe) { |
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375 log.error(ioe, ioe); |
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376 } |
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377 catch (Exception e) { |
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378 log.error(e, e); |
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379 } |
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380 finally { |
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381 try { |
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382 if (writer != null) { |
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383 writer.close(); |
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384 } |
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385 |
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386 if (tmp.exists()) { |
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387 tmp.delete(); |
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388 } |
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389 } |
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390 catch (IOException ioe) { |
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391 log.debug(ioe, ioe); |
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392 } |
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393 } |
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394 } |
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395 } |
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396 // vim:set ts=4 sw=4 si et sta sts=4 fenc=utf8 : |