Mercurial > dive4elements > gnv-client
annotate gnv-artifacts/src/main/java/de/intevation/gnv/utils/MapfileGenerator.java @ 623:65f09139e9b3
Fixed file handle leak when writing meta data.
gnv-artifacts/trunk@694 c6561f87-3c4e-4783-a992-168aeb5c3f6f
author | Sascha L. Teichmann <sascha.teichmann@intevation.de> |
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date | Sun, 21 Feb 2010 21:05:55 +0000 |
parents | 89aca25642d6 |
children | 6a3a1da5e680 |
rev | line source |
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621
567216b56983
Added MapfileGenerator stub and MapfileGenerator calls after writing and removing shapefiles.
Ingo Weinzierl <ingo.weinzierl@intevation.de>
parents:
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1 package de.intevation.gnv.utils; |
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parents:
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2 |
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3 import de.intevation.artifactdatabase.Config; |
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4 import de.intevation.artifactdatabase.XMLUtils; |
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5 |
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6 import de.intevation.artifacts.ArtifactNamespaceContext; |
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7 |
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8 import de.intevation.gnv.wms.LayerInfo; |
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9 |
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10 import java.io.File; |
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11 import java.io.FileNotFoundException; |
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12 import java.io.FileWriter; |
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13 import java.io.IOException; |
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14 import java.io.StringWriter; |
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15 import java.io.Writer; |
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16 |
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17 import java.util.ArrayList; |
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18 import java.util.Date; |
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19 import java.util.List; |
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20 import java.util.Properties; |
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21 |
89aca25642d6
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22 import javax.xml.xpath.XPathConstants; |
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23 |
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24 import org.apache.log4j.Logger; |
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25 |
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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 |
622
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29 import org.apache.velocity.app.VelocityEngine; |
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30 |
89aca25642d6
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31 import org.w3c.dom.Document; |
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32 import org.w3c.dom.Node; |
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33 import org.w3c.dom.NodeList; |
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34 |
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35 /** |
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36 * @author Ingo Weinzierl (ingo.weinzierl@intevation.de) |
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37 */ |
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38 public class MapfileGenerator |
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39 extends Thread |
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40 { |
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41 public static final String TEMPLATE_PATH = |
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42 "/artifact-database/map-generator/templates/path/text()"; |
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43 |
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44 public static final String TEMPLATE_MAPFILE = |
89aca25642d6
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45 "/artifact-database/map-generator/templates/maptemplate/text()"; |
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46 |
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47 public static final String MAPFILE_PATH = |
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48 "/artifact-database/map-generator/mapfile/path/text()"; |
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49 |
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50 public static final String MAPFILE_NAME = |
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51 "/artifact-database/map-generator/mapfile/name/text()"; |
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52 |
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53 public static final String SHAPEFILE_BASE_DIR = |
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54 "/artifact-database/map-generator/mapfile/shapefiles/text()"; |
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55 |
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56 public static final String META_FILE_NAME = "meta.xml"; |
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57 |
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58 public static final String XPATH_LAYER = "/art:meta/art:layer"; |
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59 public static final String XPATH_LAYER_NAME = "art:name"; |
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60 public static final String XPATH_LAYER_TYPE = "art:type"; |
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61 public static final String XPATH_LAYER_DATA = "art:data"; |
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62 public static final String XPATH_LAYER_STATUS = "art:status"; |
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63 public static final String XPATH_LAYER_MODEL = "art:model"; |
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64 |
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65 protected static final long SLEEPTIME = 10 * 1000L; // 10 seconds |
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66 |
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67 private static Logger logger = Logger.getLogger(MapfileGenerator.class); |
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68 |
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69 private static MapfileGenerator instance; |
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70 |
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71 private VelocityEngine velocityEngine; |
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72 private boolean lock[]; |
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73 |
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74 |
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75 |
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76 private MapfileGenerator() { |
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77 lock = new boolean[1]; |
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78 } |
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79 |
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80 |
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81 public static void main(String[] args) { |
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82 // TODO IMPLEMENT ME |
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83 } |
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84 |
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85 |
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86 public static synchronized MapfileGenerator getInstance() { |
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87 if (instance == null) { |
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88 instance = new MapfileGenerator(); |
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89 instance.setDaemon(true); |
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90 instance.start(); |
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91 } |
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92 |
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93 return instance; |
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94 } |
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95 |
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96 |
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97 public void update() { |
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98 synchronized (lock) { |
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99 logger.debug("update"); |
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100 lock[0] = true; |
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101 lock.notify(); |
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102 } |
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103 } |
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104 |
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105 |
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106 public void run() { |
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107 logger.debug("Start MapfileGenerator thread..."); |
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108 try { |
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109 for (;;) { |
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110 synchronized (lock) { |
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111 while (!lock[0]) { |
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112 lock.wait(SLEEPTIME); |
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113 } |
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114 lock[0] = false; |
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115 } |
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116 |
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117 logger.debug("Start sync process now..."); |
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118 generate(); |
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119 } |
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120 } |
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121 catch (InterruptedException ie) { |
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122 logger.debug("MapfileGenerator thread got an interrupt."); |
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123 } |
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124 finally { |
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125 logger.debug("THREAD END"); |
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126 } |
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127 } |
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128 |
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129 |
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130 protected void generate() { |
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131 File basedir = new File(getShapefileBaseDir()); |
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132 List layers = new ArrayList(); |
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133 searchMetaInformation(basedir, layers); |
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134 writeMapfile(layers); |
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135 } |
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136 |
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137 |
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138 protected VelocityEngine getVelocityEngine() { |
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139 if (velocityEngine == null) { |
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140 velocityEngine = new VelocityEngine(); |
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141 try { |
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142 setupVelocity(velocityEngine); |
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143 } |
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144 catch (Exception e) { |
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145 logger.error(e, e); |
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146 return null; |
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147 } |
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148 } |
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149 return velocityEngine; |
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150 } |
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151 |
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152 |
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153 protected void setupVelocity(VelocityEngine engine) |
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154 throws Exception |
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155 { |
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156 Properties ps = new Properties(); |
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157 |
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158 ps.setProperty( |
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159 "input.encoding", |
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160 "UTF-8"); |
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161 |
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162 ps.setProperty( |
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163 "resource.loader", |
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164 "class"); |
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165 |
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166 ps.setProperty( |
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167 "class.resource.loader.class", |
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168 "org.apache.velocity.runtime.resource.loader.ClasspathResourceLoader"); |
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169 |
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170 engine.init(ps); |
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171 } |
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172 |
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173 |
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174 protected String getTemplateBaseDir() { |
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175 return Config.getStringXPath(TEMPLATE_PATH); |
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176 } |
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177 |
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178 |
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179 protected Template getTemplateByName(String model) { |
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180 String templatePath = getTemplateBaseDir(); |
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181 if (model.indexOf(".vm") < 0) { |
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182 model = model.concat(".vm"); |
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183 } |
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184 |
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185 File file = new File(templatePath, model); |
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186 if (!file.exists() || !file.canRead()) { |
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187 logger.warn("Can't find template file: " + file.getAbsolutePath()); |
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188 return null; |
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189 } |
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190 |
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191 try { |
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192 VelocityEngine engine = getVelocityEngine(); |
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193 if (engine == null) { |
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194 logger.error("Error while fetching VelocityEngine."); |
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195 return null; |
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196 } |
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197 |
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198 return engine.getTemplate(file.getAbsolutePath()); |
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199 } |
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200 catch (Exception e) { |
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201 logger.warn(e, e); |
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202 } |
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203 |
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204 return null; |
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205 } |
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206 |
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207 |
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208 protected Template getMapfileTemplate() |
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209 throws Exception |
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210 { |
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211 String mapfileName = Config.getStringXPath(TEMPLATE_MAPFILE); |
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212 return getTemplateByName(mapfileName); |
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213 } |
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214 |
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215 |
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216 protected String getShapefileBaseDir() { |
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217 return Config.getStringXPath(SHAPEFILE_BASE_DIR); |
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218 } |
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219 |
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220 |
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221 protected void searchMetaInformation(File file, List store) { |
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222 if (file.isDirectory()) { |
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223 File[] files = file.listFiles(); |
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224 |
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225 if (files != null && files.length != 0) { |
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226 int size = files.length; |
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227 for (File tmp: files) { |
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228 searchMetaInformation(tmp, store); |
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229 } |
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230 } |
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231 } |
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232 else if (file.getName().equals(META_FILE_NAME)) { |
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233 LayerInfo[] info = parseMeta(file); |
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234 |
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235 int infoSize = info.length; |
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236 for (int j = 0; j < infoSize; j++) { |
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237 if (info[j] != null) { |
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238 store.add(info[j]); |
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239 } |
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240 } |
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241 } |
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242 } |
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243 |
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244 |
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245 protected LayerInfo[] parseMeta(File file) { |
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246 Document meta = XMLUtils.parseDocument(file); |
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247 List layers = new ArrayList(); |
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248 |
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249 NodeList layerset = (NodeList) XMLUtils.xpath( |
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250 meta, |
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251 XPATH_LAYER, |
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252 XPathConstants.NODESET, |
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253 ArtifactNamespaceContext.INSTANCE); |
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254 |
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255 int size = layerset.getLength(); |
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256 for (int i = 0; i < size; i++) { |
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257 LayerInfo info = parseLayer(layerset.item(i)); |
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258 |
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259 if (info != null && !info.isEmpty() && !info.isBroken()) { |
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260 layers.add(info); |
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261 } |
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262 else { |
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263 logger.warn("Found broken LayerInfo object."); |
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264 } |
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265 } |
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266 |
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267 return (LayerInfo[]) layers.toArray(new LayerInfo[layers.size()]); |
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268 } |
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269 |
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270 |
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271 protected LayerInfo parseLayer(Node layer) { |
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272 LayerInfo info = new LayerInfo(); |
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273 |
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274 String name = parseLayerAttr(layer, XPATH_LAYER_NAME); |
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275 if (name != null && !name.equals("")) { |
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276 info.setName(name); |
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277 } |
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278 |
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279 String model = parseLayerAttr(layer, XPATH_LAYER_MODEL); |
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280 if (model != null && !model.equals("")) { |
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281 info.setModel(model); |
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282 } |
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283 |
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284 String type = parseLayerAttr(layer, XPATH_LAYER_TYPE); |
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285 if (type != null && !type.equals("")) { |
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286 info.setType(type); |
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287 } |
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288 |
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289 String data = parseLayerAttr(layer, XPATH_LAYER_DATA); |
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290 if (data != null && !data.equals("")) { |
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291 info.setData(data); |
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292 } |
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293 |
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294 String status = parseLayerAttr(layer, XPATH_LAYER_STATUS); |
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295 if (status != null && !status.equals("")) { |
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296 info.setStatus(status); |
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297 } |
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298 |
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299 return info; |
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300 } |
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301 |
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302 |
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303 protected String parseLayerAttr(Node node, String xpath) { |
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304 return (String) XMLUtils.xpath( |
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305 node, |
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306 xpath, |
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307 XPathConstants.STRING, |
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308 ArtifactNamespaceContext.INSTANCE); |
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309 } |
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310 |
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311 |
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312 protected void writeMapfile(List layers) { |
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313 String pathName = Config.getStringXPath(MAPFILE_PATH); |
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314 String mapName = Config.getStringXPath(MAPFILE_NAME); |
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315 String tmpMapName = "mapfile" + new Date().getTime(); |
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316 |
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317 int layersize = layers.size(); |
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318 StringBuilder sb = new StringBuilder(); |
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319 StringWriter sw = null; |
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320 LayerInfo info = null; |
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321 |
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322 for (int i = 0; i < layersize; i++) { |
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323 sw = new StringWriter(); |
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324 info = (LayerInfo) layers.get(i); |
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325 |
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326 Template layerTemplate = getTemplateByName(info.getModel()); |
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327 VelocityContext context = new VelocityContext(); |
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328 context.put("info", info); |
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329 |
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330 try { |
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331 layerTemplate.merge(context, sw); |
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332 sb.append(sw.toString()); |
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333 } |
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334 catch (IOException ioe) { |
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335 logger.warn("Error while filling layer template."); |
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336 logger.warn(ioe, ioe); |
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337 } |
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338 } |
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339 |
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340 Writer writer = null; |
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341 File tmp = null; |
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342 File map = null; |
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343 |
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344 try { |
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345 tmp = new File(pathName, tmpMapName); |
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346 map = new File(pathName, mapName); |
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347 |
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348 tmp.createNewFile(); |
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349 writer = new FileWriter(tmp); |
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350 |
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351 VelocityContext context = new VelocityContext(); |
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352 context.put("LAYERS", sb.toString()); |
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353 |
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354 Template mapTemplate = getMapfileTemplate(); |
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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(map); |
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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 // close file writer |
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379 if (writer != null) { |
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380 writer.close(); |
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381 } |
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382 |
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383 // remove temporary mapfile if an error occured and it still |
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384 // exists |
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385 if (tmp.exists()) { |
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386 tmp.delete(); |
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387 } |
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388 } |
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389 catch (IOException ioe) { |
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390 logger.debug(ioe, ioe); |
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391 } |
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392 } |
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393 } |
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394 } |
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395 // vim:set ts=4 sw=4 si et sta sts=4 fenc=utf8: |