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annotate flys-artifacts/src/main/java/de/intevation/flys/utils/MapfileGenerator.java @ 1129:da3c3e286c88

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Introduced a MapfileGenerator that creates Mapserver specific mapfiles based on WSPLGEN results read from filesystem. flys-artifacts/trunk@2644 c6561f87-3c4e-4783-a992-168aeb5c3f6f
author Ingo Weinzierl <ingo.weinzierl@intevation.de>
date Mon, 05 Sep 2011 14:04:03 +0000
parents
children bcf70a452646
rev   line source
1129
da3c3e286c88 Introduced a MapfileGenerator that creates Mapserver specific mapfiles based on WSPLGEN results read from filesystem.
Ingo Weinzierl <ingo.weinzierl@intevation.de>
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1 package de.intevation.flys.utils;
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2
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3 import java.io.File;
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4 import java.io.FileNotFoundException;
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5 import java.io.FileWriter;
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6 import java.io.IOException;
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7 import java.io.StringWriter;
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8 import java.io.Writer;
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9
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10 import java.util.ArrayList;
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11 import java.util.Date;
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12 import java.util.List;
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13
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14 import org.apache.log4j.Logger;
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15
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16 import org.apache.velocity.Template;
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17 import org.apache.velocity.VelocityContext;
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18 import org.apache.velocity.app.VelocityEngine;
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19
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20 import de.intevation.flys.artifacts.model.LayerInfo;
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21
da3c3e286c88 Introduced a MapfileGenerator that creates Mapserver specific mapfiles based on WSPLGEN results read from filesystem.
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22 /**
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23 * This class iterates over a bunch of directories, searches for meta
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24 * information coresponding to shapefiles and creates a mapfile which is used by
da3c3e286c88 Introduced a MapfileGenerator that creates Mapserver specific mapfiles based on WSPLGEN results read from filesystem.
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25 * a <i>MapServer</i>.
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26 *
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27 * @author <a href="mailto:ingo.weinzierl@intevation.de">Ingo Weinzierl</a>
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28 */
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29 public class MapfileGenerator
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30 extends Thread
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31 {
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32 public static final String WSPLGEN_RESULT_SHAPE = "wsplgen.shp";
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33
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34 protected static final long SLEEPTIME = 10 * 1000L; // 10 seconds
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35
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36 private static Logger logger = Logger.getLogger(MapfileGenerator.class);
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37
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38 private static MapfileGenerator instance;
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39
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40 private File mapfile;
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41 private File shapefileDirectory;
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42
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43 private String mapServerUrl;
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44 private String templatePath;
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45 private String velocityLogfile;
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46
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47 private VelocityEngine velocityEngine;
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48 private boolean lock[];
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49
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50
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51
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52 private MapfileGenerator() {
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53 lock = new boolean[1];
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54 }
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55
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56
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57 /**
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58 * A main method which can be used to create a mapfile without a running
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59 * artifact server.<br>
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60 * <b>NOTE:</b> This method is not implemented yet!
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61 *
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62 * @param args Arguments.
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63 */
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64 public static void main(String[] args) {
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65 throw new Error("MapfileGenerator.main() is CURRENTLY NOT IMPLEMENTED!");
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66 }
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67
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68
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69 /**
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70 * Returns the instance of this generator.
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71 *
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72 * @return the instance.
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73 */
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74 public static synchronized MapfileGenerator getInstance() {
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75 if (instance == null) {
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76 instance = new MapfileGenerator();
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77 instance.setDaemon(true);
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78 instance.start();
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79 }
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80
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81 return instance;
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82 }
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83
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84
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85 /**
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86 * Triggers the mapfile generation process.
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87 */
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88 public void update() {
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89 synchronized (lock) {
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90 logger.debug("update");
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91 lock[0] = true;
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92 lock.notify();
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93 }
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94 }
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95
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97 /**
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98 * Thread to generate a mapfile.
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99 */
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100 @Override
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101 public void run() {
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102 logger.debug("Start MapfileGenerator thread...");
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103 try {
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104 for (;;) {
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105 synchronized (lock) {
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106 while (!lock[0]) {
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107 lock.wait(SLEEPTIME);
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108 }
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109 lock[0] = false;
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110 }
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111
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112 logger.debug("Start sync process now...");
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113 generate();
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114 }
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115 }
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116 catch (InterruptedException ie) {
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117 logger.debug("MapfileGenerator thread got an interrupt.");
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118 }
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119 catch (FileNotFoundException fnfe) {
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120 logger.debug("Error while mapfile creation: " + fnfe.getMessage());
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121 }
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122 finally {
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123 logger.debug("THREAD END");
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124 }
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125 }
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126
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127 /**
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128 * Method to check the existance of a template file.
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129 *
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130 * @param templateID The name of a template.
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131 * @return true, of the template exists - otherwise false.
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132 */
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133 public boolean templateExists(String templateID){
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134 Template template = getTemplateByName(templateID);
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135 return template != null;
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136 }
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137
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138
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139 /**
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140 * Method which starts searching for meta information file and mapfile
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141 * generation.
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142 */
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143 protected void generate()
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144 throws FileNotFoundException
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145 {
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146 File[] userDirs = getUserDirs();
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147 List<LayerInfo> layers = parseLayers(userDirs);
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148
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149 logger.info("Found " + layers.size() + " layers for user mapfile.");
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150
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151 writeMapfile(layers);
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152 }
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153
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154
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155 /**
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156 * Returns the VelocityEngine used for the template mechanism.
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157 *
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158 * @return the velocity engine.
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159 */
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160 protected VelocityEngine getVelocityEngine() {
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161 if (velocityEngine == null) {
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162 velocityEngine = new VelocityEngine();
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163 try {
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164 setupVelocity(velocityEngine);
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165 }
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166 catch (Exception e) {
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167 logger.error(e, e);
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168 return null;
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169 }
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170 }
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171 return velocityEngine;
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172 }
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173
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174
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175 /**
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176 * Initialize velocity.
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177 *
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178 * @param engine Velocity engine.
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179 * @throws Exception if an error occured while initializing velocity.
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180 */
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181 protected void setupVelocity(VelocityEngine engine)
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182 throws Exception
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183 {
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184 engine.setProperty(
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185 "input.encoding",
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186 "UTF-8");
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187
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188 engine.setProperty(
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189 VelocityEngine.RUNTIME_LOG,
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190 FLYSUtils.getXPathString(FLYSUtils.XPATH_VELOCITY_LOGFILE));
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191
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192 engine.setProperty(
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193 "resource.loader",
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194 "file");
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195
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196 engine.setProperty(
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197 "file.resource.loader.path",
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198 FLYSUtils.getXPathString(FLYSUtils.XPATH_MAPSERVER_TEMPLATE_PATH));
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199
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200 engine.init();
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201 }
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202
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203
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204 /**
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205 * Returns a template specified by <i>model</i>.
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206 *
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207 * @param model The name of the template.
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208 * @return a template.
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209 */
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210 protected Template getTemplateByName(String model) {
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211 if (model.indexOf(".vm") < 0) {
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212 model = model.concat(".vm");
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213 }
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214
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215 try {
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216 VelocityEngine engine = getVelocityEngine();
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217 if (engine == null) {
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218 logger.error("Error while fetching VelocityEngine.");
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219 return null;
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220 }
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221
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222 return engine.getTemplate(model);
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223 }
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224 catch (Exception e) {
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225 logger.warn(e, e);
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226 }
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227
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228 return null;
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229 }
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230
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231
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232 /**
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233 * Returns the mapfile template.
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234 *
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235 * @return the mapfile template.
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236 * @throws Exception if an error occured while reading the configuration.
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237 */
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238 protected Template getMapfileTemplate()
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239 throws Exception
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240 {
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241 String mapfileName = FLYSUtils.getXPathString(
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242 FLYSUtils.XPATH_MAPFILE_TEMPLATE);
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243
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244 return getTemplateByName(mapfileName);
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245 }
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246
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247
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248 /**
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249 * Returns the base directory storing the shapefiles.
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250 *
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251 * @return the shapefile base directory.
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252 *
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253 * @throws FileNotFoundException if no shapefile path is found or
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254 * configured.
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255 */
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256 protected File getShapefileBaseDir()
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257 throws FileNotFoundException
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258 {
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259 if (shapefileDirectory == null) {
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260 String path = FLYSUtils.getXPathString(
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261 FLYSUtils.XPATH_SHAPEFILE_DIR);
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262
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263 if (path != null) {
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264 shapefileDirectory = new File(path);
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265 }
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266
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267 if (shapefileDirectory == null || !shapefileDirectory.exists()) {
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268 throw new FileNotFoundException("No shapefile directory given");
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269 }
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270 }
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271
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272 return shapefileDirectory;
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273 }
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274
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275
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276 protected File[] getUserDirs()
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277 throws FileNotFoundException
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278 {
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279 File baseDir = getShapefileBaseDir();
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280 File[] artifactDirs = baseDir.listFiles();
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281
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282 // TODO ONLY RETURN DIRECTORIES OF THE SPECIFIED USER
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283
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284 return artifactDirs;
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285 }
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286
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287
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288
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289 protected List<LayerInfo> parseLayers(File[] dirs) {
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290 List<LayerInfo> layers = new ArrayList<LayerInfo>();
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291
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292 for (File dir: dirs) {
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293 LayerInfo layer = parseUeskLayer(dir);
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294
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295 if (layer != null && layer.getData() != null) {
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296 layers.add(layer);
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297 }
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298 }
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299
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300 return layers;
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301 }
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302
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303
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304 protected LayerInfo parseUeskLayer(File dir) {
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305 File uesk = new File(dir, WSPLGEN_RESULT_SHAPE);
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306
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307 if (!uesk.exists() || !uesk.isFile()) {
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308 return null;
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309 }
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310
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311 return new LayerInfo(uesk, "POLYGON", dir.getName(), dir.getName());
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312 }
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313
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314
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315 protected LayerInfo parseBarriersLayers(File dir) {
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316 // TODO IMPLEMENT ME
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317
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318 return null;
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319 }
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320
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321
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322 /**
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323 * Creates a mapfile with the layer information stored in <i>layers</i>.
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324 *
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325 * @param layers Layer information.
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326 */
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327 protected void writeMapfile(List<LayerInfo> layers) {
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328 String tmpMapName = "mapfile" + new Date().getTime();
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329
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330 File mapfile = new File(
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331 FLYSUtils.getXPathString(FLYSUtils.XPATH_MAPFILE_PATH));
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332
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333 File tmp = null;
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334 Writer writer = null;
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335
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336 try {
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337 tmp = new File(mapfile.getParent(), tmpMapName);
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338 tmp.createNewFile();
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339
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340 writer = new FileWriter(tmp);
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341
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342 VelocityContext context = new VelocityContext();
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343 context.put("MAPSERVERURL",
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344 FLYSUtils.getXPathString(FLYSUtils.XPATH_MAPSERVER_URL));
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345 context.put("SHAPEFILEPATH",
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346 FLYSUtils.getXPathString(FLYSUtils.XPATH_SHAPEFILE_DIR));
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347 context.put("LAYERS", fillLayerTemplates(layers));
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348
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349 Template mapTemplate = getMapfileTemplate();
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350 if (mapTemplate == null) {
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351 logger.warn("No mapfile template found.");
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352 return;
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353 }
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354
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355 mapTemplate.merge(context, writer);
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356
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357 // we need to create a temporary mapfile first und rename it into
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358 // real mapfile because we don't run into race conditions on this
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359 // way. (iw)
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360 tmp.renameTo(mapfile);
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361 }
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362 catch (FileNotFoundException fnfe) {
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363 logger.error(fnfe, fnfe);
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364 }
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365 catch (IOException ioe) {
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366 logger.error(ioe, ioe);
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367 }
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368 catch (Exception e) {
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369 logger.error(e, e);
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370 }
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371 finally {
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372 try {
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373 if (writer != null) {
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374 writer.close();
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375 }
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376
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377 if (tmp.exists()) {
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378 tmp.delete();
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379 }
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380 }
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381 catch (IOException ioe) {
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382 logger.debug(ioe, ioe);
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383 }
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384 }
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385 }
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386
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387
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388 protected List<String> fillLayerTemplates(List<LayerInfo> layers) {
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389 List<String> evaluated = new ArrayList<String>(layers.size());
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390
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391 for (LayerInfo layer: layers) {
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392 StringWriter writer = new StringWriter();
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393
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394 VelocityContext context = new VelocityContext();
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395 context.put("LAYER", layer);
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396
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397 Template t = getTemplateByName("layer.vm");
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398 if (t == null) {
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399 logger.warn("No 'layer.vm' template found.");
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400 return evaluated;
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401 }
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402
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403 t.merge(context, writer);
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404
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405 evaluated.add(writer.toString());
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406 }
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407
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408 return evaluated;
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409 }
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410 }
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411 // vim:set ts=4 sw=4 si et sta sts=4 fenc=utf8 :
http://dive4elements.wald.intevation.org