Mercurial > dive4elements > river

annotate gwt-client/src/main/java/org/dive4elements/river/client/server/CapabilitiesParser.java @ 5861:172338b1407f

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GWT client: Added copyright header.
author Sascha L. Teichmann <teichmann@intevation.de>
date Sun, 28 Apr 2013 14:30:15 +0200
parents 5aa05a7a34b7
children ea9eef426962
rev   line source
5861
172338b1407f GWT client: Added copyright header.
Sascha L. Teichmann <teichmann@intevation.de>
parents: 5838
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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.client.server;
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11 import java.io.InputStream;
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12 import java.io.IOException;
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13 import java.net.MalformedURLException;
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14 import java.net.URL;
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15 import java.net.URLConnection;
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16 import java.util.ArrayList;
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17 import java.util.List;
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18 import java.util.regex.Matcher;
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19 import java.util.regex.Pattern;
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21 import javax.xml.xpath.XPathConstants;
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23 import org.w3c.dom.Document;
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24 import org.w3c.dom.Element;
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25 import org.w3c.dom.Node;
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26 import org.w3c.dom.NodeList;
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28 import org.apache.log4j.Logger;
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29
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30 import org.dive4elements.artifacts.common.utils.XMLUtils;
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31
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32 import org.dive4elements.river.client.shared.exceptions.ServerException;
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33 import org.dive4elements.river.client.shared.model.Capabilities;
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34 import org.dive4elements.river.client.shared.model.ContactInformation;
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35 import org.dive4elements.river.client.shared.model.WMSLayer;
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38 public class CapabilitiesParser {
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39
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40 private static final Logger logger =
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41 Logger.getLogger(CapabilitiesParser.class);
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43
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44 public static final String ERR_GC_REQUEST_FAILED =
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45 "error_gc_req_failed";
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47 public static final String ERR_GC_DOC_NOT_VALID =
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48 "error_gc_doc_not_valid";
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49
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50 public static final String ERR_MALFORMED_URL =
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51 "error_malformed_url";
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52
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53
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54 public static final String XPATH_WMS_CAPS =
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55 "/WMS_Capabilities";
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56
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57 public static final String XPATH_WMT_CAPS =
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58 "/WMT_MS_Capabilities";
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59
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60 public static final String XPATH_TITLE =
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61 "Service/Title/text()";
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62
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63 public static final String XPATH_ONLINE_RESOURCE =
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64 "Service/OnlineResource/@href";
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65
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66 public static final String XPATH_CONTACT_INFORMATION =
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67 "Service/ContactInformation";
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68
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69 public static final String XPATH_CI_PERSON =
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70 "ContactPersonPrimary/ContactPerson/text()";
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71
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72 public static final String XPATH_CI_ORGANIZATION =
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73 "ContactPersonPrimary/ContactOrganization/text()";
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74
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75 public static final String XPATH_CI_ADDRESS =
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76 "ContactAddress/Address/text()";
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78 public static final String XPATH_CI_CITY =
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79 "ContactAddress/City/text()";
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81 public static final String XPATH_CI_POSTCODE =
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82 "ContactAddress/PostCode/text()";
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83
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84 public static final String XPATH_CI_PHONE =
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85 "ContactVoiceTelephone/text()";
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87 public static final String XPATH_CI_EMAIL =
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88 "ContactElectronicMailAddress/text()";
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89
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90 public static final String XPATH_FEES =
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91 "Service/Fees/text()";
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93 public static final String XPATH_ACCESS_CONSTRAINTS =
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94 "Service/AccessConstraints/text()";
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96 public static final String XPATH_LAYERS =
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97 "Capability/Layer";
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98
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99 public static final Pattern SRS_PATTERN = Pattern.compile("(EPSG:\\d+)*");
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102 private CapabilitiesParser() {
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103 }
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106 public static void main(String[] args) {
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107 logger.info("Do static Capabilities request/parsing.");
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108
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109 String log4jProperties = System.getenv(BaseServletContextListener.LOG4J_PROPERTIES);
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110 LoggingConfigurator.init(log4jProperties);
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111
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112 try {
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113 Capabilities caps = getCapabilities(System.getProperty("test.wms"));
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114
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115 logger.debug(caps.toString());
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116 }
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117 catch (ServerException se) {
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118 se.printStackTrace();
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119 }
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120
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121 logger.info("Finished fetching capabiltiies.");
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122 }
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123
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124
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125 public static Capabilities getCapabilities(String urlStr)
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126 throws ServerException
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127 {
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128 try {
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129 URL url = new URL(urlStr);
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130
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131 logger.debug("Open connection to url: " + urlStr);
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132
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133 URLConnection conn = url.openConnection();
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134 conn.connect();
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135
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136 InputStream is = conn.getInputStream();
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137
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138 return parse(is);
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139 }
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140 catch (MalformedURLException mue) {
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141 logger.warn(mue, mue);
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142 throw new ServerException(ERR_MALFORMED_URL);
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143 }
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144 catch (IOException ioe) {
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145 logger.warn(ioe, ioe);
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146 }
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147
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148 throw new ServerException(ERR_GC_REQUEST_FAILED);
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149 }
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150
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151
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152 protected static Capabilities parse(InputStream is)
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153 throws ServerException
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154 {
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155 logger.debug("GCServiceImpl.parseCapabilitiesResponse");
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156
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157 Document doc = XMLUtils.parseDocument(is, false);
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158
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159 if (doc == null) {
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160 throw new ServerException(ERR_GC_DOC_NOT_VALID);
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161 }
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162
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163 return CapabilitiesParser.parse(doc);
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164 }
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165
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166
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167 public static Capabilities parse(Document doc)
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168 throws ServerException
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169 {
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170 Node capabilities = getCapabilitiesNode(doc);
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171
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172 String title = (String) XMLUtils.xpath(
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173 capabilities,
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174 XPATH_TITLE,
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175 XPathConstants.STRING);
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176
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177 String onlineResource = (String) XMLUtils.xpath(
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178 capabilities,
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179 XPATH_ONLINE_RESOURCE,
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180 XPathConstants.STRING);
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181
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182 String fees = (String) XMLUtils.xpath(
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183 capabilities,
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184 XPATH_FEES,
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185 XPathConstants.STRING);
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186
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187 String accessConstraints = (String) XMLUtils.xpath(
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188 capabilities,
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189 XPATH_ACCESS_CONSTRAINTS,
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190 XPathConstants.STRING);
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191
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192 Node contactInformation = (Node) XMLUtils.xpath(
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193 capabilities,
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194 XPATH_CONTACT_INFORMATION,
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195 XPathConstants.NODE);
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196
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197 ContactInformation ci = parseContactInformation(contactInformation);
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198
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199 logger.debug("Found fees: " + fees);
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200 logger.debug("Found access constraints: " + accessConstraints);
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201
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202 NodeList layerNodes = (NodeList) XMLUtils.xpath(
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203 capabilities,
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204 XPATH_LAYERS,
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205 XPathConstants.NODESET);
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206
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207 List<WMSLayer> layers = parseLayers(layerNodes, onlineResource);
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208
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209 return new Capabilities(
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210 title,
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211 onlineResource,
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212 ci,
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213 fees,
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214 accessConstraints,
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215 layers);
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216 }
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217
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218
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219 protected static Node getCapabilitiesNode(Document doc)
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220 throws ServerException {
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221 Node capabilities = (Node) XMLUtils.xpath(
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222 doc,
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223 XPATH_WMS_CAPS,
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224 XPathConstants.NODE);
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225
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226 if (capabilities == null) {
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227 logger.info("No '/WMS_Capabilities' node found.");
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228 logger.info("Try to find a '/WMT_MS_Capabilities' node.");
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229
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230 capabilities = (Node) XMLUtils.xpath(
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231 doc,
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232 XPATH_WMT_CAPS,
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233 XPathConstants.NODE);
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234 }
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235
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236 if (capabilities == null) {
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237 throw new ServerException(ERR_GC_DOC_NOT_VALID);
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238 }
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239
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240 return capabilities;
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241 }
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242
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243
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244 protected static ContactInformation parseContactInformation(Node node) {
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245 String person = (String) XMLUtils.xpath(
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246 node,
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247 XPATH_CI_PERSON,
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248 XPathConstants.STRING);
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249
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250 String organization = (String) XMLUtils.xpath(
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251 node,
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252 XPATH_CI_ORGANIZATION,
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253 XPathConstants.STRING);
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254
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255 String address = (String) XMLUtils.xpath(
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256 node,
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257 XPATH_CI_ADDRESS,
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258 XPathConstants.STRING);
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259
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260 String postcode = (String) XMLUtils.xpath(
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261 node,
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262 XPATH_CI_POSTCODE,
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263 XPathConstants.STRING);
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264
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265 String city = (String) XMLUtils.xpath(
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266 node,
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267 XPATH_CI_CITY,
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268 XPathConstants.STRING);
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269
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270 String phone = (String) XMLUtils.xpath(
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271 node,
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272 XPATH_CI_PHONE,
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273 XPathConstants.STRING);
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274
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275 String email = (String) XMLUtils.xpath(
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276 node,
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277 XPATH_CI_EMAIL,
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278 XPathConstants.STRING);
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279
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280 ContactInformation ci = new ContactInformation();
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281 ci.setPerson(person);
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282 ci.setOrganization(organization);
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283 ci.setAddress(address);
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284 ci.setPostcode(postcode);
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285 ci.setCity(city);
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286 ci.setPhone(phone);
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287 ci.setEmail(email);
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288
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289 return ci;
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290 }
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291
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292
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293 /**
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294 * @param layersNode
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295 * @param onlineResource
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296 *
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297 * @return
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298 */
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299 protected static List<WMSLayer> parseLayers(
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300 NodeList layersNode,
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301 String onlineResource
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302 ) {
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303 int len = layersNode != null ? layersNode.getLength() : 0;
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304
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305 logger.debug("Node has " + len + " layers.");
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306
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307 List<WMSLayer> layers = new ArrayList<WMSLayer>(len);
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308
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309 for (int i = 0; i < len; i++) {
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310 layers.add(parseLayer(layersNode.item(i), onlineResource));
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311 }
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312
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313 return layers;
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314 }
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315
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316
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317 protected static WMSLayer parseLayer(Node layerNode, String onlineResource) {
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318 String title = (String) XMLUtils.xpath(
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319 layerNode,
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320 "Title/text()",
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321 XPathConstants.STRING);
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322
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323 String name = (String) XMLUtils.xpath(
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324 layerNode,
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325 "Name/text()",
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326 XPathConstants.STRING);
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327
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328 logger.debug("Found layer: " + title + "(" + name + ")");
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329
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330 List<String> srs = parseSRS(layerNode);
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331
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332 NodeList layersNodes = (NodeList) XMLUtils.xpath(
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333 layerNode,
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334 "Layer",
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335 XPathConstants.NODESET);
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336
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337 List<WMSLayer> layers = parseLayers(layersNodes, onlineResource);
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338
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339 return new WMSLayer(onlineResource, title, name, srs, layers);
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340 }
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341
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342
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343 protected static List<String> parseSRS(Node layerNode) {
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344 NodeList srsNodes = ((Element) layerNode).getElementsByTagName("SRS");
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345
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346 if (srsNodes.getLength() == 0) {
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347 srsNodes = ((Element) layerNode).getElementsByTagName("CRS");
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348
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349 if (srsNodes.getLength() == 0) {
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350 logger.debug("No explicit SRS for this layer specified.");
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351 return null;
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352 }
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353 }
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354
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355 List<String> allSRS = new ArrayList<String>();
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356
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357 for (int i = 0, n = srsNodes.getLength(); i < n; i++) {
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358 List<String> srs = parseSRSItem(srsNodes.item(i).getTextContent());
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359
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360 if (srs != null && srs.size() > 0) {
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361 allSRS.addAll(srs);
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362 }
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363 }
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364
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365 return allSRS;
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366 }
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367
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368
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369 protected static List<String> parseSRSItem(String srsStr) {
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370 if (srsStr == null || srsStr.length() == 0) {
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371 return null;
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372 }
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373
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374 List<String> allSRS = new ArrayList<String>();
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375
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376 if (srsStr.indexOf(" ") <= 0) {
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377 String srs = getSRSFromString(srsStr);
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378 if (srs != null && srs.length() > 0) {
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379 allSRS.add(srs);
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380 }
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381
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382 return allSRS;
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383 }
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384
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385 String[] splittedSrs = srsStr.split(" ");
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386
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387 for (String singleSrs: splittedSrs) {
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388 String srs = getSRSFromString(singleSrs);
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389 if (srs != null && srs.length() > 0) {
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390 allSRS.add(srs);
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391 }
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392 }
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393
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394 return allSRS;
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395 }
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396
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397
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398 protected static String getSRSFromString(String singleSrs) {
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399 Matcher m = SRS_PATTERN.matcher(singleSrs);
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400
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401 if (m.matches()) {
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402 logger.debug("Found SRS '" + m.group(1) + "'");
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403 return m.group(1);
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404 }
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405
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406 return null;
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407 }
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408 }
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409 // vim:set ts=4 sw=4 si et sta sts=4 fenc=utf8 :
http://dive4elements.wald.intevation.org