Mercurial > dive4elements > river

annotate flys-client/src/main/java/de/intevation/flys/client/server/CapabilitiesParser.java @ 5818:a4ff4167be1e

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Request feature info on all layers and show it as html if the server does not return valid gml. Non queryable layers produce an error message when the request fails. This is good enough
author Andre Heinecke <aheinecke@intevation.de>
date Wed, 24 Apr 2013 17:33:27 +0200
parents 40d02fbf414d
children
rev   line source
1417
42d6cf6e10b7 Moved code to parse WMS Capabilities to an own class 'CapabilitiesParser' and added code to parse SRS definitions.
Ingo Weinzierl <ingo.weinzierl@intevation.de>
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1 package de.intevation.flys.client.server;
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2
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3 import java.io.InputStream;
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4 import java.io.IOException;
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5 import java.net.MalformedURLException;
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6 import java.net.URL;
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7 import java.net.URLConnection;
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8 import java.util.ArrayList;
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9 import java.util.List;
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10 import java.util.regex.Matcher;
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11 import java.util.regex.Pattern;
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13 import javax.xml.xpath.XPathConstants;
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15 import org.w3c.dom.Document;
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16 import org.w3c.dom.Element;
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17 import org.w3c.dom.Node;
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18 import org.w3c.dom.NodeList;
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20 import org.apache.log4j.Logger;
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22 import de.intevation.artifacts.common.utils.XMLUtils;
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24 import de.intevation.flys.client.shared.exceptions.ServerException;
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25 import de.intevation.flys.client.shared.model.Capabilities;
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26 import de.intevation.flys.client.shared.model.ContactInformation;
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27 import de.intevation.flys.client.shared.model.WMSLayer;
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30 public class CapabilitiesParser {
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32 private static final Logger logger =
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33 Logger.getLogger(CapabilitiesParser.class);
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36 public static final String ERR_GC_REQUEST_FAILED =
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37 "error_gc_req_failed";
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39 public static final String ERR_GC_DOC_NOT_VALID =
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40 "error_gc_doc_not_valid";
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42 public static final String ERR_MALFORMED_URL =
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43 "error_malformed_url";
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46 public static final String XPATH_WMS_CAPS =
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47 "/WMS_Capabilities";
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49 public static final String XPATH_WMT_CAPS =
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50 "/WMT_MS_Capabilities";
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51
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52 public static final String XPATH_TITLE =
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53 "Service/Title/text()";
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54
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55 public static final String XPATH_ONLINE_RESOURCE =
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56 "Service/OnlineResource/@href";
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57
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58 public static final String XPATH_CONTACT_INFORMATION =
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59 "Service/ContactInformation";
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61 public static final String XPATH_CI_PERSON =
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62 "ContactPersonPrimary/ContactPerson/text()";
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63
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64 public static final String XPATH_CI_ORGANIZATION =
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65 "ContactPersonPrimary/ContactOrganization/text()";
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67 public static final String XPATH_CI_ADDRESS =
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68 "ContactAddress/Address/text()";
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70 public static final String XPATH_CI_CITY =
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71 "ContactAddress/City/text()";
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73 public static final String XPATH_CI_POSTCODE =
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74 "ContactAddress/PostCode/text()";
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76 public static final String XPATH_CI_PHONE =
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77 "ContactVoiceTelephone/text()";
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79 public static final String XPATH_CI_EMAIL =
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80 "ContactElectronicMailAddress/text()";
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82 public static final String XPATH_FEES =
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83 "Service/Fees/text()";
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85 public static final String XPATH_ACCESS_CONSTRAINTS =
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86 "Service/AccessConstraints/text()";
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88 public static final String XPATH_LAYERS =
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89 "Capability/Layer";
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91 public static final Pattern SRS_PATTERN = Pattern.compile("(EPSG:\\d+)*");
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94 private CapabilitiesParser() {
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95 }
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98 public static void main(String[] args) {
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99 logger.info("Do static Capabilities request/parsing.");
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100
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101 String log4jProperties = System.getenv(BaseServletContextListener.LOG4J_PROPERTIES);
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102 LoggingConfigurator.init(log4jProperties);
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103
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104 try {
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105 Capabilities caps = getCapabilities(System.getProperty("test.wms"));
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106
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107 logger.debug(caps.toString());
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108 }
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109 catch (ServerException se) {
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110 se.printStackTrace();
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111 }
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112
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113 logger.info("Finished fetching capabiltiies.");
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114 }
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115
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116
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117 public static Capabilities getCapabilities(String urlStr)
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118 throws ServerException
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119 {
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120 try {
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121 URL url = new URL(urlStr);
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122
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123 logger.debug("Open connection to url: " + urlStr);
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124
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125 URLConnection conn = url.openConnection();
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126 conn.connect();
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127
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128 InputStream is = conn.getInputStream();
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129
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130 return parse(is);
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131 }
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132 catch (MalformedURLException mue) {
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133 logger.warn(mue, mue);
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134 throw new ServerException(ERR_MALFORMED_URL);
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135 }
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136 catch (IOException ioe) {
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137 logger.warn(ioe, ioe);
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138 }
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139
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140 throw new ServerException(ERR_GC_REQUEST_FAILED);
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141 }
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142
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143
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144 protected static Capabilities parse(InputStream is)
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145 throws ServerException
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146 {
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147 logger.debug("GCServiceImpl.parseCapabilitiesResponse");
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148
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149 Document doc = XMLUtils.parseDocument(is, false);
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150
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151 if (doc == null) {
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152 throw new ServerException(ERR_GC_DOC_NOT_VALID);
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153 }
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154
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155 return CapabilitiesParser.parse(doc);
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156 }
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157
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158
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159 public static Capabilities parse(Document doc)
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160 throws ServerException
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161 {
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162 Node capabilities = getCapabilitiesNode(doc);
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163
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164 String title = (String) XMLUtils.xpath(
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165 capabilities,
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166 XPATH_TITLE,
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167 XPathConstants.STRING);
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168
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169 String onlineResource = (String) XMLUtils.xpath(
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170 capabilities,
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171 XPATH_ONLINE_RESOURCE,
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172 XPathConstants.STRING);
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173
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174 String fees = (String) XMLUtils.xpath(
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175 capabilities,
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176 XPATH_FEES,
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177 XPathConstants.STRING);
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178
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179 String accessConstraints = (String) XMLUtils.xpath(
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180 capabilities,
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181 XPATH_ACCESS_CONSTRAINTS,
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182 XPathConstants.STRING);
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183
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184 Node contactInformation = (Node) XMLUtils.xpath(
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185 capabilities,
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186 XPATH_CONTACT_INFORMATION,
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187 XPathConstants.NODE);
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188
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189 ContactInformation ci = parseContactInformation(contactInformation);
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190
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191 logger.debug("Found fees: " + fees);
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192 logger.debug("Found access constraints: " + accessConstraints);
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193
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194 NodeList layerNodes = (NodeList) XMLUtils.xpath(
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195 capabilities,
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196 XPATH_LAYERS,
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197 XPathConstants.NODESET);
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198
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199 List<WMSLayer> layers = parseLayers(layerNodes, onlineResource);
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200
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201 return new Capabilities(
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202 title,
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203 onlineResource,
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204 ci,
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205 fees,
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206 accessConstraints,
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207 layers);
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208 }
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209
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210
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211 protected static Node getCapabilitiesNode(Document doc)
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212 throws ServerException {
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213 Node capabilities = (Node) XMLUtils.xpath(
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214 doc,
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215 XPATH_WMS_CAPS,
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216 XPathConstants.NODE);
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217
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218 if (capabilities == null) {
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219 logger.info("No '/WMS_Capabilities' node found.");
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220 logger.info("Try to find a '/WMT_MS_Capabilities' node.");
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221
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222 capabilities = (Node) XMLUtils.xpath(
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223 doc,
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224 XPATH_WMT_CAPS,
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225 XPathConstants.NODE);
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226 }
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227
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228 if (capabilities == null) {
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229 throw new ServerException(ERR_GC_DOC_NOT_VALID);
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230 }
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231
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232 return capabilities;
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233 }
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234
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235
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236 protected static ContactInformation parseContactInformation(Node node) {
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237 String person = (String) XMLUtils.xpath(
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238 node,
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239 XPATH_CI_PERSON,
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240 XPathConstants.STRING);
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241
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242 String organization = (String) XMLUtils.xpath(
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243 node,
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244 XPATH_CI_ORGANIZATION,
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245 XPathConstants.STRING);
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246
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247 String address = (String) XMLUtils.xpath(
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248 node,
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249 XPATH_CI_ADDRESS,
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250 XPathConstants.STRING);
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251
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252 String postcode = (String) XMLUtils.xpath(
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253 node,
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254 XPATH_CI_POSTCODE,
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255 XPathConstants.STRING);
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256
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257 String city = (String) XMLUtils.xpath(
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258 node,
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259 XPATH_CI_CITY,
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260 XPathConstants.STRING);
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261
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262 String phone = (String) XMLUtils.xpath(
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263 node,
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264 XPATH_CI_PHONE,
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265 XPathConstants.STRING);
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266
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267 String email = (String) XMLUtils.xpath(
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268 node,
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269 XPATH_CI_EMAIL,
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270 XPathConstants.STRING);
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271
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272 ContactInformation ci = new ContactInformation();
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273 ci.setPerson(person);
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274 ci.setOrganization(organization);
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275 ci.setAddress(address);
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276 ci.setPostcode(postcode);
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277 ci.setCity(city);
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278 ci.setPhone(phone);
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279 ci.setEmail(email);
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280
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281 return ci;
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282 }
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283
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284
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285 /**
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286 * @param layersNode
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287 * @param onlineResource
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288 *
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289 * @return
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290 */
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291 protected static List<WMSLayer> parseLayers(
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292 NodeList layersNode,
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293 String onlineResource
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294 ) {
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295 int len = layersNode != null ? layersNode.getLength() : 0;
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296
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297 logger.debug("Node has " + len + " layers.");
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298
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299 List<WMSLayer> layers = new ArrayList<WMSLayer>(len);
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300
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301 for (int i = 0; i < len; i++) {
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302 layers.add(parseLayer(layersNode.item(i), onlineResource));
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303 }
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304
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305 return layers;
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306 }
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307
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308
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309 protected static WMSLayer parseLayer(Node layerNode, String onlineResource) {
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310 String title = (String) XMLUtils.xpath(
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311 layerNode,
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312 "Title/text()",
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313 XPathConstants.STRING);
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314
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315 String name = (String) XMLUtils.xpath(
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316 layerNode,
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317 "Name/text()",
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318 XPathConstants.STRING);
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319
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320 logger.debug("Found layer: " + title + "(" + name + ")");
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321
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322 List<String> srs = parseSRS(layerNode);
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323
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324 NodeList layersNodes = (NodeList) XMLUtils.xpath(
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325 layerNode,
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326 "Layer",
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327 XPathConstants.NODESET);
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328
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329 List<WMSLayer> layers = parseLayers(layersNodes, onlineResource);
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330
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331 return new WMSLayer(onlineResource, title, name, srs, layers);
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332 }
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333
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334
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335 protected static List<String> parseSRS(Node layerNode) {
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336 NodeList srsNodes = ((Element) layerNode).getElementsByTagName("SRS");
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337
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338 if (srsNodes.getLength() == 0) {
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339 srsNodes = ((Element) layerNode).getElementsByTagName("CRS");
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340
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341 if (srsNodes.getLength() == 0) {
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342 logger.debug("No explicit SRS for this layer specified.");
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343 return null;
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344 }
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345 }
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346
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347 List<String> allSRS = new ArrayList<String>();
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348
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349 for (int i = 0, n = srsNodes.getLength(); i < n; i++) {
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350 List<String> srs = parseSRSItem(srsNodes.item(i).getTextContent());
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351
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352 if (srs != null && srs.size() > 0) {
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353 allSRS.addAll(srs);
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354 }
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355 }
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356
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357 return allSRS;
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358 }
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359
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360
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361 protected static List<String> parseSRSItem(String srsStr) {
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362 if (srsStr == null || srsStr.length() == 0) {
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363 return null;
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364 }
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365
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366 List<String> allSRS = new ArrayList<String>();
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367
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368 if (srsStr.indexOf(" ") <= 0) {
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369 String srs = getSRSFromString(srsStr);
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370 if (srs != null && srs.length() > 0) {
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371 allSRS.add(srs);
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372 }
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373
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374 return allSRS;
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375 }
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376
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377 String[] splittedSrs = srsStr.split(" ");
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378
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379 for (String singleSrs: splittedSrs) {
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380 String srs = getSRSFromString(singleSrs);
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381 if (srs != null && srs.length() > 0) {
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382 allSRS.add(srs);
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383 }
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384 }
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385
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386 return allSRS;
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387 }
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388
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389
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390 protected static String getSRSFromString(String singleSrs) {
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391 Matcher m = SRS_PATTERN.matcher(singleSrs);
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392
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393 if (m.matches()) {
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394 logger.debug("Found SRS '" + m.group(1) + "'");
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395 return m.group(1);
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396 }
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397
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398 return null;
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399 }
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400 }
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401 // vim:set ts=4 sw=4 si et sta sts=4 fenc=utf8 :
http://dive4elements.wald.intevation.org