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annotate flys-client/src/main/java/de/intevation/flys/client/server/CapabilitiesParser.java @ 5071:50e3d5860e3d dami

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Doc: minor fixes.
author Felix Wolfsteller <felix.wolfsteller@intevation.de>
date Wed, 20 Feb 2013 09:16:30 +0100
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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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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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