Mercurial > dive4elements > river

annotate flys-client/src/main/java/de/intevation/flys/client/server/CapabilitiesParser.java @ 1417:42d6cf6e10b7

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Moved code to parse WMS Capabilities to an own class 'CapabilitiesParser' and added code to parse SRS definitions. flys-client/trunk@3325 c6561f87-3c4e-4783-a992-168aeb5c3f6f
author Ingo Weinzierl <ingo.weinzierl@intevation.de>
date Mon, 28 Nov 2011 15:55:26 +0000
parents
children ea2aae01e7c4
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;
42d6cf6e10b7 Moved code to parse WMS Capabilities to an own class 'CapabilitiesParser' and added code to parse SRS definitions.
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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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12
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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.Node;
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17 import org.w3c.dom.NodeList;
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19 import org.apache.log4j.Logger;
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21 import de.intevation.artifacts.common.utils.XMLUtils;
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23 import de.intevation.flys.client.shared.exceptions.ServerException;
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24 import de.intevation.flys.client.shared.model.Capabilities;
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25 import de.intevation.flys.client.shared.model.ContactInformation;
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26 import de.intevation.flys.client.shared.model.WMSLayer;
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29 public class CapabilitiesParser {
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30
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31 private static final Logger logger =
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32 Logger.getLogger(CapabilitiesParser.class);
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33
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35 public static final String ERR_GC_REQUEST_FAILED =
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36 "error_gc_req_failed";
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38 public static final String ERR_GC_DOC_NOT_VALID =
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39 "error_gc_doc_not_valid";
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41 public static final String ERR_MALFORMED_URL =
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42 "error_malformed_url";
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43
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45 public static final String XPATH_WMS_CAPS =
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46 "/WMS_Capabilities";
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47
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48 public static final String XPATH_WMT_CAPS =
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49 "/WMT_MS_Capabilities";
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50
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51 public static final String XPATH_TITLE =
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52 "Service/Title/text()";
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53
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54 public static final String XPATH_ONLINE_RESOURCE =
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55 "Service/OnlineResource/@href";
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56
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57 public static final String XPATH_CONTACT_INFORMATION =
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58 "Service/ContactInformation";
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60 public static final String XPATH_CI_PERSON =
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61 "ContactPersonPrimary/ContactPerson/text()";
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62
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63 public static final String XPATH_CI_ORGANIZATION =
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64 "ContactPersonPrimary/ContactOrganization/text()";
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65
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66 public static final String XPATH_CI_ADDRESS =
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67 "ContactAddress/Address/text()";
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68
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69 public static final String XPATH_CI_CITY =
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70 "ContactAddress/City/text()";
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71
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72 public static final String XPATH_CI_POSTCODE =
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73 "ContactAddress/PostCode/text()";
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74
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75 public static final String XPATH_CI_PHONE =
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76 "ContactVoiceTelephone/text()";
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77
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78 public static final String XPATH_CI_EMAIL =
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79 "ContactElectronicMailAddress/text()";
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80
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81 public static final String XPATH_FEES =
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82 "Service/Fees/text()";
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83
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84 public static final String XPATH_ACCESS_CONSTRAINTS =
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85 "Service/AccessConstraints/text()";
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86
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87 public static final String XPATH_LAYERS =
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88 "Capability/Layer";
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89
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90 public static final Pattern SRS_PATTERN = Pattern.compile("(EPSG:\\d+)*");
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91
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93 private CapabilitiesParser() {
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94 }
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95
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97 public static void main(String[] args) {
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98 logger.info("Do static Capabilities request/parsing.");
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99
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100 String log4jProperties = System.getenv(BaseServlet.LOG4J_PROPERTIES);
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101 LoggingConfigurator.init(log4jProperties);
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102
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103 try {
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104 Capabilities caps = getCapabilities(
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105 "http://czech-republic.atlas.intevation.de/cgi-bin/saar-wms?REQUEST=GetCapabilities&SERVICE=WMS&VERSION=1.1.0");
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106 }
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107 catch (ServerException se) {
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108 se.printStackTrace();
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109 }
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110
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111 logger.info("Finished fetching capabiltiies.");
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112 }
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113
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114
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115 public static Capabilities getCapabilities(String urlStr)
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116 throws ServerException
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117 {
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118 try {
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119 URL url = new URL(urlStr);
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120
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121 logger.debug("Open connection to url: " + urlStr);
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122
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123 URLConnection conn = url.openConnection();
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124 conn.connect();
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125
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126 InputStream is = conn.getInputStream();
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127
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128 return parse(is);
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129 }
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130 catch (MalformedURLException mue) {
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131 logger.warn(mue, mue);
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132 throw new ServerException(ERR_MALFORMED_URL);
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133 }
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134 catch (IOException ioe) {
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135 logger.warn(ioe, ioe);
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136 }
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137
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138 throw new ServerException(ERR_GC_REQUEST_FAILED);
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139 }
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140
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141
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142 protected static Capabilities parse(InputStream is)
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143 throws ServerException
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144 {
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145 logger.debug("GCServiceImpl.parseCapabilitiesResponse");
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146
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147 Document doc = XMLUtils.parseDocument(is, false);
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148
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149 if (doc == null) {
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150 throw new ServerException(ERR_GC_DOC_NOT_VALID);
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151 }
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152
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153 return CapabilitiesParser.parse(doc);
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154 }
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155
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156
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157 public static Capabilities parse(Document doc)
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158 throws ServerException
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159 {
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160 Node capabilities = getCapabilitiesNode(doc);
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161
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162 String title = (String) XMLUtils.xpath(
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163 capabilities,
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164 XPATH_TITLE,
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165 XPathConstants.STRING);
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166
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167 String onlineResource = (String) XMLUtils.xpath(
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168 capabilities,
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169 XPATH_ONLINE_RESOURCE,
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170 XPathConstants.STRING);
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171
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172 String fees = (String) XMLUtils.xpath(
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173 capabilities,
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174 XPATH_FEES,
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175 XPathConstants.STRING);
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176
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177 String accessConstraints = (String) XMLUtils.xpath(
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178 capabilities,
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179 XPATH_ACCESS_CONSTRAINTS,
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180 XPathConstants.STRING);
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181
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182 Node contactInformation = (Node) XMLUtils.xpath(
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183 capabilities,
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184 XPATH_CONTACT_INFORMATION,
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185 XPathConstants.NODE);
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186
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187 ContactInformation ci = parseContactInformation(contactInformation);
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188
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189 logger.debug("Found fees: " + fees);
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190 logger.debug("Found access constraints: " + accessConstraints);
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191
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192 NodeList layerNodes = (NodeList) XMLUtils.xpath(
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193 capabilities,
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194 XPATH_LAYERS,
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195 XPathConstants.NODESET);
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196
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197 List<WMSLayer> layers = parseLayers(layerNodes, onlineResource);
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198
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199 return new Capabilities(
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200 title,
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201 onlineResource,
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202 ci,
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203 fees,
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204 accessConstraints,
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205 layers);
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206 }
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207
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208
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209 protected static Node getCapabilitiesNode(Document doc)
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210 throws ServerException {
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211 Node capabilities = (Node) XMLUtils.xpath(
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212 doc,
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213 XPATH_WMS_CAPS,
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214 XPathConstants.NODE);
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215
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216 if (capabilities == null) {
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217 logger.info("No '/WMS_Capabilities' node found.");
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218 logger.info("Try to find a '/WMT_MS_Capabilities' node.");
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219
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220 capabilities = (Node) XMLUtils.xpath(
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221 doc,
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222 XPATH_WMT_CAPS,
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223 XPathConstants.NODE);
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224 }
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225
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226 if (capabilities == null) {
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227 throw new ServerException(ERR_GC_DOC_NOT_VALID);
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228 }
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229
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230 return capabilities;
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231 }
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232
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233
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234 protected static ContactInformation parseContactInformation(Node node) {
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235 String person = (String) XMLUtils.xpath(
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236 node,
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237 XPATH_CI_PERSON,
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238 XPathConstants.STRING);
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239
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240 String organization = (String) XMLUtils.xpath(
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241 node,
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242 XPATH_CI_ORGANIZATION,
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243 XPathConstants.STRING);
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244
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245 String address = (String) XMLUtils.xpath(
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246 node,
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247 XPATH_CI_ADDRESS,
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248 XPathConstants.STRING);
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249
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250 String postcode = (String) XMLUtils.xpath(
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251 node,
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252 XPATH_CI_POSTCODE,
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253 XPathConstants.STRING);
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254
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255 String city = (String) XMLUtils.xpath(
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256 node,
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257 XPATH_CI_CITY,
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258 XPathConstants.STRING);
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259
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260 String phone = (String) XMLUtils.xpath(
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261 node,
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262 XPATH_CI_PHONE,
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263 XPathConstants.STRING);
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264
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265 String email = (String) XMLUtils.xpath(
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266 node,
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267 XPATH_CI_EMAIL,
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268 XPathConstants.STRING);
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269
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270 ContactInformation ci = new ContactInformation();
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271 ci.setPerson(person);
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272 ci.setOrganization(organization);
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273 ci.setAddress(address);
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274 ci.setPostcode(postcode);
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275 ci.setCity(city);
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276 ci.setPhone(phone);
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277 ci.setEmail(email);
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278
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279 return ci;
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280 }
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281
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282
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283 /**
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284 * @param layersNode
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285 * @param onlineResource
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286 *
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287 * @return
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288 */
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289 protected static List<WMSLayer> parseLayers(
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290 NodeList layersNode,
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291 String onlineResource
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292 ) {
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293 int len = layersNode != null ? layersNode.getLength() : 0;
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294
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295 logger.debug("Node has " + len + " layers.");
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296
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297 List<WMSLayer> layers = new ArrayList<WMSLayer>(len);
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298
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299 for (int i = 0; i < len; i++) {
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300 layers.add(parseLayer(layersNode.item(i), onlineResource));
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301 }
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302
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303 return layers;
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304 }
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305
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306
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307 protected static WMSLayer parseLayer(Node layerNode, String onlineResource) {
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308 String title = (String) XMLUtils.xpath(
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309 layerNode,
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310 "Title/text()",
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311 XPathConstants.STRING);
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312
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313 String name = (String) XMLUtils.xpath(
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314 layerNode,
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315 "Name/text()",
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316 XPathConstants.STRING);
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317
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318 logger.debug("Found layer: " + title + "(" + name + ")");
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319
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320 List<String> srs = parseSRS(layerNode);
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321
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322 NodeList layersNodes = (NodeList) XMLUtils.xpath(
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323 layerNode,
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324 "Layer",
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325 XPathConstants.NODESET);
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326
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327 List<WMSLayer> layers = parseLayers(layersNodes, onlineResource);
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328
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329 return new WMSLayer(onlineResource, title, name, srs, layers);
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330 }
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331
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332
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333 protected static List<String> parseSRS(Node layerNode) {
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334 String srsStr = (String) XMLUtils.xpath(
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335 layerNode,
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336 "SRS/text()",
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337 XPathConstants.STRING);
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338
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339 if (srsStr == null || srsStr.length() == 0) {
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340 logger.debug("No explicit SRS for this layer specified.");
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341 return null;
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342 }
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343
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344 String[] splittedSrs = srsStr.split(" ");
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345 List<String> srs = new ArrayList<String>();
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346
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347 for (String singleSrs: splittedSrs) {
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348 Matcher m = SRS_PATTERN.matcher(singleSrs);
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349
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350 if (m.matches()) {
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351 logger.debug("Found SRS '" + m.group(1) + "'");
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352 srs.add(m.group(1));
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353 }
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354 }
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355
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356 return srs;
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357 }
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358 }
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359 // vim:set ts=4 sw=4 si et sta sts=4 fenc=utf8 :
http://dive4elements.wald.intevation.org