Mercurial > dive4elements > river

annotate gwt-client/src/main/java/org/dive4elements/river/client/server/CapabilitiesParser.java @ 6826:74a437805e2a

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Mapfile templates contain regex expressions to catch features more robust (#657). Mapfile generation code is still confusing and should be refactored.
author Christian Lins <christian.lins@intevation.de>
date Wed, 14 Aug 2013 14:20:59 +0200
parents 97339d3955d7
children 8c7433b8656d
rev   line source
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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
172338b1407f GWT client: Added copyright header.
Sascha L. Teichmann <teichmann@intevation.de>
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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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821a02bbfb4e Fixed internal java dependencies
Sascha L. Teichmann <teichmann@intevation.de>
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9 package org.dive4elements.river.client.server;
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parents: 5993
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11 import java.io.IOException;
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12 import java.io.InputStream;
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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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20
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21 import javax.xml.xpath.XPathConstants;
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22
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23 import org.apache.log4j.Logger;
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24 import org.dive4elements.artifacts.common.utils.XMLUtils;
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25 import org.dive4elements.river.client.shared.exceptions.ServerException;
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26 import org.dive4elements.river.client.shared.model.Capabilities;
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27 import org.dive4elements.river.client.shared.model.ContactInformation;
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28 import org.dive4elements.river.client.shared.model.WMSLayer;
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29 import org.w3c.dom.Document;
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30 import org.w3c.dom.Element;
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31 import org.w3c.dom.Node;
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32 import org.w3c.dom.NodeList;
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33
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34 /**
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35 * Parser for GetCapabilities of a WMS.
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36 */
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37 public class CapabilitiesParser {
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38
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39 private static final Logger logger =
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40 Logger.getLogger(CapabilitiesParser.class);
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42
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43 public static final String ERR_GC_REQUEST_FAILED =
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44 "error_gc_req_failed";
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45
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46 public static final String ERR_GC_DOC_NOT_VALID =
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47 "error_gc_doc_not_valid";
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48
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49 public static final String ERR_MALFORMED_URL =
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50 "error_malformed_url";
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51
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52
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53 public static final String XPATH_WMS_CAPS =
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54 "/WMS_Capabilities";
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55
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56 public static final String XPATH_WMT_CAPS =
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57 "/WMT_MS_Capabilities";
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58
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59 public static final String XPATH_TITLE =
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60 "Service/Title/text()";
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61
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62 public static final String XPATH_ONLINE_RESOURCE =
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63 "Service/OnlineResource/@href";
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64
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65 public static final String XPATH_CONTACT_INFORMATION =
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66 "Service/ContactInformation";
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67
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68 public static final String XPATH_CI_PERSON =
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69 "ContactPersonPrimary/ContactPerson/text()";
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70
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71 public static final String XPATH_CI_ORGANIZATION =
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72 "ContactPersonPrimary/ContactOrganization/text()";
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73
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74 public static final String XPATH_CI_ADDRESS =
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75 "ContactAddress/Address/text()";
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76
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77 public static final String XPATH_CI_CITY =
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78 "ContactAddress/City/text()";
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79
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80 public static final String XPATH_CI_POSTCODE =
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81 "ContactAddress/PostCode/text()";
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82
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83 public static final String XPATH_CI_PHONE =
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84 "ContactVoiceTelephone/text()";
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85
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86 public static final String XPATH_CI_EMAIL =
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87 "ContactElectronicMailAddress/text()";
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89 public static final String XPATH_FEES =
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90 "Service/Fees/text()";
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92 public static final String XPATH_ACCESS_CONSTRAINTS =
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93 "Service/AccessConstraints/text()";
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95 public static final String XPATH_LAYERS =
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96 "Capability/Layer";
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97
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98 public static final String XPATH_MAP_FORMAT =
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99 "Capability/Request/GetMap/Format";
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100
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101 public static final String XPATH_GETMAP_ONLINERESOURCE =
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102 "Capability/Request/GetMap/DCPType/HTTP/Get/OnlineResource/@href";
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103
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104 public static final Pattern SRS_PATTERN = Pattern.compile("(EPSG:\\d+)*");
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106
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107 private CapabilitiesParser() {
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108 }
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109
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110
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111 public static void main(String[] args) {
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112 logger.info("Do static Capabilities request/parsing.");
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113
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114 String log4jProperties = System.getenv(BaseServletContextListener.LOG4J_PROPERTIES);
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115 LoggingConfigurator.init(log4jProperties);
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116
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117 try {
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118 String wmsURL = System.getProperty("test.wms");
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119 if (wmsURL == null || args.length > 0) {
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120 wmsURL = args[0];
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121 }
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122 Capabilities caps = getCapabilities(wmsURL);
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123
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124 logger.debug(caps.toString());
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125 System.out.println(caps.toString());
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126 }
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127 catch (ServerException se) {
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128 se.printStackTrace();
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129 }
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130
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131 logger.info("Finished fetching capabiltiies.");
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132 }
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133
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134
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135 public static Capabilities getCapabilities(String urlStr)
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136 throws ServerException
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137 {
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138 try {
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139 URL url = new URL(urlStr);
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140
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141 logger.debug("Open connection to url: " + urlStr);
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142
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143 URLConnection conn = url.openConnection();
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144 conn.connect();
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145
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146 InputStream is = conn.getInputStream();
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147
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148 return parse(is);
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149 }
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150 catch (MalformedURLException mue) {
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151 logger.warn(mue, mue);
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152 throw new ServerException(ERR_MALFORMED_URL);
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153 }
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154 catch (IOException ioe) {
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155 logger.warn(ioe, ioe);
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156 }
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157
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158 throw new ServerException(ERR_GC_REQUEST_FAILED);
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159 }
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160
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161
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162 protected static Capabilities parse(InputStream is)
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163 throws ServerException
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164 {
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165 logger.debug("GCServiceImpl.parseCapabilitiesResponse");
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166
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167 Document doc = XMLUtils.parseDocument(is, false);
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168
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169 if (doc == null) {
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170 throw new ServerException(ERR_GC_DOC_NOT_VALID);
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171 }
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172
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173 return CapabilitiesParser.parse(doc);
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174 }
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175
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176
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177 public static Capabilities parse(Document doc)
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178 throws ServerException
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179 {
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180 Node capabilities = getCapabilitiesNode(doc);
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181
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182 String title = (String) XMLUtils.xpath(
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183 capabilities,
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184 XPATH_TITLE,
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185 XPathConstants.STRING);
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186
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187 String onlineResource = (String) XMLUtils.xpath(
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188 capabilities,
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189 XPATH_ONLINE_RESOURCE,
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190 XPathConstants.STRING);
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191
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192 String fees = (String) XMLUtils.xpath(
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193 capabilities,
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194 XPATH_FEES,
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195 XPathConstants.STRING);
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196
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197 String accessConstraints = (String) XMLUtils.xpath(
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198 capabilities,
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199 XPATH_ACCESS_CONSTRAINTS,
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200 XPathConstants.STRING);
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201
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202 Node contactInformation = (Node) XMLUtils.xpath(
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203 capabilities,
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204 XPATH_CONTACT_INFORMATION,
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205 XPathConstants.NODE);
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206
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207 ContactInformation ci = parseContactInformation(contactInformation);
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208
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209 logger.debug("Found fees: " + fees);
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210 logger.debug("Found access constraints: " + accessConstraints);
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211
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212 NodeList layerNodes = (NodeList) XMLUtils.xpath(
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213 capabilities,
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214 XPATH_LAYERS,
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215 XPathConstants.NODESET);
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216
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217 String getMapOnlineResource = (String) XMLUtils.xpath(
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218 capabilities,
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219 XPATH_GETMAP_ONLINERESOURCE,
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220 XPathConstants.STRING);
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221
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222 List<WMSLayer> layers = parseLayers(layerNodes, getMapOnlineResource);
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223
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224 // Parse MIME types of supported return types, e.g. image/jpeg
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225 NodeList mapFormatNodes = (NodeList)
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226 XMLUtils.xpath(capabilities, XPATH_MAP_FORMAT, XPathConstants.NODESET);
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227 List<String> mapFormats = new ArrayList<String>();
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228 for (int n = 0; n < mapFormatNodes.getLength(); n++) {
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229 mapFormats.add(mapFormatNodes.item(n).getTextContent());
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230 }
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231
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232 return new Capabilities(
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233 title,
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234 onlineResource,
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235 ci,
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236 fees,
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237 accessConstraints,
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238 layers,
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239 mapFormats);
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240 }
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241
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242
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243 protected static Node getCapabilitiesNode(Document doc)
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244 throws ServerException {
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245 Node capabilities = (Node) XMLUtils.xpath(
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246 doc,
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247 XPATH_WMS_CAPS,
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248 XPathConstants.NODE);
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249
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250 if (capabilities == null) {
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251 logger.info("No '/WMS_Capabilities' node found.");
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252 logger.info("Try to find a '/WMT_MS_Capabilities' node.");
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253
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254 capabilities = (Node) XMLUtils.xpath(
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255 doc,
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256 XPATH_WMT_CAPS,
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257 XPathConstants.NODE);
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258 }
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259
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260 if (capabilities == null) {
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261 throw new ServerException(ERR_GC_DOC_NOT_VALID);
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262 }
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263
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264 return capabilities;
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265 }
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266
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267
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268 protected static ContactInformation parseContactInformation(Node node) {
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269 String person = (String) XMLUtils.xpath(
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270 node,
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271 XPATH_CI_PERSON,
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272 XPathConstants.STRING);
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273
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274 String organization = (String) XMLUtils.xpath(
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275 node,
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276 XPATH_CI_ORGANIZATION,
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277 XPathConstants.STRING);
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278
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279 String address = (String) XMLUtils.xpath(
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280 node,
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281 XPATH_CI_ADDRESS,
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282 XPathConstants.STRING);
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283
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284 String postcode = (String) XMLUtils.xpath(
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285 node,
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286 XPATH_CI_POSTCODE,
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287 XPathConstants.STRING);
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288
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289 String city = (String) XMLUtils.xpath(
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290 node,
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291 XPATH_CI_CITY,
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292 XPathConstants.STRING);
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293
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294 String phone = (String) XMLUtils.xpath(
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295 node,
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296 XPATH_CI_PHONE,
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297 XPathConstants.STRING);
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298
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299 String email = (String) XMLUtils.xpath(
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300 node,
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301 XPATH_CI_EMAIL,
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302 XPathConstants.STRING);
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303
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304 ContactInformation ci = new ContactInformation();
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305 ci.setPerson(person);
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306 ci.setOrganization(organization);
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307 ci.setAddress(address);
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308 ci.setPostcode(postcode);
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309 ci.setCity(city);
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310 ci.setPhone(phone);
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311 ci.setEmail(email);
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312
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313 return ci;
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314 }
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315
42d6cf6e10b7 Moved code to parse WMS Capabilities to an own class 'CapabilitiesParser' and added code to parse SRS definitions.
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316
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317 /**
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318 * @param layersNode
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319 * @param onlineResource
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320 *
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321 * @return
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322 */
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323 protected static List<WMSLayer> parseLayers(
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324 NodeList layersNode,
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325 String onlineResource
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326 ) {
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327 int len = layersNode != null ? layersNode.getLength() : 0;
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328
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329 logger.debug("Node has " + len + " layers.");
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330
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331 List<WMSLayer> layers = new ArrayList<WMSLayer>(len);
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332
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333 for (int i = 0; i < len; i++) {
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334 layers.add(parseLayer(layersNode.item(i), onlineResource));
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335 }
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336
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337 return layers;
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338 }
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339
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340
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341 protected static WMSLayer parseLayer(Node layerNode, String onlineResource) {
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342 String title = (String) XMLUtils.xpath(
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343 layerNode,
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344 "Title/text()",
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345 XPathConstants.STRING);
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346
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347 String name = (String) XMLUtils.xpath(
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348 layerNode,
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349 "Name/text()",
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350 XPathConstants.STRING);
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351
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352 logger.debug("Found layer: " + title + "(" + name + ")");
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353
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354 boolean queryable = true;
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355 Node queryableAttr = layerNode.getAttributes().getNamedItem("queryable");
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356 if (queryableAttr != null && queryableAttr.getNodeValue().equals("0")) {
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357 queryable = false;
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358 }
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359
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360 List<String> srs = parseSRS(layerNode);
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361
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362 NodeList layersNodes = (NodeList) XMLUtils.xpath(
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363 layerNode,
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364 "Layer",
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365 XPathConstants.NODESET);
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366
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367 List<WMSLayer> layers = parseLayers(layersNodes, onlineResource);
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368
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369 return new WMSLayer(onlineResource, title, name, srs, layers, queryable);
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370 }
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371
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372
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373 protected static List<String> parseSRS(Node layerNode) {
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374 NodeList srsNodes = ((Element) layerNode).getElementsByTagName("SRS");
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375
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376 if (srsNodes.getLength() == 0) {
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377 srsNodes = ((Element) layerNode).getElementsByTagName("CRS");
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378
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379 if (srsNodes.getLength() == 0) {
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380 logger.debug("No explicit SRS for this layer specified.");
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381 return null;
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382 }
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383 }
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384
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385 List<String> allSRS = new ArrayList<String>();
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386
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387 for (int i = 0, n = srsNodes.getLength(); i < n; i++) {
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388 List<String> srs = parseSRSItem(srsNodes.item(i).getTextContent());
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389
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390 if (srs != null && srs.size() > 0) {
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391 allSRS.addAll(srs);
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392 }
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393 }
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394
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395 return allSRS;
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396 }
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397
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398
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399 protected static List<String> parseSRSItem(String srsStr) {
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400 if (srsStr == null || srsStr.length() == 0) {
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401 return null;
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402 }
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403
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404 List<String> allSRS = new ArrayList<String>();
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405
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406 if (srsStr.indexOf(" ") <= 0) {
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407 String srs = getSRSFromString(srsStr);
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diff changeset
408 if (srs != null && srs.length() > 0) {
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409 allSRS.add(srs);
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410 }
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411
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412 return allSRS;
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413 }
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414
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diff changeset
415 String[] splittedSrs = srsStr.split(" ");
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416
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417 for (String singleSrs: splittedSrs) {
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418 String srs = getSRSFromString(singleSrs);
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419 if (srs != null && srs.length() > 0) {
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420 allSRS.add(srs);
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421 }
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422 }
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423
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424 return allSRS;
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425 }
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426
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diff changeset
427
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428 protected static String getSRSFromString(String singleSrs) {
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429 Matcher m = SRS_PATTERN.matcher(singleSrs);
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430
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431 if (m.matches()) {
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432 logger.debug("Found SRS '" + m.group(1) + "'");
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433 return m.group(1);
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434 }
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diff changeset
435
23ffee639f7c #431 Added support for WMS 1.3.0 projection definitions.
Ingo Weinzierl <ingo.weinzierl@intevation.de>
parents: 1487
diff changeset
436 return null;
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>
parents:
diff changeset
437 }
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>
parents:
diff changeset
438 }
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>
parents:
diff changeset
439 // vim:set ts=4 sw=4 si et sta sts=4 fenc=utf8 :
http://dive4elements.wald.intevation.org