Mercurial > dive4elements > river

annotate gwt-client/src/main/java/org/dive4elements/river/client/server/CapabilitiesParser.java @ 6199:734ba3732bb6

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CapabilitiesParse parses the "queryable" attribute of a WMSLayer now (#1253).
author Christian Lins <christian.lins@intevation.de>
date Wed, 05 Jun 2013 13:13:20 +0200
parents 809c91beee54
children 97339d3955d7
rev   line source
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Sascha L. Teichmann <teichmann@intevation.de>
parents: 5838
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1 /* Copyright (C) 2011, 2012, 2013 by Bundesanstalt für Gewässerkunde
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Sascha L. Teichmann <teichmann@intevation.de>
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2 * Software engineering by Intevation GmbH
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Sascha L. Teichmann <teichmann@intevation.de>
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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
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9 package org.dive4elements.river.client.server;
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11 import org.dive4elements.artifacts.common.utils.XMLUtils;
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12 import org.dive4elements.river.client.shared.exceptions.ServerException;
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13 import org.dive4elements.river.client.shared.model.Capabilities;
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14 import org.dive4elements.river.client.shared.model.ContactInformation;
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15 import org.dive4elements.river.client.shared.model.WMSLayer;
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16
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17 import java.io.IOException;
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18 import java.io.InputStream;
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19 import java.net.MalformedURLException;
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20 import java.net.URL;
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21 import java.net.URLConnection;
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22 import java.util.ArrayList;
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23 import java.util.List;
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24 import java.util.regex.Matcher;
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25 import java.util.regex.Pattern;
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26
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27 import javax.xml.xpath.XPathConstants;
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28
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29 import org.apache.log4j.Logger;
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30 import org.w3c.dom.Document;
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31 import org.w3c.dom.Element;
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32 import org.w3c.dom.Node;
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33 import org.w3c.dom.NodeList;
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34
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35 /**
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36 * Parser for GetCapabilities of a WMS.
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37 */
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38 public class CapabilitiesParser {
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39
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40 private static final Logger logger =
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41 Logger.getLogger(CapabilitiesParser.class);
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42
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43
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44 public static final String ERR_GC_REQUEST_FAILED =
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45 "error_gc_req_failed";
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46
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47 public static final String ERR_GC_DOC_NOT_VALID =
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48 "error_gc_doc_not_valid";
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49
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50 public static final String ERR_MALFORMED_URL =
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51 "error_malformed_url";
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52
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53
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54 public static final String XPATH_WMS_CAPS =
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55 "/WMS_Capabilities";
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56
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57 public static final String XPATH_WMT_CAPS =
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58 "/WMT_MS_Capabilities";
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59
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60 public static final String XPATH_TITLE =
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61 "Service/Title/text()";
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62
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63 public static final String XPATH_ONLINE_RESOURCE =
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64 "Service/OnlineResource/@href";
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65
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66 public static final String XPATH_CONTACT_INFORMATION =
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67 "Service/ContactInformation";
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68
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69 public static final String XPATH_CI_PERSON =
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70 "ContactPersonPrimary/ContactPerson/text()";
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71
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72 public static final String XPATH_CI_ORGANIZATION =
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73 "ContactPersonPrimary/ContactOrganization/text()";
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74
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75 public static final String XPATH_CI_ADDRESS =
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76 "ContactAddress/Address/text()";
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77
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78 public static final String XPATH_CI_CITY =
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79 "ContactAddress/City/text()";
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80
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81 public static final String XPATH_CI_POSTCODE =
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82 "ContactAddress/PostCode/text()";
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83
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84 public static final String XPATH_CI_PHONE =
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85 "ContactVoiceTelephone/text()";
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87 public static final String XPATH_CI_EMAIL =
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88 "ContactElectronicMailAddress/text()";
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89
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90 public static final String XPATH_FEES =
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91 "Service/Fees/text()";
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92
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93 public static final String XPATH_ACCESS_CONSTRAINTS =
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94 "Service/AccessConstraints/text()";
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95
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96 public static final String XPATH_LAYERS =
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97 "Capability/Layer";
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98
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99 public static final String XPATH_MAP_FORMAT =
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100 "Capability/Request/GetMap/Format";
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101
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102 public static final Pattern SRS_PATTERN = Pattern.compile("(EPSG:\\d+)*");
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103
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105 private CapabilitiesParser() {
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106 }
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107
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108
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109 public static void main(String[] args) {
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110 logger.info("Do static Capabilities request/parsing.");
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111
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112 String log4jProperties = System.getenv(BaseServletContextListener.LOG4J_PROPERTIES);
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113 LoggingConfigurator.init(log4jProperties);
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114
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115 try {
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116 String wmsURL = System.getProperty("test.wms");
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117 if (wmsURL == null || args.length > 0) {
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118 wmsURL = args[0];
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119 }
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120 Capabilities caps = getCapabilities(wmsURL);
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121
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122 logger.debug(caps.toString());
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123 System.out.println(caps.toString());
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124 }
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125 catch (ServerException se) {
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126 se.printStackTrace();
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127 }
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128
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129 logger.info("Finished fetching capabiltiies.");
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130 }
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131
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132
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133 public static Capabilities getCapabilities(String urlStr)
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134 throws ServerException
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135 {
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136 try {
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137 URL url = new URL(urlStr);
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138
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139 logger.debug("Open connection to url: " + urlStr);
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140
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141 URLConnection conn = url.openConnection();
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142 conn.connect();
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143
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144 InputStream is = conn.getInputStream();
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145
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146 return parse(is);
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147 }
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148 catch (MalformedURLException mue) {
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149 logger.warn(mue, mue);
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150 throw new ServerException(ERR_MALFORMED_URL);
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151 }
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152 catch (IOException ioe) {
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153 logger.warn(ioe, ioe);
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154 }
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155
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156 throw new ServerException(ERR_GC_REQUEST_FAILED);
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157 }
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158
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159
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160 protected static Capabilities parse(InputStream is)
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161 throws ServerException
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162 {
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163 logger.debug("GCServiceImpl.parseCapabilitiesResponse");
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164
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165 Document doc = XMLUtils.parseDocument(is, false);
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166
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167 if (doc == null) {
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168 throw new ServerException(ERR_GC_DOC_NOT_VALID);
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169 }
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170
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171 return CapabilitiesParser.parse(doc);
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172 }
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173
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174
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175 public static Capabilities parse(Document doc)
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176 throws ServerException
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177 {
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178 Node capabilities = getCapabilitiesNode(doc);
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179
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180 String title = (String) XMLUtils.xpath(
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181 capabilities,
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182 XPATH_TITLE,
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183 XPathConstants.STRING);
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184
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185 String onlineResource = (String) XMLUtils.xpath(
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186 capabilities,
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187 XPATH_ONLINE_RESOURCE,
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188 XPathConstants.STRING);
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189
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190 String fees = (String) XMLUtils.xpath(
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191 capabilities,
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192 XPATH_FEES,
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193 XPathConstants.STRING);
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194
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195 String accessConstraints = (String) XMLUtils.xpath(
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196 capabilities,
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197 XPATH_ACCESS_CONSTRAINTS,
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198 XPathConstants.STRING);
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199
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200 Node contactInformation = (Node) XMLUtils.xpath(
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201 capabilities,
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202 XPATH_CONTACT_INFORMATION,
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203 XPathConstants.NODE);
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204
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205 ContactInformation ci = parseContactInformation(contactInformation);
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206
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207 logger.debug("Found fees: " + fees);
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208 logger.debug("Found access constraints: " + accessConstraints);
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209
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210 NodeList layerNodes = (NodeList) XMLUtils.xpath(
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211 capabilities,
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212 XPATH_LAYERS,
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213 XPathConstants.NODESET);
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214
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215 List<WMSLayer> layers = parseLayers(layerNodes, onlineResource);
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216
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217 // Parse MIME types of supported return types, e.g. image/jpeg
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218 NodeList mapFormatNodes = (NodeList)
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219 XMLUtils.xpath(capabilities, XPATH_MAP_FORMAT, XPathConstants.NODESET);
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220 List<String> mapFormats = new ArrayList<String>();
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221 for (int n = 0; n < mapFormatNodes.getLength(); n++) {
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222 mapFormats.add(mapFormatNodes.item(n).getTextContent());
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223 }
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224
1417
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225 return new Capabilities(
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226 title,
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227 onlineResource,
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228 ci,
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229 fees,
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230 accessConstraints,
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231 layers,
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232 mapFormats);
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233 }
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234
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235
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236 protected static Node getCapabilitiesNode(Document doc)
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237 throws ServerException {
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238 Node capabilities = (Node) XMLUtils.xpath(
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239 doc,
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240 XPATH_WMS_CAPS,
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241 XPathConstants.NODE);
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242
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243 if (capabilities == null) {
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244 logger.info("No '/WMS_Capabilities' node found.");
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245 logger.info("Try to find a '/WMT_MS_Capabilities' node.");
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246
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247 capabilities = (Node) XMLUtils.xpath(
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248 doc,
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249 XPATH_WMT_CAPS,
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250 XPathConstants.NODE);
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251 }
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252
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253 if (capabilities == null) {
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254 throw new ServerException(ERR_GC_DOC_NOT_VALID);
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255 }
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256
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257 return capabilities;
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258 }
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259
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260
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261 protected static ContactInformation parseContactInformation(Node node) {
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262 String person = (String) XMLUtils.xpath(
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263 node,
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264 XPATH_CI_PERSON,
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265 XPathConstants.STRING);
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266
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267 String organization = (String) XMLUtils.xpath(
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268 node,
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269 XPATH_CI_ORGANIZATION,
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270 XPathConstants.STRING);
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271
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272 String address = (String) XMLUtils.xpath(
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273 node,
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274 XPATH_CI_ADDRESS,
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275 XPathConstants.STRING);
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276
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277 String postcode = (String) XMLUtils.xpath(
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278 node,
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279 XPATH_CI_POSTCODE,
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280 XPathConstants.STRING);
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281
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282 String city = (String) XMLUtils.xpath(
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283 node,
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284 XPATH_CI_CITY,
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285 XPathConstants.STRING);
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286
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287 String phone = (String) XMLUtils.xpath(
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288 node,
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289 XPATH_CI_PHONE,
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290 XPathConstants.STRING);
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291
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292 String email = (String) XMLUtils.xpath(
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293 node,
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294 XPATH_CI_EMAIL,
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295 XPathConstants.STRING);
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296
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297 ContactInformation ci = new ContactInformation();
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298 ci.setPerson(person);
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299 ci.setOrganization(organization);
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300 ci.setAddress(address);
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301 ci.setPostcode(postcode);
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302 ci.setCity(city);
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303 ci.setPhone(phone);
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304 ci.setEmail(email);
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305
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306 return ci;
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307 }
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308
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309
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310 /**
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311 * @param layersNode
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312 * @param onlineResource
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313 *
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314 * @return
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315 */
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316 protected static List<WMSLayer> parseLayers(
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317 NodeList layersNode,
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318 String onlineResource
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319 ) {
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320 int len = layersNode != null ? layersNode.getLength() : 0;
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diff changeset
321
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322 logger.debug("Node has " + len + " layers.");
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323
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324 List<WMSLayer> layers = new ArrayList<WMSLayer>(len);
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325
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326 for (int i = 0; i < len; i++) {
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327 layers.add(parseLayer(layersNode.item(i), onlineResource));
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328 }
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329
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330 return layers;
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331 }
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332
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333
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334 protected static WMSLayer parseLayer(Node layerNode, String onlineResource) {
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335 String title = (String) XMLUtils.xpath(
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336 layerNode,
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337 "Title/text()",
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338 XPathConstants.STRING);
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339
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340 String name = (String) XMLUtils.xpath(
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341 layerNode,
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342 "Name/text()",
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343 XPathConstants.STRING);
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344
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345 logger.debug("Found layer: " + title + "(" + name + ")");
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346
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347 boolean queryable = true;
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348 Node queryableAttr = layerNode.getAttributes().getNamedItem("queryable");
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349 if (queryableAttr != null && queryableAttr.getNodeValue().equals("0")) {
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350 queryable = false;
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351 }
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352
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353 List<String> srs = parseSRS(layerNode);
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354
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355 NodeList layersNodes = (NodeList) XMLUtils.xpath(
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356 layerNode,
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357 "Layer",
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358 XPathConstants.NODESET);
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359
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360 List<WMSLayer> layers = parseLayers(layersNodes, onlineResource);
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361
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362 return new WMSLayer(onlineResource, title, name, srs, layers, queryable);
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363 }
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364
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365
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366 protected static List<String> parseSRS(Node layerNode) {
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367 NodeList srsNodes = ((Element) layerNode).getElementsByTagName("SRS");
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368
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369 if (srsNodes.getLength() == 0) {
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370 srsNodes = ((Element) layerNode).getElementsByTagName("CRS");
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371
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372 if (srsNodes.getLength() == 0) {
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373 logger.debug("No explicit SRS for this layer specified.");
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374 return null;
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375 }
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376 }
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377
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378 List<String> allSRS = new ArrayList<String>();
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379
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380 for (int i = 0, n = srsNodes.getLength(); i < n; i++) {
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381 List<String> srs = parseSRSItem(srsNodes.item(i).getTextContent());
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382
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383 if (srs != null && srs.size() > 0) {
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384 allSRS.addAll(srs);
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385 }
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386 }
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387
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388 return allSRS;
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389 }
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390
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391
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392 protected static List<String> parseSRSItem(String srsStr) {
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393 if (srsStr == null || srsStr.length() == 0) {
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394 return null;
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395 }
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396
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397 List<String> allSRS = new ArrayList<String>();
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398
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399 if (srsStr.indexOf(" ") <= 0) {
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400 String srs = getSRSFromString(srsStr);
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401 if (srs != null && srs.length() > 0) {
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402 allSRS.add(srs);
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403 }
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404
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405 return allSRS;
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406 }
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diff changeset
407
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408 String[] splittedSrs = srsStr.split(" ");
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409
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diff changeset
410 for (String singleSrs: splittedSrs) {
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411 String srs = getSRSFromString(singleSrs);
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412 if (srs != null && srs.length() > 0) {
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413 allSRS.add(srs);
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414 }
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415 }
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416
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417 return allSRS;
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418 }
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419
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420
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421 protected static String getSRSFromString(String singleSrs) {
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422 Matcher m = SRS_PATTERN.matcher(singleSrs);
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423
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424 if (m.matches()) {
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425 logger.debug("Found SRS '" + m.group(1) + "'");
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426 return m.group(1);
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427 }
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428
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429 return null;
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430 }
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431 }
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432 // vim:set ts=4 sw=4 si et sta sts=4 fenc=utf8 :
http://dive4elements.wald.intevation.org