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annotate flys-client/src/main/java/de/intevation/flys/client/server/GCServiceImpl.java @ 1416:16f19f12a962

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Improved parsing of Capabilities document - parse '/WMT_MS_Capabilities' as well. flys-client/trunk@3306 c6561f87-3c4e-4783-a992-168aeb5c3f6f
author Ingo Weinzierl <ingo.weinzierl@intevation.de>
date Wed, 23 Nov 2011 09:45:22 +0000
parents 3484cbfaf369
children 42d6cf6e10b7
rev   line source
1408
5b5a20e4c4e5 Added a service that loads the Capabilities of a specified WMS - display those information in the ExternalWMSWindow.
Ingo Weinzierl <ingo.weinzierl@intevation.de>
parents:
diff changeset
1 package de.intevation.flys.client.server;
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2
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3 import java.io.InputStream;
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4 import java.io.IOException;
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5 import java.net.MalformedURLException;
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6 import java.net.URL;
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7 import java.net.URLConnection;
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8 import java.util.ArrayList;
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9 import java.util.List;
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10
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11 import javax.xml.xpath.XPathConstants;
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12
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13 import com.google.gwt.user.server.rpc.RemoteServiceServlet;
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14
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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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18
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19 import org.apache.log4j.Logger;
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20
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21 import de.intevation.artifacts.common.utils.XMLUtils;
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22
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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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27 import de.intevation.flys.client.client.services.GCService;
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28
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29
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30 /**
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31 * @author <a href="mailto:ingo.weinzierl@intevation.de">Ingo Weinzierl</a>
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32 */
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33 public class GCServiceImpl
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34 extends RemoteServiceServlet
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35 implements GCService
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36 {
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37 public static final String ERR_GC_REQUEST_FAILED =
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38 "error_gc_req_failed";
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39
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40 public static final String ERR_GC_DOC_NOT_VALID =
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41 "error_gc_doc_not_valid";
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42
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43 public static final String ERR_MALFORMED_URL =
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44 "error_malformed_url";
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45
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46 public static final String XPATH_WMS_CAPS =
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47 "/WMS_Capabilities";
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48
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49 public static final String XPATH_WMT_CAPS =
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50 "/WMT_MS_Capabilities";
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51
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52 public static final String XPATH_TITLE =
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53 "Service/Title/text()";
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54
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55 public static final String XPATH_ONLINE_RESOURCE =
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56 "Service/OnlineResource/@href";
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57
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58 public static final String XPATH_CONTACT_INFORMATION =
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59 "Service/ContactInformation";
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60
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61 public static final String XPATH_CI_PERSON =
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62 "ContactPersonPrimary/ContactPerson/text()";
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63
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64 public static final String XPATH_CI_ORGANIZATION =
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65 "ContactPersonPrimary/ContactOrganization/text()";
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66
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67 public static final String XPATH_CI_ADDRESS =
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68 "ContactAddress/Address/text()";
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69
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70 public static final String XPATH_CI_CITY =
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71 "ContactAddress/City/text()";
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72
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73 public static final String XPATH_CI_POSTCODE =
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74 "ContactAddress/PostCode/text()";
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75
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76 public static final String XPATH_CI_PHONE =
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77 "ContactVoiceTelephone/text()";
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78
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79 public static final String XPATH_CI_EMAIL =
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80 "ContactElectronicMailAddress/text()";
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81
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82 public static final String XPATH_FEES =
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83 "Service/Fees/text()";
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84
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85 public static final String XPATH_ACCESS_CONSTRAINTS =
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86 "Service/AccessConstraints/text()";
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87
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88 public static final String XPATH_LAYERS =
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89 "Capability/Layer";
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90
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91
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92 private Logger logger = Logger.getLogger(GCServiceImpl.class);
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93
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94
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95 public Capabilities query(String path)
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96 throws ServerException
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97 {
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98 logger.info("GCServiceImpl.query");
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99
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100 try {
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101 URL url = new URL(path);
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102
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103 logger.debug("Open connection to url: " + path);
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104
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105 URLConnection conn = url.openConnection();
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106 conn.connect();
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107
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108 InputStream is = conn.getInputStream();
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109
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110 return parseCapabilitiesResponse(is);
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111 }
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112 catch (MalformedURLException mue) {
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113 logger.warn(mue, mue);
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114 throw new ServerException(ERR_MALFORMED_URL);
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115 }
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116 catch (IOException ioe) {
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117 logger.warn(ioe, ioe);
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118 }
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119
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120 throw new ServerException(ERR_GC_REQUEST_FAILED);
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121 }
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122
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123
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124 protected Capabilities parseCapabilitiesResponse(InputStream is)
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125 throws ServerException
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126 {
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127 logger.debug("GCServiceImpl.parseCapabilitiesResponse");
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128
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129 Document doc = XMLUtils.parseDocument(is, false);
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130
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131 if (doc == null) {
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132 throw new ServerException(ERR_GC_DOC_NOT_VALID);
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133 }
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134
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135 Node capabilities = getCapabilitiesNode(doc);
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136
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137 String title = (String) XMLUtils.xpath(
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138 capabilities,
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139 XPATH_TITLE,
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140 XPathConstants.STRING);
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141
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142 String onlineResource = (String) XMLUtils.xpath(
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143 capabilities,
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144 XPATH_ONLINE_RESOURCE,
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145 XPathConstants.STRING);
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146
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147 String fees = (String) XMLUtils.xpath(
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148 capabilities,
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149 XPATH_FEES,
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150 XPathConstants.STRING);
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151
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152 String accessConstraints = (String) XMLUtils.xpath(
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153 capabilities,
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154 XPATH_ACCESS_CONSTRAINTS,
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155 XPathConstants.STRING);
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156
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157 Node contactInformation = (Node) XMLUtils.xpath(
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158 capabilities,
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159 XPATH_CONTACT_INFORMATION,
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160 XPathConstants.NODE);
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161
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162 ContactInformation ci = parseContactInformation(contactInformation);
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163
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164 logger.debug("Found fees: " + fees);
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165 logger.debug("Found access constraints: " + accessConstraints);
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166
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167 NodeList layerNodes = (NodeList) XMLUtils.xpath(
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168 capabilities,
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169 XPATH_LAYERS,
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170 XPathConstants.NODESET);
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171
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172 List<WMSLayer> layers = parseLayers(layerNodes, onlineResource);
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173
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174 return new Capabilities(
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175 title,
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176 onlineResource,
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177 ci,
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178 fees,
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179 accessConstraints,
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180 layers);
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181 }
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182
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183
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184 protected Node getCapabilitiesNode(Document doc)
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185 throws ServerException {
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186 Node capabilities = (Node) XMLUtils.xpath(
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187 doc,
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188 XPATH_WMS_CAPS,
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189 XPathConstants.NODE);
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190
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191 if (capabilities == null) {
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192 logger.info("No '/WMS_Capabilities' node found.");
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193 logger.info("Try to find a '/WMT_MS_Capabilities' node.");
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194
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195 capabilities = (Node) XMLUtils.xpath(
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196 doc,
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197 XPATH_WMT_CAPS,
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198 XPathConstants.NODE);
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199 }
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200
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201 if (capabilities == null) {
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202 throw new ServerException(ERR_GC_DOC_NOT_VALID);
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203 }
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204
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205 return capabilities;
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206 }
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207
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208
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209 protected ContactInformation parseContactInformation(Node node) {
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210 String person = (String) XMLUtils.xpath(
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211 node,
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212 XPATH_CI_PERSON,
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213 XPathConstants.STRING);
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214
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215 String organization = (String) XMLUtils.xpath(
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216 node,
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217 XPATH_CI_ORGANIZATION,
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218 XPathConstants.STRING);
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219
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220 String address = (String) XMLUtils.xpath(
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221 node,
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222 XPATH_CI_ADDRESS,
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223 XPathConstants.STRING);
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224
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225 String postcode = (String) XMLUtils.xpath(
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226 node,
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227 XPATH_CI_POSTCODE,
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228 XPathConstants.STRING);
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229
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230 String city = (String) XMLUtils.xpath(
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231 node,
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232 XPATH_CI_CITY,
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233 XPathConstants.STRING);
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234
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235 String phone = (String) XMLUtils.xpath(
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236 node,
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237 XPATH_CI_PHONE,
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238 XPathConstants.STRING);
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239
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240 String email = (String) XMLUtils.xpath(
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241 node,
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242 XPATH_CI_EMAIL,
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243 XPathConstants.STRING);
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244
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245 ContactInformation ci = new ContactInformation();
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246 ci.setPerson(person);
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247 ci.setOrganization(organization);
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248 ci.setAddress(address);
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249 ci.setPostcode(postcode);
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250 ci.setCity(city);
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251 ci.setPhone(phone);
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252 ci.setEmail(email);
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253
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254 return ci;
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255 }
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256
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257
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258 /**
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259 * @param layersNode
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260 * @param onlineResource
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261 *
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262 * @return
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263 */
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264 protected List<WMSLayer> parseLayers(
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265 NodeList layersNode,
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266 String onlineResource
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267 ) {
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268 int len = layersNode != null ? layersNode.getLength() : 0;
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269
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270 logger.debug("Node has " + len + " layers.");
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271
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272 List<WMSLayer> layers = new ArrayList<WMSLayer>(len);
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273
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274 for (int i = 0; i < len; i++) {
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275 layers.add(parseLayer(layersNode.item(i), onlineResource));
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276 }
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277
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278 return layers;
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279 }
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280
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281
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282 protected WMSLayer parseLayer(Node layerNode, String onlineResource) {
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283 String title = (String) XMLUtils.xpath(
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284 layerNode,
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285 "Title/text()",
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286 XPathConstants.STRING);
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287
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288 String name = (String) XMLUtils.xpath(
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289 layerNode,
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290 "Name/text()",
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291 XPathConstants.STRING);
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292
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293 logger.debug("Found layers: " + title + "(" + name + ")");
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294
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295 NodeList layersNodes = (NodeList) XMLUtils.xpath(
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296 layerNode,
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297 "Layer",
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298 XPathConstants.NODESET);
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299
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300 List<WMSLayer> layers = parseLayers(layersNodes, onlineResource);
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301
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302 return new WMSLayer(onlineResource, title, name, layers);
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303 }
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304 }
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305 // vim:set ts=4 sw=4 si et sta sts=4 fenc=utf8 :
http://dive4elements.wald.intevation.org