svn-gvsig-desktop / tags / v2_0_0_Build_2020 / libraries / libRemoteServices / src / org / gvsig / remoteclient / wfs / WFSProtocolHandlerFactory.java @ 33910
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1 | 29650 | jpiera | package org.gvsig.remoteclient.wfs; |
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2 | 4887 | jorpiell | |
3 | 15505 | jpiera | import java.io.File; |
4 | import java.io.FileReader; |
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5 | 4887 | jorpiell | import java.io.IOException; |
6 | 15505 | jpiera | import java.io.Reader; |
7 | 4887 | jorpiell | import java.net.ConnectException; |
8 | import java.net.URL; |
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9 | import java.util.ArrayList; |
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10 | import java.util.Iterator; |
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11 | |||
12 | 33738 | jpiera | import org.kxml2.io.KXmlParser; |
13 | import org.xmlpull.v1.XmlPullParserException; |
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14 | |||
15 | import org.gvsig.compat.CompatLocator; |
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16 | import org.gvsig.compat.lang.StringUtils; |
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17 | 29650 | jpiera | import org.gvsig.remoteclient.utils.CapabilitiesTags; |
18 | import org.gvsig.remoteclient.utils.EncodingXMLParser; |
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19 | import org.gvsig.remoteclient.utils.Utilities; |
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20 | 4887 | jorpiell | |
21 | /* gvSIG. Sistema de Informaci?n Geogr?fica de la Generalitat Valenciana
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22 | *
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23 | * Copyright (C) 2004 IVER T.I. and Generalitat Valenciana.
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24 | *
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25 | * This program is free software; you can redistribute it and/or
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26 | * modify it under the terms of the GNU General Public License
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27 | * as published by the Free Software Foundation; either version 2
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28 | * of the License, or (at your option) any later version.
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29 | *
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30 | * This program is distributed in the hope that it will be useful,
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31 | * but WITHOUT ANY WARRANTY; without even the implied warranty of
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32 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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33 | * GNU General Public License for more details.
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34 | *
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35 | * You should have received a copy of the GNU General Public License
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36 | * along with this program; if not, write to the Free Software
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37 | * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307,USA.
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38 | *
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39 | * For more information, contact:
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40 | *
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41 | * Generalitat Valenciana
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42 | * Conselleria d'Infraestructures i Transport
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43 | * Av. Blasco Ib??ez, 50
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44 | * 46010 VALENCIA
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45 | * SPAIN
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46 | *
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47 | * +34 963862235
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48 | * gvsig@gva.es
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49 | * www.gvsig.gva.es
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50 | *
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51 | * or
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52 | *
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53 | * IVER T.I. S.A
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54 | * Salamanca 50
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55 | * 46005 Valencia
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56 | * Spain
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57 | *
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58 | * +34 963163400
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59 | * dac@iver.es
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60 | */
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61 | /* CVS MESSAGES:
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62 | *
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63 | * $Id$
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64 | * $Log$
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65 | 10246 | jorpiell | * Revision 1.2 2007-02-09 14:11:01 jorpiell
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66 | * Primer piloto del soporte para WFS 1.1 y para WFS-T
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67 | *
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68 | * Revision 1.1 2006/04/19 12:51:35 jorpiell
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69 | 4887 | jorpiell | * A?adidas algunas de las clases del servicio WFS
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70 | *
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71 | *
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72 | */
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73 | /**
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74 | * @author Jorge Piera Llodr? (piera_jor@gva.es)
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75 | */
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76 | public class WFSProtocolHandlerFactory { |
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77 | public WFSProtocolHandler wFSProtocolHandler;
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78 | 33738 | jpiera | private static final StringUtils stringUtils = CompatLocator.getStringUtils(); |
79 | 4887 | jorpiell | private static ArrayList supportedVersions = new ArrayList(); |
80 | |||
81 | static {
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82 | supportedVersions.add("1.0.0");
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83 | 10246 | jorpiell | supportedVersions.add("1.1.0");
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84 | 4887 | jorpiell | } |
85 | |||
86 | /**
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87 | * M?todo que dada una respuesta de getCapabilities y un iterador sobre una
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88 | * coleccion de WFSClient's ordenada descendentemente devuelve el cliente
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89 | * cuya version es igual o inmediatamente inferior
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90 | *
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91 | * @param caps Capabilities con la respuesta del servidor
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92 | * @param clients Iterador de conjunto ordenado descendientemente
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93 | *
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94 | * @return cliente cuya version es igual o inmediatamente inferior
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95 | * @throws IllegalAccessException
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96 | * @throws InstantiationException
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97 | *
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98 | */
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99 | private static String getDriverVersion(String version, Iterator clients) throws InstantiationException, IllegalAccessException { |
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100 | while (clients.hasNext()) {
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101 | String clientVersion = (String)clients.next(); |
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102 | int ret = version.compareTo(clientVersion);
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103 | |||
104 | if (ret >= 0) { |
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105 | return clientVersion;
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106 | } |
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107 | } |
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108 | return null; |
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109 | } |
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110 | |||
111 | /**
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112 | * Establece la versi?n con la que se comunicar? con el servidor y devuelve
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113 | * el objeto Capabilities obtenido con dicha versi?n
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114 | *
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115 | * @param host maquina con la que se negocia
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116 | *
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117 | * @return instancia de un cliente capaz de negociar con el host que se
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118 | * pasa como par?metro
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119 | */
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120 | public static WFSProtocolHandler negotiate(String host) throws ConnectException, IOException { |
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121 | |||
122 | if (supportedVersions.size() == 0){ |
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123 | return null; |
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124 | } |
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125 | |||
126 | try {
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127 | String highestVersionSupportedByServer = getSuitableWFSVersion(host,""); |
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128 | if (supportedVersions.contains(highestVersionSupportedByServer))
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129 | { |
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130 | // we support the highest version supported by the server
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131 | // this is the best case
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132 | return createVersionDriver(highestVersionSupportedByServer);
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133 | } |
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134 | else
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135 | { |
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136 | // in case we dont support the highest version from the server
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137 | // we start the negotiation process in which we have to get the higest version
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138 | // the WFS supports and we are able to read.
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139 | Iterator iVersion = supportedVersions.iterator();
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140 | String wfsVersion;
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141 | String gvSIGVersion;
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142 | |||
143 | while (iVersion.hasNext()) {
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144 | gvSIGVersion = (String)iVersion.next();
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145 | wfsVersion = getSuitableWFSVersion(host,gvSIGVersion); |
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146 | //TODO:
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147 | //compare with the version returned by the WMS!!!!!
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148 | // send GetCapabilities and read the version to compare.
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149 | int res = wfsVersion.compareTo(gvSIGVersion);
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150 | |||
151 | if (res == 0) { //Si es la misma que nuestra version |
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152 | return createVersionDriver(gvSIGVersion);
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153 | } else if (res > 0) { //Si es mayor que nuestra version |
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154 | throw new Exception("Server Version too high: " + wfsVersion); |
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155 | } else { //Si es menor que nuestra version |
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156 | //Obtenemos la primera version menor o igual que tengamos
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157 | String lowerVersion = WFSProtocolHandlerFactory.getDriverVersion(wfsVersion, iVersion);
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158 | |||
159 | if (lowerVersion == null) { //Si no hay ninguna |
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160 | throw new Exception("Lowest server version is " + wfsVersion); |
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161 | } else {
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162 | if (lowerVersion.equals(wfsVersion)) {
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163 | return createVersionDriver(lowerVersion);
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164 | } else { //Si hay una version menor que la que retorno el servidor |
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165 | //iV = lower;
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166 | } |
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167 | } |
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168 | } |
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169 | } |
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170 | }//case we had to start the negotiation process.
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171 | return null; // if it did not find any suitable version. |
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172 | } |
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173 | catch(ConnectException conEx) |
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174 | { |
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175 | throw conEx;
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176 | } |
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177 | catch(IOException ioEx) |
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178 | { |
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179 | throw ioEx;
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180 | } |
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181 | catch(Exception e) |
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182 | { |
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183 | e.printStackTrace(); |
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184 | return null; |
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185 | } |
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186 | } |
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187 | |||
188 | /**
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189 | * Sends a GetCapabilities to the WFS server to get the version
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190 | * if the version parameter is null, the WFS will return the highest version supported
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191 | * if not it will return the lower highest version than the one requested.
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192 | * @param host
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193 | * @param version
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194 | * @return suitable version supported by the server
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195 | */
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196 | private static String getSuitableWFSVersion(String host, String _version) throws ConnectException, IOException { |
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197 | String request = WFSProtocolHandler.buildCapabilitiesSuitableVersionRequest(host, _version);
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198 | String version = new String(); |
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199 | 15505 | jpiera | Reader reader = null; |
200 | 4887 | jorpiell | try {
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201 | 15505 | jpiera | File file = Utilities.downloadFile(new URL(request), "wfs-suitable-version", null); |
202 | |||
203 | reader = new FileReader(file); |
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204 | EncodingXMLParser kxmlParser = new EncodingXMLParser();
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205 | 4887 | jorpiell | kxmlParser.setInput(reader); |
206 | kxmlParser.nextTag(); |
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207 | if ( kxmlParser.getEventType() != KXmlParser.END_DOCUMENT ) {
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208 | 10246 | jorpiell | String tag = kxmlParser.getName();
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209 | 33738 | jpiera | if (stringUtils.split(tag, ":").length == 2){ |
210 | tag = stringUtils.split(tag, ":")[1]; |
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211 | 10246 | jorpiell | } |
212 | if ((tag.compareTo(CapabilitiesTags.WFS_CAPABILITIES_ROOT1_0_0)==0)) { |
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213 | 4887 | jorpiell | version = kxmlParser.getAttributeValue("", CapabilitiesTags.VERSION);
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214 | } |
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215 | } |
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216 | // do not forget to close the Stream.
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217 | 15505 | jpiera | reader.close(); |
218 | 4887 | jorpiell | return version;
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219 | } catch(ConnectException conEx) { |
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220 | throw new ConnectException(conEx.getMessage()); |
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221 | } catch(IOException ioEx) { |
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222 | throw new IOException(ioEx.getMessage()); |
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223 | } catch(XmlPullParserException xmlEx) {
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224 | xmlEx.printStackTrace(); |
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225 | return ""; |
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226 | } finally {
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227 | if (reader != null) { |
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228 | try {
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229 | reader.close(); |
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230 | } catch(Exception ex) { |
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231 | ex.printStackTrace(); |
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232 | } |
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233 | } |
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234 | } |
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235 | } |
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236 | |||
237 | /**
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238 | * It creates an instance of a WFSDriver class.
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239 | *
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240 | * @param String, with the version of the driver to be created
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241 | * @return WFSDriver.
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242 | */
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243 | 27881 | jpiera | public static WFSProtocolHandler createVersionDriver(String version) { |
244 | 4887 | jorpiell | try {
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245 | Class driver;
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246 | version = version.replace('.', '_'); |
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247 | 29650 | jpiera | driver = Class.forName("org.gvsig.remoteclient.wfs.wfs_"+version+".WFSProtocolHandler" + version); |
248 | 4887 | jorpiell | return (WFSProtocolHandler)driver.newInstance();
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249 | } catch (Exception e) { |
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250 | e.printStackTrace(); |
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251 | //throw new Exception("WFSDriverFactory. Unknown driver version " + e);
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252 | return null; |
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253 | } |
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254 | } |
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255 | |||
256 | |||
257 | |||
258 | } |