svn-gvsig-desktop / trunk / org.gvsig.desktop / org.gvsig.desktop.compat.cdc / org.gvsig.remoteclient / src / main / java / org / gvsig / remoteclient / wfs / WFSProtocolHandlerFactory.java @ 40559
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1 | 40559 | jjdelcerro | /**
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2 | * gvSIG. Desktop Geographic Information System.
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3 | *
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4 | * Copyright (C) 2007-2013 gvSIG Association.
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5 | *
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6 | * This program is free software; you can redistribute it and/or
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7 | * modify it under the terms of the GNU General Public License
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8 | * as published by the Free Software Foundation; either version 3
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9 | * of the License, or (at your option) any later version.
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10 | *
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11 | * This program is distributed in the hope that it will be useful,
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12 | * but WITHOUT ANY WARRANTY; without even the implied warranty of
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13 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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14 | * GNU General Public License for more details.
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15 | *
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16 | * You should have received a copy of the GNU General Public License
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17 | * along with this program; if not, write to the Free Software
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18 | * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston,
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19 | * MA 02110-1301, USA.
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20 | *
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21 | * For any additional information, do not hesitate to contact us
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22 | * at info AT gvsig.com, or visit our website www.gvsig.com.
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23 | */
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24 | 40435 | jjdelcerro | package org.gvsig.remoteclient.wfs; |
25 | |||
26 | import java.io.File; |
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27 | import java.io.FileReader; |
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28 | import java.io.IOException; |
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29 | import java.io.Reader; |
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30 | import java.net.ConnectException; |
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31 | import java.net.URL; |
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32 | import java.util.ArrayList; |
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33 | import java.util.Iterator; |
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34 | import java.util.List; |
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35 | |||
36 | import org.kxml2.io.KXmlParser; |
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37 | import org.xmlpull.v1.XmlPullParserException; |
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38 | |||
39 | import org.gvsig.compat.CompatLocator; |
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40 | import org.gvsig.compat.lang.StringUtils; |
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41 | import org.gvsig.remoteclient.utils.CapabilitiesTags; |
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42 | import org.gvsig.remoteclient.utils.EncodingXMLParser; |
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43 | import org.gvsig.remoteclient.utils.Utilities; |
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44 | |||
45 | /* gvSIG. Sistema de Informaci?n Geogr?fica de la Generalitat Valenciana
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46 | *
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47 | * Copyright (C) 2004 IVER T.I. and Generalitat Valenciana.
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48 | *
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49 | * This program is free software; you can redistribute it and/or
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50 | * modify it under the terms of the GNU General Public License
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51 | * as published by the Free Software Foundation; either version 2
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52 | * of the License, or (at your option) any later version.
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53 | *
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54 | * This program is distributed in the hope that it will be useful,
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55 | * but WITHOUT ANY WARRANTY; without even the implied warranty of
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56 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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57 | * GNU General Public License for more details.
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58 | *
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59 | * You should have received a copy of the GNU General Public License
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60 | * along with this program; if not, write to the Free Software
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61 | * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307,USA.
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62 | *
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63 | * For more information, contact:
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64 | *
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65 | * Generalitat Valenciana
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66 | * Conselleria d'Infraestructures i Transport
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67 | * Av. Blasco Ib??ez, 50
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68 | * 46010 VALENCIA
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69 | * SPAIN
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70 | *
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71 | * +34 963862235
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72 | * gvsig@gva.es
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73 | * www.gvsig.gva.es
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74 | *
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75 | * or
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76 | *
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77 | * IVER T.I. S.A
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78 | * Salamanca 50
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79 | * 46005 Valencia
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80 | * Spain
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81 | *
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82 | * +34 963163400
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83 | * dac@iver.es
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84 | */
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85 | /* CVS MESSAGES:
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86 | *
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87 | * $Id: WFSProtocolHandlerFactory.java 39768 2013-02-20 14:16:29Z jldominguez $
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88 | * $Log$
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89 | * Revision 1.2 2007-02-09 14:11:01 jorpiell
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90 | * Primer piloto del soporte para WFS 1.1 y para WFS-T
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91 | *
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92 | * Revision 1.1 2006/04/19 12:51:35 jorpiell
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93 | * A?adidas algunas de las clases del servicio WFS
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94 | *
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95 | *
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96 | */
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97 | /**
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98 | * @author Jorge Piera Llodr? (piera_jor@gva.es)
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99 | */
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100 | public class WFSProtocolHandlerFactory { |
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101 | public WFSProtocolHandler wFSProtocolHandler;
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102 | private static final StringUtils stringUtils = CompatLocator.getStringUtils(); |
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103 | private static ArrayList supportedVersions = new ArrayList(); |
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104 | |||
105 | static {
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106 | supportedVersions.add("1.1.0");
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107 | supportedVersions.add("1.0.0");
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108 | } |
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109 | |||
110 | /**
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111 | * M?todo que dada una respuesta de getCapabilities y un iterador sobre una
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112 | * coleccion de WFSClient's ordenada descendentemente devuelve el cliente
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113 | * cuya version es igual o inmediatamente inferior
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114 | *
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115 | * @param caps Capabilities con la respuesta del servidor
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116 | * @param clients Iterador de conjunto ordenado descendientemente
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117 | *
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118 | * @return cliente cuya version es igual o inmediatamente inferior
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119 | * @throws IllegalAccessException
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120 | * @throws InstantiationException
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121 | *
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122 | */
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123 | private static String getDriverVersion(String version, Iterator clients) throws InstantiationException, IllegalAccessException { |
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124 | while (clients.hasNext()) {
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125 | String clientVersion = (String)clients.next(); |
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126 | int ret = version.compareTo(clientVersion);
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127 | |||
128 | if (ret >= 0) { |
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129 | return clientVersion;
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130 | } |
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131 | } |
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132 | return null; |
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133 | } |
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134 | |||
135 | /**
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136 | * Establece la versi?n con la que se comunicar? con el servidor y devuelve
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137 | * el objeto Capabilities obtenido con dicha versi?n
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138 | *
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139 | * @param host maquina con la que se negocia
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140 | *
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141 | * @return instancia de un cliente capaz de negociar con el host que se
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142 | * pasa como par?metro
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143 | */
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144 | public static WFSProtocolHandler negotiate(String host) throws ConnectException, IOException { |
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145 | |||
146 | if (supportedVersions.size() == 0){ |
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147 | return null; |
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148 | } |
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149 | |||
150 | try {
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151 | String highestVersionSupportedByServer = getSuitableWFSVersion(host,""); |
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152 | if (supportedVersions.contains(highestVersionSupportedByServer))
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153 | { |
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154 | // we support the highest version supported by the server
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155 | // this is the best case
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156 | return createVersionDriver(highestVersionSupportedByServer);
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157 | } |
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158 | else
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159 | { |
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160 | // in case we dont support the highest version from the server
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161 | // we start the negotiation process in which we have to get the higest version
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162 | // the WFS supports and we are able to read.
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163 | Iterator iVersion = supportedVersions.iterator();
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164 | String wfsVersion;
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165 | String gvSIGVersion;
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166 | |||
167 | while (iVersion.hasNext()) {
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168 | gvSIGVersion = (String)iVersion.next();
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169 | wfsVersion = getSuitableWFSVersion(host,gvSIGVersion); |
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170 | //TODO:
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171 | //compare with the version returned by the WMS!!!!!
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172 | // send GetCapabilities and read the version to compare.
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173 | int res = wfsVersion.compareTo(gvSIGVersion);
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174 | |||
175 | if (res == 0) { //Si es la misma que nuestra version |
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176 | return createVersionDriver(gvSIGVersion);
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177 | } else if (res > 0) { //Si es mayor que nuestra version |
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178 | throw new Exception("Server Version too high: " + wfsVersion); |
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179 | } else { //Si es menor que nuestra version |
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180 | //Obtenemos la primera version menor o igual que tengamos
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181 | String lowerVersion = WFSProtocolHandlerFactory.getDriverVersion(wfsVersion, iVersion);
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182 | |||
183 | if (lowerVersion == null) { //Si no hay ninguna |
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184 | throw new Exception("Lowest server version is " + wfsVersion); |
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185 | } else {
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186 | if (lowerVersion.equals(wfsVersion)) {
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187 | return createVersionDriver(lowerVersion);
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188 | } else { //Si hay una version menor que la que retorno el servidor |
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189 | //iV = lower;
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190 | } |
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191 | } |
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192 | } |
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193 | } |
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194 | }//case we had to start the negotiation process.
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195 | return null; // if it did not find any suitable version. |
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196 | } |
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197 | catch(ConnectException conEx) |
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198 | { |
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199 | throw conEx;
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200 | } |
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201 | catch(IOException ioEx) |
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202 | { |
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203 | throw ioEx;
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204 | } |
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205 | catch(Exception e) |
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206 | { |
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207 | e.printStackTrace(); |
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208 | return null; |
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209 | } |
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210 | } |
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211 | |||
212 | /**
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213 | * Sends a GetCapabilities to the WFS server to get the version
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214 | * if the version parameter is null, the WFS will return the highest version supported
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215 | * if not it will return the lower highest version than the one requested.
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216 | * @param host
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217 | * @param version
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218 | * @return suitable version supported by the server
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219 | */
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220 | private static String getSuitableWFSVersion(String host, String _version) throws ConnectException, IOException { |
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221 | String request = WFSProtocolHandler.buildCapabilitiesSuitableVersionRequest(host, _version);
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222 | String version = new String(); |
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223 | Reader reader = null; |
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224 | try {
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225 | File file = Utilities.downloadFile(new URL(request), "wfs-suitable-version", null); |
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226 | |||
227 | reader = new FileReader(file); |
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228 | EncodingXMLParser kxmlParser = new EncodingXMLParser();
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229 | kxmlParser.setInput(reader); |
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230 | kxmlParser.nextTag(); |
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231 | if ( kxmlParser.getEventType() != KXmlParser.END_DOCUMENT ) {
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232 | String tag = kxmlParser.getName();
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233 | if (stringUtils.split(tag, ":").length == 2){ |
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234 | tag = stringUtils.split(tag, ":")[1]; |
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235 | } |
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236 | if ((tag.compareTo(CapabilitiesTags.WFS_CAPABILITIES_ROOT1_0_0)==0)) { |
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237 | version = kxmlParser.getAttributeValue("", CapabilitiesTags.VERSION);
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238 | } |
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239 | } |
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240 | // do not forget to close the Stream.
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241 | reader.close(); |
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242 | return version;
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243 | } catch(ConnectException conEx) { |
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244 | throw new ConnectException(conEx.getMessage()); |
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245 | } catch(IOException ioEx) { |
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246 | throw new IOException(ioEx.getMessage()); |
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247 | } catch(XmlPullParserException xmlEx) {
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248 | xmlEx.printStackTrace(); |
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249 | return ""; |
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250 | } finally {
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251 | if (reader != null) { |
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252 | try {
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253 | reader.close(); |
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254 | } catch(Exception ex) { |
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255 | ex.printStackTrace(); |
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256 | } |
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257 | } |
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258 | } |
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259 | } |
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260 | |||
261 | /**
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262 | * Gets the intersection between the versions supported by the server
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263 | * and the versions supported by the application
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264 | * @throws IOException
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265 | * @throws ConnectException
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266 | */
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267 | public static List getRequestableVersions(String host) throws |
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268 | ConnectException, IOException { |
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269 | |||
270 | Iterator iVersion = supportedVersions.iterator();
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271 | String wfsVersion;
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272 | String gvSIGVersion;
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273 | |||
274 | ArrayList resp = new ArrayList(); |
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275 | |||
276 | while (iVersion.hasNext()) {
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277 | gvSIGVersion = (String)iVersion.next();
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278 | wfsVersion = getSuitableWFSVersion(host,gvSIGVersion); |
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279 | if (gvSIGVersion.compareTo(wfsVersion) == 0) { |
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280 | resp.add(gvSIGVersion); |
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281 | } |
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282 | } |
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283 | return resp;
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284 | } |
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285 | |||
286 | /**
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287 | * It creates an instance of a WFSDriver class.
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288 | *
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289 | * @param String, with the version of the driver to be created
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290 | * @return WFSDriver.
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291 | */
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292 | public static WFSProtocolHandler createVersionDriver(String version) { |
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293 | try {
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294 | Class driver;
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295 | version = version.replace('.', '_'); |
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296 | driver = Class.forName("org.gvsig.remoteclient.wfs.wfs_"+version+".WFSProtocolHandler" + version); |
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297 | return (WFSProtocolHandler)driver.newInstance();
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298 | } catch (Exception e) { |
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299 | e.printStackTrace(); |
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300 | //throw new Exception("WFSDriverFactory. Unknown driver version " + e);
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301 | return null; |
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302 | } |
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303 | } |
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304 | |||
305 | |||
306 | |||
307 | } |