svn-gvsig-desktop / trunk / org.gvsig.desktop / org.gvsig.desktop.compat.cdc / org.gvsig.remoteclient / src / main / java / org / gvsig / remoteclient / wms / WMSProtocolHandlerFactory.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 | |
25 | package org.gvsig.remoteclient.wms; |
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26 | |||
27 | import java.io.DataInputStream; |
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28 | import java.io.IOException; |
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29 | import java.io.StringReader; |
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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 | |||
35 | import org.kxml2.io.KXmlParser; |
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36 | import org.xmlpull.v1.XmlPullParserException; |
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37 | |||
38 | import org.gvsig.remoteclient.utils.CapabilitiesTags; |
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39 | |||
40 | /**
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41 | * <p></p>
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42 | *
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43 | */
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44 | public class WMSProtocolHandlerFactory { |
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45 | /**
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46 | * <p></p>
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47 | *
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48 | */
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49 | public org.gvsig.remoteclient.wms.WMSProtocolHandler wMSProtocolHandler;
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50 | |||
51 | private static ArrayList supportedVersions = new ArrayList(); |
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52 | |||
53 | static {
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54 | /*
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55 | * Se meten en el array versions las distintas versiones
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56 | * del protocolo en orden descendente
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57 | */
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58 | //versions.add(WMSProtocolHandler1_3_0.class);
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59 | //versions.add(WMSProtocolHandler1_1_1.class);
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60 | supportedVersions.add("1.3.0");
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61 | supportedVersions.add("1.1.1");
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62 | supportedVersions.add("1.1.0");
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63 | } |
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64 | |||
65 | /**
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66 | * M?todo que dada una respuesta de getCapabilities y un iterador sobre una
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67 | * coleccion de WMSClient's ordenada descendentemente devuelve el cliente
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68 | * cuya version es igual o inmediatamente inferior
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69 | *
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70 | * @param caps Capabilities con la respuesta del servidor
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71 | * @param clients Iterador de conjunto ordenado descendientemente
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72 | *
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73 | * @return cliente cuya version es igual o inmediatamente inferior
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74 | * @throws IllegalAccessException
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75 | * @throws InstantiationException
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76 | *
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77 | */
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78 | private static String getDriverVersion(String version, Iterator clients) throws InstantiationException, IllegalAccessException { |
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79 | while (clients.hasNext()) {
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80 | String clientVersion = (String)clients.next(); |
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81 | int ret = version.compareTo(clientVersion);
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82 | |||
83 | if (ret >= 0) { |
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84 | return clientVersion;
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85 | } |
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86 | } |
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87 | return null; |
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88 | } |
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89 | |||
90 | /**
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91 | * Establece la versi?n con la que se comunicar? con el servidor y devuelve
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92 | * el objeto Capabilities obtenido con dicha versi?n
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93 | *
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94 | * @param host maquina con la que se negocia
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95 | *
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96 | * @return instancia de un cliente capaz de negociar con el host que se
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97 | * pasa como par?metro
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98 | */
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99 | public static WMSProtocolHandler negotiate(String host) throws ConnectException, IOException { |
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100 | |||
101 | if (supportedVersions.size() == 0) |
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102 | { |
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103 | return null; |
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104 | } |
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105 | |||
106 | try
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107 | { |
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108 | String highestVersionSupportedByServer = getSuitableWMSVersion(host,""); |
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109 | if (supportedVersions.contains(highestVersionSupportedByServer))
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110 | { |
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111 | //we support the highest version supported by the server
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112 | // this is the best case
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113 | return createVersionDriver(highestVersionSupportedByServer);
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114 | } |
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115 | |||
116 | |||
117 | else
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118 | { |
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119 | // in case we dont support the highest version from the server
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120 | // we start the negotiation process in which we have to get the higest version
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121 | // the WMS supports and we are able to read.
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122 | Iterator iVersion = supportedVersions.iterator();
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123 | String wmsVersion;
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124 | String gvSIGVersion;
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125 | |||
126 | while (iVersion.hasNext()) {
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127 | gvSIGVersion = (String)iVersion.next();
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128 | wmsVersion = getSuitableWMSVersion(host,gvSIGVersion); |
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129 | //TODO:
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130 | //compare with the version returned by the WMS!!!!!
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131 | // send GetCapabilities and read the version to compare.
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132 | int res = wmsVersion.compareTo(gvSIGVersion);
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133 | |||
134 | if (res == 0) { //Si es la misma que nuestra version |
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135 | return createVersionDriver(gvSIGVersion);
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136 | } else if (res > 0) { //Si es mayor que nuestra version |
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137 | throw new Exception("Server Version too high: " + wmsVersion); |
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138 | } else { //Si es menor que nuestra version |
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139 | //Obtenemos la primera version menor o igual que tengamos
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140 | String lowerVersion = WMSProtocolHandlerFactory.getDriverVersion(wmsVersion, iVersion);
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141 | |||
142 | if (lowerVersion == null) { //Si no hay ninguna |
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143 | throw new Exception("Lowest server version is " + wmsVersion); |
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144 | } else {
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145 | if (lowerVersion.equals(wmsVersion)) {
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146 | return createVersionDriver(lowerVersion);
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147 | } else { //Si hay una version menor que la que retorno el servidor |
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148 | //iV = lower;
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149 | } |
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150 | } |
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151 | } |
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152 | } |
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153 | }//case we had to start the negotiation process.
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154 | return null; // if it did not find any suitable version. |
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155 | } |
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156 | catch(ConnectException conEx) |
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157 | { |
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158 | throw conEx;
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159 | } |
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160 | catch(IOException ioEx) |
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161 | { |
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162 | throw ioEx;
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163 | } |
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164 | catch(Exception e) |
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165 | { |
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166 | e.printStackTrace(); |
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167 | return null; |
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168 | } |
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169 | } |
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170 | |||
171 | /**
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172 | * Sends a GetCapabilities to the WMS server to get the version
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173 | * if the version parameter is null, the WMS will return the highest version supported
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174 | * if not it will return the lower highest version than the one requested.
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175 | * @param host
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176 | * @param version
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177 | * @return suitable version supported by the server
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178 | */
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179 | private static String getSuitableWMSVersion(String host, String _version) throws ConnectException, IOException |
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180 | { |
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181 | String request = WMSProtocolHandler.buildCapabilitiesSuitableVersionRequest(host, _version);
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182 | String version = new String(); |
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183 | StringReader reader = null; |
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184 | //InputStreamReader reader;
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185 | //InputStream is = null;
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186 | DataInputStream dis = null; |
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187 | try
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188 | { |
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189 | URL url = new URL(request); |
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190 | byte[] buffer = new byte[1024];//new byte[1024*256]; |
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191 | // is = url.openStream();
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192 | // reader = new InputStreamReader(is);
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193 | //int numberOfBytes = is.read(buffer);
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194 | //String readed = new String(buffer);
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195 | dis = new DataInputStream(url.openStream()); |
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196 | dis.readFully(buffer); |
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197 | String string = new String(buffer); |
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198 | |||
199 | // patch for ArcIMS + WMS connector > 9.0 bug
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200 | int a = string.toLowerCase().indexOf("<?xml"); |
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201 | if (a !=-1) |
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202 | string = string.substring(a, string.length()); |
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203 | // end patch
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204 | |||
205 | |||
206 | reader = new StringReader(string); |
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207 | KXmlParser kxmlParser = null;
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208 | kxmlParser = new KXmlParser();
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209 | kxmlParser.setInput(reader); |
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210 | kxmlParser.nextTag(); |
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211 | if ( kxmlParser.getEventType() != KXmlParser.END_DOCUMENT )
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212 | { |
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213 | if ((kxmlParser.getName().compareTo(CapabilitiesTags.CAPABILITIES_ROOT1_1_0)==0) |
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214 | ||(kxmlParser.getName().compareTo(CapabilitiesTags.CAPABILITIES_ROOT1_1_1)==0)
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215 | ||(kxmlParser.getName().compareTo(CapabilitiesTags.CAPABILITIES_ROOT1_3_0)==0))
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216 | { |
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217 | version = kxmlParser.getAttributeValue("", CapabilitiesTags.VERSION);
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218 | } |
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219 | } |
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220 | // do not forget to close the Stream.
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221 | reader.close(); |
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222 | dis.close(); |
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223 | return version;
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224 | } |
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225 | catch(ConnectException conEx) |
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226 | { |
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227 | throw new ConnectException(conEx.getMessage()); |
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228 | } |
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229 | catch(IOException ioEx) |
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230 | { |
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231 | throw new IOException(ioEx.getMessage()); |
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232 | } |
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233 | catch(XmlPullParserException xmlEx)
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234 | { |
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235 | xmlEx.printStackTrace(); |
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236 | return ""; |
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237 | } |
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238 | finally{
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239 | if (reader != null) |
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240 | { |
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241 | try{
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242 | reader.close(); |
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243 | }catch(Exception ex){ |
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244 | ex.printStackTrace(); |
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245 | } |
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246 | } |
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247 | if (dis != null) |
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248 | { |
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249 | try {
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250 | dis.close(); |
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251 | } catch(Exception ex) { |
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252 | ex.printStackTrace(); |
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253 | } |
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254 | } |
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255 | } |
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256 | } |
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257 | |||
258 | /**
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259 | * It creates an instance of a WMSDriver class.
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260 | *
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261 | * @param String, with the version of the driver to be created
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262 | * @return WMSDriver.
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263 | */
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264 | private static WMSProtocolHandler createVersionDriver(String version) |
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265 | { |
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266 | try
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267 | { |
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268 | Class driver;
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269 | version = version.replace('.', '_'); |
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270 | driver = Class.forName("org.gvsig.remoteclient.wms.wms_"+version+".WMSProtocolHandler" + version); |
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271 | return (WMSProtocolHandler)driver.newInstance();
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272 | } |
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273 | catch (Exception e) |
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274 | { |
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275 | e.printStackTrace(); |
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276 | //throw new Exception("WMSDriverFactory. Unknown driver version " + e);
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277 | return null; |
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278 | } |
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279 | } |
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280 | |||
281 | } |