svn-gvsig-desktop / branches / v2_0_0_prep / libraries / libRemoteServices / src / org / gvsig / remoteclient / wms / WMSProtocolHandlerFactory.java @ 34026
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1 | 3323 | ldiaz | |
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2 | 29658 | jpiera | package org.gvsig.remoteclient.wms; |
3 | 3323 | ldiaz | |
4 | 3773 | ldiaz | import java.io.DataInputStream; |
5 | 3785 | ldiaz | import java.io.IOException; |
6 | 3755 | ldiaz | import java.io.StringReader; |
7 | 3785 | ldiaz | import java.net.ConnectException; |
8 | 3323 | ldiaz | import java.net.URL; |
9 | import java.util.ArrayList; |
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10 | 3687 | ldiaz | import java.util.Iterator; |
11 | 3323 | ldiaz | |
12 | 3755 | ldiaz | import org.kxml2.io.KXmlParser; |
13 | 3785 | ldiaz | import org.xmlpull.v1.XmlPullParserException; |
14 | 3755 | ldiaz | |
15 | 33738 | jpiera | import org.gvsig.remoteclient.utils.CapabilitiesTags; |
16 | |||
17 | 3323 | ldiaz | /**
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18 | * <p></p>
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19 | 11381 | jaume | *
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20 | 3323 | ldiaz | */
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21 | public class WMSProtocolHandlerFactory { |
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22 | /**
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23 | * <p></p>
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24 | 11381 | jaume | *
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25 | 3323 | ldiaz | */
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26 | 29658 | jpiera | public org.gvsig.remoteclient.wms.WMSProtocolHandler wMSProtocolHandler;
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27 | 3323 | ldiaz | |
28 | 3687 | ldiaz | private static ArrayList supportedVersions = new ArrayList(); |
29 | 3323 | ldiaz | |
30 | static {
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31 | /*
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32 | * Se meten en el array versions las distintas versiones
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33 | * del protocolo en orden descendente
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34 | */
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35 | 3687 | ldiaz | //versions.add(WMSProtocolHandler1_3_0.class);
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36 | //versions.add(WMSProtocolHandler1_1_1.class);
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37 | supportedVersions.add("1.3.0");
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38 | supportedVersions.add("1.1.1");
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39 | supportedVersions.add("1.1.0");
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40 | 3323 | ldiaz | } |
41 | |||
42 | /**
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43 | * M?todo que dada una respuesta de getCapabilities y un iterador sobre una
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44 | * coleccion de WMSClient's ordenada descendentemente devuelve el cliente
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45 | * cuya version es igual o inmediatamente inferior
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46 | *
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47 | * @param caps Capabilities con la respuesta del servidor
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48 | * @param clients Iterador de conjunto ordenado descendientemente
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49 | *
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50 | * @return cliente cuya version es igual o inmediatamente inferior
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51 | * @throws IllegalAccessException
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52 | * @throws InstantiationException
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53 | 11381 | jaume | *
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54 | 3323 | ldiaz | */
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55 | 3687 | ldiaz | private static String getDriverVersion(String version, Iterator clients) throws InstantiationException, IllegalAccessException { |
56 | while (clients.hasNext()) {
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57 | String clientVersion = (String)clients.next(); |
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58 | int ret = version.compareTo(clientVersion);
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59 | 3323 | ldiaz | |
60 | 3687 | ldiaz | if (ret >= 0) { |
61 | return clientVersion;
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62 | } |
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63 | } |
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64 | return null; |
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65 | } |
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66 | |||
67 | 3323 | ldiaz | /**
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68 | * Establece la versi?n con la que se comunicar? con el servidor y devuelve
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69 | * el objeto Capabilities obtenido con dicha versi?n
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70 | *
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71 | * @param host maquina con la que se negocia
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72 | *
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73 | * @return instancia de un cliente capaz de negociar con el host que se
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74 | * pasa como par?metro
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75 | */
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76 | 5239 | ldiaz | public static WMSProtocolHandler negotiate(String host) throws ConnectException, IOException { |
77 | 3687 | ldiaz | |
78 | 11381 | jaume | if (supportedVersions.size() == 0) |
79 | 3687 | ldiaz | { |
80 | return null; |
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81 | } |
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82 | |||
83 | try
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84 | 11381 | jaume | { |
85 | 3687 | ldiaz | String highestVersionSupportedByServer = getSuitableWMSVersion(host,""); |
86 | if (supportedVersions.contains(highestVersionSupportedByServer))
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87 | { |
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88 | //we support the highest version supported by the server
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89 | 11381 | jaume | // this is the best case
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90 | 5239 | ldiaz | return createVersionDriver(highestVersionSupportedByServer);
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91 | 3687 | ldiaz | } |
92 | 11381 | jaume | |
93 | |||
94 | else
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95 | 3687 | ldiaz | { |
96 | // in case we dont support the highest version from the server
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97 | // we start the negotiation process in which we have to get the higest version
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98 | // the WMS supports and we are able to read.
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99 | Iterator iVersion = supportedVersions.iterator();
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100 | String wmsVersion;
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101 | String gvSIGVersion;
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102 | 11381 | jaume | |
103 | while (iVersion.hasNext()) {
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104 | 3687 | ldiaz | gvSIGVersion = (String)iVersion.next();
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105 | wmsVersion = getSuitableWMSVersion(host,gvSIGVersion); |
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106 | //TODO:
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107 | //compare with the version returned by the WMS!!!!!
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108 | // send GetCapabilities and read the version to compare.
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109 | int res = wmsVersion.compareTo(gvSIGVersion);
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110 | 11381 | jaume | |
111 | if (res == 0) { //Si es la misma que nuestra version |
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112 | 5239 | ldiaz | return createVersionDriver(gvSIGVersion);
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113 | 3687 | ldiaz | } else if (res > 0) { //Si es mayor que nuestra version |
114 | throw new Exception("Server Version too high: " + wmsVersion); |
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115 | } else { //Si es menor que nuestra version |
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116 | //Obtenemos la primera version menor o igual que tengamos
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117 | String lowerVersion = WMSProtocolHandlerFactory.getDriverVersion(wmsVersion, iVersion);
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118 | 11381 | jaume | |
119 | 3687 | ldiaz | if (lowerVersion == null) { //Si no hay ninguna |
120 | throw new Exception("Lowest server version is " + wmsVersion); |
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121 | } else {
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122 | 11381 | jaume | if (lowerVersion.equals(wmsVersion)) {
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123 | 5239 | ldiaz | return createVersionDriver(lowerVersion);
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124 | 3687 | ldiaz | } else { //Si hay una version menor que la que retorno el servidor |
125 | //iV = lower;
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126 | } |
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127 | } |
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128 | } |
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129 | } |
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130 | }//case we had to start the negotiation process.
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131 | 11381 | jaume | return null; // if it did not find any suitable version. |
132 | 3785 | ldiaz | } |
133 | catch(ConnectException conEx) |
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134 | 3687 | ldiaz | { |
135 | 3785 | ldiaz | throw conEx;
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136 | } |
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137 | 3803 | ldiaz | catch(IOException ioEx) |
138 | { |
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139 | throw ioEx;
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140 | 11381 | jaume | } |
141 | 3785 | ldiaz | catch(Exception e) |
142 | { |
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143 | 3687 | ldiaz | e.printStackTrace(); |
144 | return null; |
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145 | } |
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146 | 3323 | ldiaz | } |
147 | 11381 | jaume | |
148 | 3323 | ldiaz | /**
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149 | 3687 | ldiaz | * Sends a GetCapabilities to the WMS server to get the version
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150 | * if the version parameter is null, the WMS will return the highest version supported
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151 | * if not it will return the lower highest version than the one requested.
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152 | * @param host
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153 | * @param version
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154 | 11381 | jaume | * @return suitable version supported by the server
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155 | 3687 | ldiaz | */
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156 | 11381 | jaume | private static String getSuitableWMSVersion(String host, String _version) throws ConnectException, IOException |
157 | { |
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158 | 3687 | ldiaz | String request = WMSProtocolHandler.buildCapabilitiesSuitableVersionRequest(host, _version);
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159 | 11381 | jaume | String version = new String(); |
160 | 3755 | ldiaz | StringReader reader = null; |
161 | 3773 | ldiaz | //InputStreamReader reader;
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162 | //InputStream is = null;
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163 | DataInputStream dis = null; |
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164 | 3687 | ldiaz | try
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165 | 11381 | jaume | { |
166 | 3687 | ldiaz | URL url = new URL(request); |
167 | 4222 | jaume | byte[] buffer = new byte[1024];//new byte[1024*256]; |
168 | 11381 | jaume | // is = url.openStream();
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169 | // reader = new InputStreamReader(is);
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170 | //int numberOfBytes = is.read(buffer);
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171 | 3773 | ldiaz | //String readed = new String(buffer);
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172 | 11381 | jaume | dis = new DataInputStream(url.openStream()); |
173 | 3773 | ldiaz | dis.readFully(buffer); |
174 | 11381 | jaume | String string = new String(buffer); |
175 | |||
176 | // patch for ArcIMS + WMS connector > 9.0 bug
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177 | int a = string.toLowerCase().indexOf("<?xml"); |
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178 | if (a !=-1) |
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179 | string = string.substring(a, string.length()); |
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180 | // end patch
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181 | |||
182 | |||
183 | reader = new StringReader(string); |
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184 | 3687 | ldiaz | KXmlParser kxmlParser = null;
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185 | kxmlParser = new KXmlParser();
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186 | 11381 | jaume | kxmlParser.setInput(reader); |
187 | 3687 | ldiaz | kxmlParser.nextTag(); |
188 | 11381 | jaume | if ( kxmlParser.getEventType() != KXmlParser.END_DOCUMENT )
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189 | { |
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190 | 3743 | ldiaz | if ((kxmlParser.getName().compareTo(CapabilitiesTags.CAPABILITIES_ROOT1_1_0)==0) |
191 | ||(kxmlParser.getName().compareTo(CapabilitiesTags.CAPABILITIES_ROOT1_1_1)==0)
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192 | 3687 | ldiaz | ||(kxmlParser.getName().compareTo(CapabilitiesTags.CAPABILITIES_ROOT1_3_0)==0))
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193 | { |
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194 | version = kxmlParser.getAttributeValue("", CapabilitiesTags.VERSION);
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195 | } |
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196 | } |
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197 | 11381 | jaume | // do not forget to close the Stream.
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198 | reader.close(); |
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199 | 3773 | ldiaz | dis.close(); |
200 | 11381 | jaume | return version;
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201 | 3785 | ldiaz | } |
202 | catch(ConnectException conEx) |
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203 | { |
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204 | 11381 | jaume | throw new ConnectException(conEx.getMessage()); |
205 | 3785 | ldiaz | } |
206 | catch(IOException ioEx) |
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207 | { |
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208 | 11381 | jaume | throw new IOException(ioEx.getMessage()); |
209 | 3785 | ldiaz | } |
210 | catch(XmlPullParserException xmlEx)
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211 | { |
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212 | xmlEx.printStackTrace(); |
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213 | return ""; |
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214 | } |
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215 | 11381 | jaume | finally{
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216 | 3743 | ldiaz | if (reader != null) |
217 | { |
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218 | try{
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219 | reader.close(); |
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220 | }catch(Exception ex){ |
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221 | 11381 | jaume | ex.printStackTrace(); |
222 | 3743 | ldiaz | } |
223 | } |
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224 | 3773 | ldiaz | if (dis != null) |
225 | 3743 | ldiaz | { |
226 | 4500 | jaume | try {
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227 | 3773 | ldiaz | dis.close(); |
228 | 4500 | jaume | } catch(Exception ex) { |
229 | 11381 | jaume | ex.printStackTrace(); |
230 | 3743 | ldiaz | } |
231 | } |
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232 | 11381 | jaume | } |
233 | 3687 | ldiaz | } |
234 | 11381 | jaume | |
235 | 3687 | ldiaz | /**
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236 | 3323 | ldiaz | * It creates an instance of a WMSDriver class.
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237 | *
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238 | * @param String, with the version of the driver to be created
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239 | * @return WMSDriver.
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240 | */
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241 | 11381 | jaume | private static WMSProtocolHandler createVersionDriver(String version) |
242 | { |
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243 | 3687 | ldiaz | try
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244 | { |
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245 | Class driver;
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246 | version = version.replace('.', '_'); |
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247 | 29658 | jpiera | driver = Class.forName("org.gvsig.remoteclient.wms.wms_"+version+".WMSProtocolHandler" + version); |
248 | 5239 | ldiaz | return (WMSProtocolHandler)driver.newInstance();
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249 | 3687 | ldiaz | } |
250 | catch (Exception e) |
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251 | { |
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252 | e.printStackTrace(); |
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253 | //throw new Exception("WMSDriverFactory. Unknown driver version " + e);
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254 | return null; |
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255 | } |
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256 | 11381 | jaume | } |
257 | |||
258 | 3323 | ldiaz | } |