svn-gvsig-desktop / trunk / libraries / libRemoteServices / src / org / gvsig / remoteClient / wms / WMSProtocolHandler.java @ 5536
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package org.gvsig.remoteClient.wms; |
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import java.io.ByteArrayInputStream; |
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import java.io.DataInputStream; |
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import java.io.File; |
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import java.io.FileInputStream; |
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import java.io.IOException; |
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import java.io.InputStream; |
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import java.io.StringReader; |
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import java.net.URL; |
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import java.net.URLConnection; |
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import java.nio.ByteBuffer; |
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import java.nio.channels.FileChannel; |
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import java.util.ArrayList; |
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import java.util.HashMap; |
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import java.util.TreeMap; |
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import java.util.Vector; |
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|
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import org.gvsig.remoteClient.exceptions.ServerErrorException; |
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import org.gvsig.remoteClient.exceptions.WMSException; |
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import org.gvsig.remoteClient.utils.CapabilitiesTags; |
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import org.gvsig.remoteClient.utils.ExceptionTags; |
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import org.gvsig.remoteClient.utils.Utilities; |
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import org.kxml2.io.KXmlParser; |
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import org.xmlpull.v1.XmlPullParserException; |
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|
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/**
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* <p> Abstract class that represents handlers to comunicate via WMS protocol.
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* </p>
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*
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*/
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public abstract class WMSProtocolHandler { |
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/**
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* Encoding used to parse different xml documents.
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*/
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protected String encoding = "UTF-8"; |
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/**
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* procotol handler name
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*/
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protected String name; |
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/**
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* protocol handler version
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*/
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protected String version; |
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/**
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* host of the WMS to connect
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*/
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protected String host; |
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/**
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* port number of the comunication channel of the WMS to connect
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*/
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protected String port; |
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/**
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* WMS metadata
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*/
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protected ServiceInformation serviceInfo;
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public TreeMap layers; |
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public WMSLayer rootLayer;
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// public Vector srs;
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/**
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* parses the data retrieved by the WMS in XML format.
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* It will be mostly the WMS Capabilities, but the implementation
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* will be placed in the handler implementing certain version of the protocol.
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*
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*/
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public abstract void parse(File f) ; |
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/**
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* returns the alfanumeric information of the layers at the specified point.
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* the diference between the other getfeatureInfo method is that this will
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* be implemented by each specific version because the XML from the server will be
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* parsed and presented by a well known structure.
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*/
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public String getName() { |
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return name;
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} |
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public String getVersion() { |
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return version;
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} |
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public ServiceInformation getServiceInformation() {
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return serviceInfo;
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} |
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public String getHost () |
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{ |
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return host;
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} |
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public void setHost(String _host) |
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{ |
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host = _host; |
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} |
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public String getPort() |
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{ |
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return port;
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} |
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public void setPort(String _port) |
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{ |
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port = _port; |
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} |
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/**
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* <p>Builds a GetCapabilities request that is sent to the WMS
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* the response will be parse to extract the data needed by the
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* WMS client</p>
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* @param override, if true the previous downloaded data will be overridden
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*/
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public void getCapabilities(WMSStatus status, boolean override, ICancellable cancel) |
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{ |
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URL request = null; |
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try
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{ |
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request = new URL(buildCapabilitiesRequest(status)); |
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} |
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catch(Exception e) |
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{ |
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e.printStackTrace(); |
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} |
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try
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{ |
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if (override)
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Utilities.removeURL(request);
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File f = Utilities.downloadFile(request,"wms_capabilities.xml", cancel); |
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if (f == null) |
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return;
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clear(); |
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parse(f); |
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} catch(Exception e) |
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{ |
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//TODO
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e.printStackTrace(); |
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} |
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} |
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private void clear() { |
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layers.clear(); |
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serviceInfo.clear(); |
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} |
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|
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/**
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* <p>It will send a GetFeatureInfo request to the WMS
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* Parsing the response and redirecting the info to the WMS client</p>
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*/
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public String getFeatureInfo(WMSStatus status, int x, int y, int featureCount) |
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{ |
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URL request = null; |
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StringBuffer output = new StringBuffer(); |
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String outputFormat = new String(); |
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String ServiceException = "ServiceExceptionReport"; |
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StringBuffer sb = new StringBuffer(); |
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sb.append("<?xml version=\"1.0\" encoding=\"ISO-8859-1\"?>");
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try
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{ |
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//TODO:
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//pass this buildXXXRequest to the WMSProtocolHandlerXXX: The request can depend on the WMS version.
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request = new URL(buildGetFeatureInfoRequest(status, x, y)); |
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//TODO:
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//see which output format is being requested.
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} |
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catch(Exception e) |
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{ |
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e.printStackTrace(); |
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return ""; |
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} |
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try
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{ |
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System.out.println(request.toString());
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byte[] buffer = new byte[1024*256]; |
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DataInputStream is = new DataInputStream(request.openStream()); |
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outputFormat = request.openConnection().getContentType(); |
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for (int i = is.read(buffer); i>0; i = is.read(buffer)) |
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{ |
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String str = new String(buffer,0,i); |
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output.append(str); |
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} |
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is.close(); |
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if ( (outputFormat == null) || (outputFormat.indexOf("xml") != -1) |
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||output.toString().toLowerCase().startsWith("<?xml")
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||(outputFormat.indexOf("gml") != -1)) |
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{ |
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int tag;
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KXmlParser kxmlParser = null;
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kxmlParser = new KXmlParser();
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kxmlParser.setInput(new StringReader(output.toString())); |
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tag = kxmlParser.nextTag(); |
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if (kxmlParser.getName().compareTo(ServiceException)==0) |
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{ |
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sb.append("<INFO>").append(parseException( output.toString().getBytes())).append("</INFO>"); |
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return sb.toString();
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} |
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else if (kxmlParser.getName().compareToIgnoreCase("ERROR")==0) |
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{ |
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return output.toString();
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} |
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else
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{ |
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return output.toString();
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} |
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// while(tag != KXmlParser.END_DOCUMENT)
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// {
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// switch(tag)
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// {
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// case KXmlParser.START_TAG:
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// if (kxmlParser.getName().compareTo(ServiceException)==0)
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// {
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// sb.append("<INFO>").append(parseException( output.toString().getBytes())).append("</INFO>");
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// return sb.toString();
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// }
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// else if (kxmlParser.getName().compareToIgnoreCase("ERROR")==0)
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// return output.toString();
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// else
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// sb.append("<" + kxmlParser.getName() + ">\n");
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// break;
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// case KXmlParser.END_TAG:
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// sb.append("</" + kxmlParser.getName() + ">\n");
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// break;
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// case KXmlParser.TEXT:
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// sb.append(kxmlParser.getText());
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// break;
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// }
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// tag = kxmlParser.next();
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// }
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//return sb.toString();
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} |
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else
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{ |
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sb.append("<INFO>").append("Info format not supported").append("</INFO>"); |
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return sb.toString();
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//Para que funcione con el GetFeatureInfo Viewer generico hay que devolver:
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// return output.toString();
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} |
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} |
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catch(XmlPullParserException parserEx)
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{ |
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if (output.toString().toLowerCase().indexOf("xml") != -1) |
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{ |
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return output.toString().trim();
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} |
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else
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{ |
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sb.append("<INFO>").append("Info format not supported").append("</INFO>"); |
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return sb.toString();
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} |
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} |
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catch(Exception e) |
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{ |
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e.printStackTrace(); |
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sb.append("<INFO>").append("Info format not supported").append("</INFO>"); |
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return sb.toString();
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} |
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} |
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/**
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* <p>Builds a GetMap request that is sent to the WMS
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* the response (image) will be redirect to the
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* WMS client</p>
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*/
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public byte[] _getMap(WMSStatus status) throws ServerErrorException, WMSException |
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{ |
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URL request = null; |
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try
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{ |
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//TODO:
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//pass this buildXXXRequest to the WMSProtocolHandlerXXX: The request can depend on the WMS version.
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request = new URL(buildMapRequest(status)); |
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URLConnection conn = request.openConnection();
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System.out.println(request.toString());
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String type = conn.getContentType();
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byte[] imageBytes = null; |
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byte[] buffer = new byte[1024*256]; |
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InputStream is = conn.getInputStream();
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int readed = 0; |
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for (int i = is.read(buffer); i>0; i = is.read(buffer)){ |
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// Creates a new buffer to contain the previous readed bytes and the next bunch of bytes
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byte[] buffered = new byte[readed+i]; |
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for (int j = 0; j < buffered.length; j++) { |
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if (j<readed){
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// puts the previously downloaded bytes into the image buffer
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buffered[j] = imageBytes[j]; |
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} |
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else {
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// appends the recently downloaded bytes to the image buffer.
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buffered[j] = buffer[j-readed]; |
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} |
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} |
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imageBytes = (byte[]) buffered.clone(); |
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readed += i; |
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} |
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if ((type !=null && !type.subSequence(0,5).equals("image")) |
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||(Utilities.isTextData(imageBytes)))
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{ |
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WMSException wmsEx = null;
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String exceptionMessage = parseException(imageBytes);
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if (exceptionMessage==null) |
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{ |
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String error = new String(imageBytes); |
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int pos = error.indexOf("<?xml"); |
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if (pos!= -1) |
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{ |
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String xml = error.substring(pos,error.length());
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exceptionMessage = parseException(xml.getBytes()); |
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if (exceptionMessage == null) |
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exceptionMessage = new String(imageBytes); |
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} |
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} |
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wmsEx = new WMSException(exceptionMessage);
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wmsEx.setWMSMessage(new String(imageBytes)); |
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throw wmsEx;
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} |
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return imageBytes;
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} |
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catch(IOException e) |
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{ |
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e.printStackTrace(); |
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throw new ServerErrorException(); |
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} |
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} |
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public File getMap(WMSStatus status, ICancellable cancel) throws ServerErrorException, WMSException |
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{ |
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URL request = null; |
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try
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{ |
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//TODO:
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//pass this buildXXXRequest to the WMSProtocolHandlerXXX: The request can depend on the WMS version.
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request = new URL(buildMapRequest(status)); |
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File f = Utilities.downloadFile(request, "wmsGetMap", cancel); |
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if (f== null) |
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return f;
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if (Utilities.isTextFile(f)) { |
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FileInputStream fis = new FileInputStream(f); |
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FileChannel fc = fis.getChannel();
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byte[] data = new byte[(int)fc.size()]; // fc.size returns the size of the file which backs the channel |
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ByteBuffer bb = ByteBuffer.wrap(data); |
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fc.read(bb); |
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WMSException wmsEx = null;
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String exceptionMessage = parseException(data);
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if (exceptionMessage==null) |
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{ |
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String error = new String(data); |
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int pos = error.indexOf("<?xml"); |
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if (pos!= -1) |
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{ |
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String xml = error.substring(pos,error.length());
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exceptionMessage = parseException(xml.getBytes()); |
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// if (exceptionMessage == null)
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// exceptionMessage = new String(data);
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} |
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if (exceptionMessage == null) |
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exceptionMessage = new String(data); |
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} |
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wmsEx = new WMSException(exceptionMessage);
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wmsEx.setWMSMessage(new String(data)); |
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// Since it is an error file, It must be deleted from the cache
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Utilities.removeURL(request);
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throw wmsEx;
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} |
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return f;
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} |
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catch(IOException e) |
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{ |
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e.printStackTrace(); |
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throw new ServerErrorException(); |
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} |
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} |
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/* (non-Javadoc)
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* @see org.gvsig.remoteClient.wms.WMSProtocolHandler#parseException(byte[])
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*/
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protected String parseException(byte[] data) { |
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ArrayList errors = new ArrayList(); |
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KXmlParser kxmlParser = new KXmlParser();
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try
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{ |
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kxmlParser.setInput(new ByteArrayInputStream(data), encoding); |
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kxmlParser.nextTag(); |
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int tag;
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if ( kxmlParser.getEventType() != KXmlParser.END_DOCUMENT )
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{ |
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kxmlParser.require(KXmlParser.START_TAG, null, ExceptionTags.EXCEPTION_ROOT);
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tag = kxmlParser.nextTag(); |
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while(tag != KXmlParser.END_DOCUMENT)
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{ |
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switch(tag)
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{ |
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case KXmlParser.START_TAG:
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if (kxmlParser.getName().compareTo(ExceptionTags.SERVICE_EXCEPTION)==0){ |
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String errorCode = kxmlParser.getAttributeValue("", ExceptionTags.CODE); |
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errorCode = (errorCode != null) ? "["+errorCode+"] " : ""; |
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String errorMessage = kxmlParser.nextText();
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errors.add(errorCode+errorMessage); |
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} |
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break;
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case KXmlParser.END_TAG:
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break;
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|
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} |
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tag = kxmlParser.nextTag(); |
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} |
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//kxmlParser.require(KXmlParser.END_DOCUMENT, null, null);
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} |
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} |
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catch(XmlPullParserException parser_ex){
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parser_ex.printStackTrace(); |
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} |
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catch (IOException ioe) { |
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ioe.printStackTrace(); |
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} |
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String message = errors.size()>0? "" : null; |
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for (int i = 0; i < errors.size(); i++) { |
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message += (String) errors.get(i)+"\n"; |
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} |
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return message;
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} |
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/**
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* Builds the GetCapabilitiesRequest according to the OGC WMS Specifications
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* without a VERSION, to get the highest version than a WMS supports.
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*/
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public static String buildCapabilitiesSuitableVersionRequest(String _host, String _version) |
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{ |
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String req = new String(); |
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String symbol = getSymbol(_host);
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req = req + _host + symbol + "REQUEST=GetCapabilities&SERVICE=WMS&";
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if((_version != null) && (_version.length()>0 )) |
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{ |
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req += ("&VERSION=" + _version);
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} |
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req += ("&EXCEPTIONS=XML");
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return req;
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} |
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|
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/**
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* Builds the GetCapabilitiesRequest according to the OGC WMS Specifications
|
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* @param WMSStatus
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*/
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private String buildCapabilitiesRequest(WMSStatus status) |
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{ |
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StringBuffer req = new StringBuffer(); |
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String symbol = null; |
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|
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String onlineResource;
|
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if (status == null || status.getOnlineResource() == null) |
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onlineResource = getHost(); |
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else
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onlineResource = status.getOnlineResource(); |
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symbol = getSymbol(onlineResource); |
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|
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req.append(onlineResource).append(symbol).append("REQUEST=GetCapabilities&SERVICE=WMS&");
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req.append("VERSION=").append(getVersion()).append("&EXCEPTIONS=XML"); |
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return req.toString();
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} |
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|
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/**
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* Builds the GetFeatureInfoRequest according to the OGC WMS Specifications
|
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*/
|
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protected String buildGetFeatureInfoRequest(WMSStatus status, int x, int y) |
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{ |
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StringBuffer req = new StringBuffer(); |
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String symbol = null; |
480 |
|
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String onlineResource;
|
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if (status.getOnlineResource() == null) |
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onlineResource = getHost(); |
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else
|
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onlineResource = status.getOnlineResource(); |
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symbol = getSymbol(onlineResource); |
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|
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req.append(onlineResource).append(symbol).append("REQUEST=GetFeatureInfo&SERVICE=WMS&");
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req.append("QUERY_LAYERS=").append(Utilities.Vector2CS(status.getLayerNames())); |
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req.append("&VERSION=").append(getVersion()).append("&INFO_FORMAT=application/vnd.ogc.gml&"); |
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req.append(getPartialQuery(status)).append("&x="+x + "&y="+y); |
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if (status.getExceptionFormat() != null) { |
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req.append("&EXCEPTIONS=" + status.getExceptionFormat());
|
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} else {
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req.append("&EXCEPTIONS=XML");
|
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} |
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return req.toString().replaceAll(" ", "%20"); |
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} |
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|
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/**
|
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* Builds the GetMapRequest according to the OGC WMS Specifications
|
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*/
|
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private String buildMapRequest(WMSStatus status) |
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{ |
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StringBuffer req = new StringBuffer(); |
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String symbol = null; |
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String onlineResource = null; |
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|
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if (status.getOnlineResource() == null) |
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onlineResource = getHost(); |
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else
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onlineResource = status.getOnlineResource(); |
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symbol = getSymbol(onlineResource); |
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|
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req.append(onlineResource + symbol + "REQUEST=GetMap&SERVICE=WMS&VERSION=").append(getVersion()).append("&"); |
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req.append(getPartialQuery(status)); |
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// if (status.getExceptionFormat() != null) {
|
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// req.append("&EXCEPTIONS=" + status.getExceptionFormat());
|
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// } else {
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// req.append("&EXCEPTIONS=XML");
|
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// }
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return req.toString().replaceAll(" ", "%20"); |
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} |
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|
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/**
|
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* Just for not repeat code. Gets the correct separator according to the server URL
|
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* @param h
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* @return
|
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*/
|
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private static String getSymbol(String h) { |
531 |
String symbol;
|
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if (h.indexOf("?")==-1) |
533 |
symbol = "?";
|
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else if (h.indexOf("?")!=h.length()-1) |
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symbol = "&";
|
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else
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symbol = "";
|
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return symbol;
|
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} |
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|
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/**
|
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* Gets the part of the OGC request that share GetMap and GetFeatureInfo
|
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* @return String request
|
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*/
|
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public String getPartialQuery(WMSStatus status) |
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{ |
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StringBuffer req = new StringBuffer(); |
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req.append("LAYERS=" + Utilities.Vector2CS(status.getLayerNames())) |
549 |
.append("&SRS=" + status.getSrs())
|
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.append("&BBOX=" + status.getExtent().getMinX()+ "," ) |
551 |
.append(status.getExtent().getMinY()+ ",")
|
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.append(status.getExtent().getMaxX()+ ",")
|
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.append(status.getExtent().getMaxY()) |
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.append("&WIDTH=" + status.getWidth())
|
555 |
.append("&HEIGHT=" + status.getHeight())
|
556 |
.append("&FORMAT=" + status.getFormat())
|
557 |
.append("&STYLES=");
|
558 |
Vector v = status.getStyles();
|
559 |
if (v!=null && v.size()>0) |
560 |
req.append(Utilities.Vector2CS(v));
|
561 |
v = status.getDimensions(); |
562 |
if (v!=null && v.size()>0) |
563 |
req.append("&" + Utilities.Vector2URLParamString(v)); |
564 |
if (status.getTransparency()) {
|
565 |
req.append("&TRANSPARENT=TRUE");
|
566 |
} |
567 |
return req.toString();
|
568 |
} |
569 |
|
570 |
|
571 |
|
572 |
public void close() { |
573 |
// your code here
|
574 |
} |
575 |
|
576 |
/**
|
577 |
* Inner class that represents the description of the WMS metadata.
|
578 |
* The first part of the capabilities will return the service information
|
579 |
* from the WMS, this class will hold this information.
|
580 |
*
|
581 |
*/
|
582 |
public class ServiceInformation { |
583 |
|
584 |
public String online_resource = null; |
585 |
/*public String map_online_resource = null;
|
586 |
public String feature_online_resource = null;*/
|
587 |
public String version; |
588 |
public String name; |
589 |
public String scope; |
590 |
public String title; |
591 |
public String abstr; |
592 |
public String keywords; |
593 |
public String fees; |
594 |
public String operationsInfo; |
595 |
public String personname; |
596 |
public String organization; |
597 |
public String function; |
598 |
public String addresstype; |
599 |
public String address; |
600 |
public String place; |
601 |
public String province; |
602 |
public String postcode; |
603 |
public String country; |
604 |
public String phone; |
605 |
public String fax; |
606 |
public String email; |
607 |
public Vector formats; |
608 |
public HashMap operations; // operations that WMS supports |
609 |
|
610 |
public ServiceInformation()
|
611 |
{ |
612 |
version = new String(); |
613 |
name = new String(); |
614 |
scope = new String(); |
615 |
title = new String(); |
616 |
abstr = new String(); |
617 |
keywords = new String(); |
618 |
fees = new String(); |
619 |
operationsInfo = new String(); |
620 |
personname = new String(); |
621 |
organization = new String(); |
622 |
function = new String(); |
623 |
addresstype = new String(); |
624 |
address = new String(); |
625 |
place = new String(); |
626 |
province = new String(); |
627 |
postcode = new String(); |
628 |
country = new String(); |
629 |
phone = new String(); |
630 |
fax = new String(); |
631 |
email = new String(); |
632 |
formats = new Vector(); |
633 |
operations = new HashMap(); |
634 |
} |
635 |
public boolean isQueryable() |
636 |
{ |
637 |
if (operations.keySet().contains( CapabilitiesTags.GETFEATUREINFO ))
|
638 |
return true; |
639 |
else
|
640 |
return false; |
641 |
} |
642 |
|
643 |
public void clear() { |
644 |
version = new String(); |
645 |
name = new String(); |
646 |
scope = new String(); |
647 |
title = new String(); |
648 |
abstr = new String(); |
649 |
keywords = new String(); |
650 |
fees = new String(); |
651 |
operationsInfo = new String(); |
652 |
personname = new String(); |
653 |
organization = new String(); |
654 |
function = new String(); |
655 |
addresstype = new String(); |
656 |
address = new String(); |
657 |
place = new String(); |
658 |
province = new String(); |
659 |
postcode = new String(); |
660 |
country = new String(); |
661 |
phone = new String(); |
662 |
fax = new String(); |
663 |
email = new String(); |
664 |
formats = new Vector(); |
665 |
operations = new HashMap(); |
666 |
} |
667 |
} |
668 |
} |