root / branches / v2_0_0_prep / libraries / libRemoteServices / src / org / gvsig / remoteclient / wms / WMSProtocolHandler.java @ 38579
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package org.gvsig.remoteclient.wms; |
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|
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import java.io.ByteArrayInputStream; |
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import java.io.File; |
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import java.io.FileReader; |
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import java.io.IOException; |
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import java.io.InputStream; |
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import java.net.URL; |
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import java.net.URLConnection; |
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import java.util.ArrayList; |
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import java.util.StringTokenizer; |
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import java.util.TreeMap; |
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|
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import org.gvsig.compat.net.ICancellable; |
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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.ogc.OGCProtocolHandler; |
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import org.gvsig.remoteclient.ogc.OGCServiceInformation; |
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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.gvsig.remoteclient.wms.request.WMSGetCapabilitiesRequest; |
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import org.gvsig.remoteclient.wms.request.WMSGetFeatureInfoRequest; |
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import org.gvsig.remoteclient.wms.request.WMSGetLegendGraphicRequest; |
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import org.gvsig.remoteclient.wms.request.WMSGetMapRequest; |
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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 extends OGCProtocolHandler { |
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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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* WMS metadata
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*/
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protected WMSServiceInformation serviceInfo;
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public TreeMap layers; |
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public WMSLayer rootLayer;
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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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|
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/*
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* (non-Javadoc)
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* @see org.gvsig.remoteClient.ogc.OGCProtocolHandler#getServiceInformation()
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*/
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public OGCServiceInformation getServiceInformation() {
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return serviceInfo;
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} |
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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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URL request = null; |
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try {
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request = new URL(buildCapabilitiesRequest(status)); |
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} catch(Exception e) { |
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e.printStackTrace(); |
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} |
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try {
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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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//WMSGetCapabilitiesRequest request = createGetCapabilitiesRequest(status);
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//File f = request.sendRequest();
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if (f == null) |
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return;
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clear(); |
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parseCapabilities(f); |
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} catch(Exception e) { |
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e.printStackTrace(); |
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} |
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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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* TODO: return a stored file instead a String.
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*/
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public String getFeatureInfo(WMSStatus status, int x, int y, int featureCount, ICancellable cancel) |
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{ |
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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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WMSGetFeatureInfoRequest request = createGetFeatureInfoRequest(status, x, y); |
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URL url = request.getURL();
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outputFormat = url.openConnection().getContentType(); |
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File f = request.sendRequest(cancel);
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if (f == null){ |
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return ""; |
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} |
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|
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FileReader fReader = new FileReader(f); |
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char[] buffer = new char[1024*256]; |
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for (int i = fReader.read(buffer); i>0; i = fReader.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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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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kxmlParser.setInput(new FileReader(f)); |
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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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} |
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else
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{ |
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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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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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WMSGetMapRequest request = createGetMapRequest(status); |
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URL url = request.getURL();
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URLConnection conn = url.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 getLegendGraphic(WMSStatus status, String layerName, ICancellable cancel) throws ServerErrorException, WMSException |
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{ |
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try
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{ |
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WMSGetLegendGraphicRequest request = createGetLegendGraphicRequest(status, layerName); |
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File f = request.sendRequest(cancel);
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if (f== null) |
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return null; |
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if (Utilities.isTextFile(f)) { |
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byte[] data = fileToBytes(f); |
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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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} |
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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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downloader.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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public URL getMapURL(WMSStatus status, ICancellable cancel) throws ServerErrorException, WMSException { |
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try {
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WMSGetMapRequest request = createGetMapRequest(status); |
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return request.getURL();
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} catch(IOException e) { |
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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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/**
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* Returns the exception message if the file is a XML instead of a image.
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* @param file3
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* @return
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* @throws IOException
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*/
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public String getExceptionMessage(File f) throws IOException { |
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if (f == null) |
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return null; |
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if (Utilities.isTextFile(f)) { |
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byte[] data = fileToBytes(f); |
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String exceptionMessage = parseException(data);
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if (exceptionMessage == null) { |
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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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String xml = error.substring(pos,error.length());
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exceptionMessage = parseException(xml.getBytes()); |
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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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return exceptionMessage;
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} |
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return null; |
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} |
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public File getMap(WMSStatus status, ICancellable cancel) throws ServerErrorException, WMSException { |
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try {
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WMSGetMapRequest request = createGetMapRequest(status); |
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File f = request.sendRequest(cancel);
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if (f== null) |
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return null; |
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if (Utilities.isTextFile(f)) { |
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byte[] data = fileToBytes(f); |
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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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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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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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downloader.removeURL(request); |
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throw wmsEx;
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} |
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return f;
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} catch(IOException e) { |
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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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int index = _host.indexOf('?'); |
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|
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if (index > -1) { |
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String host = _host.substring(0, index + 1); |
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String query = _host.substring(index + 1, _host.length()); |
431 |
|
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StringTokenizer tokens = new StringTokenizer(query, "&"); |
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String newQuery = "", token; |
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|
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// If there is a field or a value with spaces, (and then it's on different tokens) -> unify them
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while (tokens.hasMoreTokens()) {
|
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token = tokens.nextToken().trim(); |
438 |
|
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if (token.toUpperCase().compareTo("REQUEST=GETCAPABILITIES") == 0) |
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continue;
|
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|
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if (token.toUpperCase().compareTo("SERVICE=WMS") == 0) |
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continue;
|
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|
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if ((_version != null) && (_version.length() > 0)) { |
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if (token.toUpperCase().compareTo("VERSION=" + _version) == 0) |
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continue;
|
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} |
449 |
|
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if (token.toUpperCase().compareTo("EXCEPTIONS=XML") == 0) |
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continue;
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|
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newQuery += token + "&";
|
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} |
455 |
|
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_host = host + newQuery; |
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} |
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else {
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_host += "?";
|
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} |
461 |
|
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if ((_version != null) && (_version.compareTo("") != 0)) |
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_host += "REQUEST=GetCapabilities&SERVICE=WMS&VERSION=" + _version;
|
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else
|
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_host += "REQUEST=GetCapabilities&SERVICE=WMS";
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|
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return _host;
|
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} |
469 |
|
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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) |
475 |
{ |
476 |
StringBuffer req = new StringBuffer(); |
477 |
String symbol = null; |
478 |
|
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String onlineResource;
|
480 |
if (status == null || status.getOnlineResource() == null) |
481 |
onlineResource = getHost(); |
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else
|
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onlineResource = status.getOnlineResource(); |
484 |
symbol = getSymbol(onlineResource); |
485 |
|
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req.append(onlineResource).append(symbol).append("REQUEST=GetCapabilities&SERVICE=WMS&");
|
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req.append("VERSION=").append(getVersion());
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return req.toString();
|
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} |
490 |
|
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public void close() { |
492 |
// your code here
|
493 |
} |
494 |
|
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/**
|
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* @param status
|
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* The WMS status
|
498 |
* @param protocolHandler
|
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* The handler to parse the requests
|
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* @return an object to send the GetMap requests
|
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*/
|
502 |
protected abstract WMSGetMapRequest createGetMapRequest(WMSStatus status); |
503 |
|
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protected abstract WMSGetFeatureInfoRequest createGetFeatureInfoRequest(WMSStatus status, int x, int y); |
505 |
|
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protected abstract WMSGetLegendGraphicRequest createGetLegendGraphicRequest(WMSStatus status, String layerName); |
507 |
|
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protected abstract WMSGetCapabilitiesRequest createGetCapabilitiesRequest(WMSStatus status); |
509 |
|
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/**
|
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* <p>Parses the Request tag </p>
|
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*/
|
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protected void parseRequestTag(KXmlParser parser) throws IOException, XmlPullParserException |
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{ |
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int currentTag;
|
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boolean end = false; |
517 |
|
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parser.require(KXmlParser.START_TAG, null, CapabilitiesTags.REQUEST);
|
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currentTag = parser.next(); |
520 |
|
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while (!end)
|
522 |
{ |
523 |
switch(currentTag)
|
524 |
{ |
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case KXmlParser.START_TAG:
|
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if (parser.getName().compareTo(CapabilitiesTags.GETCAPABILITIES)==0) |
527 |
{ |
528 |
parserDcpType(parser, CapabilitiesTags.GETCAPABILITIES); |
529 |
} |
530 |
else if (parser.getName().compareTo(CapabilitiesTags.GETMAP)==0) |
531 |
{ |
532 |
parseGetMapTag(parser); |
533 |
} |
534 |
else if (parser.getName().compareTo(CapabilitiesTags.GETFEATUREINFO)==0) |
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{ |
536 |
parseGetFeatureInfoTag(parser); |
537 |
} |
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else if (parser.getName().compareTo(CapabilitiesTags.DESCRIBELAYER)==0) |
539 |
{ |
540 |
parserDcpType(parser, CapabilitiesTags.DESCRIBELAYER); |
541 |
} |
542 |
else if (parser.getName().compareTo(CapabilitiesTags.GETLEGENDGRAPHIC)==0) |
543 |
{ |
544 |
parseGetLegendGraphicTag(parser); |
545 |
} |
546 |
break;
|
547 |
case KXmlParser.END_TAG:
|
548 |
if (parser.getName().compareTo(CapabilitiesTags.REQUEST) == 0) |
549 |
end = true;
|
550 |
break;
|
551 |
case KXmlParser.TEXT:
|
552 |
break;
|
553 |
} |
554 |
if(!end)
|
555 |
currentTag = parser.next(); |
556 |
} |
557 |
// TODO: does not get such a tag when arrives here!!!!!!
|
558 |
//parser.require(KXmlParser.END_TAG, null, CapabilitiesTags.REQUEST);
|
559 |
} |
560 |
/**
|
561 |
* <p>Parses the GetMap tag </p>
|
562 |
*/
|
563 |
protected void parseGetMapTag(KXmlParser parser) throws IOException, XmlPullParserException |
564 |
{ |
565 |
int currentTag;
|
566 |
boolean end = false; |
567 |
|
568 |
parser.require(KXmlParser.START_TAG, null, CapabilitiesTags.GETMAP);
|
569 |
currentTag = parser.next(); |
570 |
|
571 |
while (!end)
|
572 |
{ |
573 |
switch(currentTag)
|
574 |
{ |
575 |
case KXmlParser.START_TAG:
|
576 |
if (parser.getName().compareTo(CapabilitiesTags.FORMAT)==0) |
577 |
{ |
578 |
serviceInfo.formats.add(parser.nextText()); |
579 |
} |
580 |
else if (parser.getName().compareTo(CapabilitiesTags.DCPTYPE)==0) |
581 |
{ |
582 |
parserDcpType(parser, CapabilitiesTags.GETMAP); |
583 |
} |
584 |
break;
|
585 |
case KXmlParser.END_TAG:
|
586 |
if (parser.getName().compareTo(CapabilitiesTags.GETMAP) == 0) |
587 |
end = true;
|
588 |
break;
|
589 |
case KXmlParser.TEXT:
|
590 |
break;
|
591 |
} |
592 |
if(!end)
|
593 |
currentTag = parser.next(); |
594 |
} |
595 |
} |
596 |
|
597 |
/**
|
598 |
* <p>Parses the GetFeatureInfo tag </p>
|
599 |
*/
|
600 |
protected void parseGetFeatureInfoTag(KXmlParser parser) throws IOException, XmlPullParserException |
601 |
{ |
602 |
int currentTag;
|
603 |
boolean end = false; |
604 |
|
605 |
parser.require(KXmlParser.START_TAG, null, CapabilitiesTags.GETFEATUREINFO);
|
606 |
currentTag = parser.next(); |
607 |
|
608 |
while (!end)
|
609 |
{ |
610 |
switch(currentTag)
|
611 |
{ |
612 |
case KXmlParser.START_TAG:
|
613 |
if (parser.getName().compareTo(CapabilitiesTags.FORMAT)==0) |
614 |
{ |
615 |
serviceInfo.infoformats.add(parser.nextText()); |
616 |
} |
617 |
else if (parser.getName().compareTo(CapabilitiesTags.DCPTYPE)==0) |
618 |
{ |
619 |
parserDcpType(parser, CapabilitiesTags.GETFEATUREINFO); |
620 |
} |
621 |
break;
|
622 |
case KXmlParser.END_TAG:
|
623 |
if (parser.getName().compareTo(CapabilitiesTags.GETFEATUREINFO) == 0) |
624 |
end = true;
|
625 |
break;
|
626 |
case KXmlParser.TEXT:
|
627 |
break;
|
628 |
} |
629 |
if(!end)
|
630 |
currentTag = parser.next(); |
631 |
} |
632 |
} |
633 |
|
634 |
/**
|
635 |
* <p>Parses the GetLegendGraphic tag </p>
|
636 |
*/
|
637 |
protected void parseGetLegendGraphicTag(KXmlParser parser) throws IOException, XmlPullParserException |
638 |
{ |
639 |
int currentTag;
|
640 |
boolean end = false; |
641 |
|
642 |
parser.require(KXmlParser.START_TAG, null, CapabilitiesTags.GETLEGENDGRAPHIC);
|
643 |
currentTag = parser.next(); |
644 |
|
645 |
while (!end)
|
646 |
{ |
647 |
switch(currentTag)
|
648 |
{ |
649 |
case KXmlParser.START_TAG:
|
650 |
if (parser.getName().compareTo(CapabilitiesTags.FORMAT)==0) |
651 |
{ |
652 |
//TODO:
|
653 |
// add the supported formats by the GetLegendGraphic request
|
654 |
//serviceInfo.formats.add(parser.nextText());
|
655 |
} |
656 |
else if (parser.getName().compareTo(CapabilitiesTags.DCPTYPE)==0) |
657 |
{ |
658 |
parserDcpType(parser, CapabilitiesTags.GETLEGENDGRAPHIC); |
659 |
} |
660 |
break;
|
661 |
case KXmlParser.END_TAG:
|
662 |
if (parser.getName().compareTo(CapabilitiesTags.GETLEGENDGRAPHIC) == 0) |
663 |
end = true;
|
664 |
break;
|
665 |
case KXmlParser.TEXT:
|
666 |
break;
|
667 |
} |
668 |
if(!end)
|
669 |
currentTag = parser.next(); |
670 |
} |
671 |
} |
672 |
} |