root / branches / v2_0_0_prep / libraries / libRemoteServices / src / org / gvsig / remoteclient / wms / WMSProtocolHandler.java @ 34026
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package org.gvsig.remoteclient.wms; |
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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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import org.kxml2.io.KXmlParser; |
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import org.xmlpull.v1.XmlPullParserException; |
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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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/**
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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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* (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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* <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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try
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{
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if (status == null){ |
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} |
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WMSGetCapabilitiesRequest request = createGetCapabilitiesRequest(status); |
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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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clear(); |
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parseCapabilities(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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* <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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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 File getMap(WMSStatus status, ICancellable cancel) throws ServerErrorException, WMSException |
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{
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try
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{
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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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{
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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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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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/* (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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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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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()); |
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StringTokenizer tokens = new StringTokenizer(query, "&"); |
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String newQuery = "", token; |
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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(); |
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|
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if (token.toUpperCase().compareTo("REQUEST=GETCAPABILITIES") == 0) |
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continue;
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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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} |
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|
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if (token.toUpperCase().compareTo("EXCEPTIONS=XML") == 0) |
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continue;
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newQuery += token + "&";
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} |
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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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} |
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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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return _host;
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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());
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return req.toString();
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} |
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|
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public void close() { |
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// your code here
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} |
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|
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/**
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* @param status
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* The WMS status
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* @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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*/
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protected abstract WMSGetMapRequest createGetMapRequest(WMSStatus status); |
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|
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protected abstract WMSGetFeatureInfoRequest createGetFeatureInfoRequest(WMSStatus status, int x, int y); |
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|
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protected abstract WMSGetLegendGraphicRequest createGetLegendGraphicRequest(WMSStatus status, String layerName); |
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|
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protected abstract WMSGetCapabilitiesRequest createGetCapabilitiesRequest(WMSStatus status); |
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|
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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; |
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parser.require(KXmlParser.START_TAG, null, CapabilitiesTags.REQUEST);
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currentTag = parser.next(); |
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|
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while (!end)
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{
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switch(currentTag)
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{
|
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case KXmlParser.START_TAG:
|
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if (parser.getName().compareTo(CapabilitiesTags.GETCAPABILITIES)==0) |
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{
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parserDcpType(parser, CapabilitiesTags.GETCAPABILITIES); |
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} |
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else if (parser.getName().compareTo(CapabilitiesTags.GETMAP)==0) |
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{
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parseGetMapTag(parser); |
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} |
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else if (parser.getName().compareTo(CapabilitiesTags.GETFEATUREINFO)==0) |
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{
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parseGetFeatureInfoTag(parser); |
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} |
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else if (parser.getName().compareTo(CapabilitiesTags.DESCRIBELAYER)==0) |
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{
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parserDcpType(parser, CapabilitiesTags.DESCRIBELAYER); |
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} |
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else if (parser.getName().compareTo(CapabilitiesTags.GETLEGENDGRAPHIC)==0) |
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{
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parseGetLegendGraphicTag(parser); |
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} |
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break;
|
| 514 |
case KXmlParser.END_TAG:
|
| 515 |
if (parser.getName().compareTo(CapabilitiesTags.REQUEST) == 0) |
| 516 |
end = true;
|
| 517 |
break;
|
| 518 |
case KXmlParser.TEXT:
|
| 519 |
break;
|
| 520 |
} |
| 521 |
if(!end)
|
| 522 |
currentTag = parser.next(); |
| 523 |
} |
| 524 |
// TODO: does not get such a tag when arrives here!!!!!!
|
| 525 |
//parser.require(KXmlParser.END_TAG, null, CapabilitiesTags.REQUEST);
|
| 526 |
} |
| 527 |
/**
|
| 528 |
* <p>Parses the GetMap tag </p>
|
| 529 |
*/
|
| 530 |
protected void parseGetMapTag(KXmlParser parser) throws IOException, XmlPullParserException |
| 531 |
{
|
| 532 |
int currentTag;
|
| 533 |
boolean end = false; |
| 534 |
|
| 535 |
parser.require(KXmlParser.START_TAG, null, CapabilitiesTags.GETMAP);
|
| 536 |
currentTag = parser.next(); |
| 537 |
|
| 538 |
while (!end)
|
| 539 |
{
|
| 540 |
switch(currentTag)
|
| 541 |
{
|
| 542 |
case KXmlParser.START_TAG:
|
| 543 |
if (parser.getName().compareTo(CapabilitiesTags.FORMAT)==0) |
| 544 |
{
|
| 545 |
serviceInfo.formats.add(parser.nextText()); |
| 546 |
} |
| 547 |
else if (parser.getName().compareTo(CapabilitiesTags.DCPTYPE)==0) |
| 548 |
{
|
| 549 |
parserDcpType(parser, CapabilitiesTags.GETMAP); |
| 550 |
} |
| 551 |
break;
|
| 552 |
case KXmlParser.END_TAG:
|
| 553 |
if (parser.getName().compareTo(CapabilitiesTags.GETMAP) == 0) |
| 554 |
end = true;
|
| 555 |
break;
|
| 556 |
case KXmlParser.TEXT:
|
| 557 |
break;
|
| 558 |
} |
| 559 |
if(!end)
|
| 560 |
currentTag = parser.next(); |
| 561 |
} |
| 562 |
} |
| 563 |
|
| 564 |
/**
|
| 565 |
* <p>Parses the GetFeatureInfo tag </p>
|
| 566 |
*/
|
| 567 |
protected void parseGetFeatureInfoTag(KXmlParser parser) throws IOException, XmlPullParserException |
| 568 |
{
|
| 569 |
int currentTag;
|
| 570 |
boolean end = false; |
| 571 |
|
| 572 |
parser.require(KXmlParser.START_TAG, null, CapabilitiesTags.GETFEATUREINFO);
|
| 573 |
currentTag = parser.next(); |
| 574 |
|
| 575 |
while (!end)
|
| 576 |
{
|
| 577 |
switch(currentTag)
|
| 578 |
{
|
| 579 |
case KXmlParser.START_TAG:
|
| 580 |
if (parser.getName().compareTo(CapabilitiesTags.FORMAT)==0) |
| 581 |
{
|
| 582 |
//TODO:
|
| 583 |
// add the supported formats by the GetFeatureInfo request
|
| 584 |
//serviceInfo.formats.add(parser.nextText());
|
| 585 |
} |
| 586 |
else if (parser.getName().compareTo(CapabilitiesTags.DCPTYPE)==0) |
| 587 |
{
|
| 588 |
parserDcpType(parser, CapabilitiesTags.GETFEATUREINFO); |
| 589 |
} |
| 590 |
break;
|
| 591 |
case KXmlParser.END_TAG:
|
| 592 |
if (parser.getName().compareTo(CapabilitiesTags.GETFEATUREINFO) == 0) |
| 593 |
end = true;
|
| 594 |
break;
|
| 595 |
case KXmlParser.TEXT:
|
| 596 |
break;
|
| 597 |
} |
| 598 |
if(!end)
|
| 599 |
currentTag = parser.next(); |
| 600 |
} |
| 601 |
} |
| 602 |
|
| 603 |
/**
|
| 604 |
* <p>Parses the GetLegendGraphic tag </p>
|
| 605 |
*/
|
| 606 |
protected void parseGetLegendGraphicTag(KXmlParser parser) throws IOException, XmlPullParserException |
| 607 |
{
|
| 608 |
int currentTag;
|
| 609 |
boolean end = false; |
| 610 |
|
| 611 |
parser.require(KXmlParser.START_TAG, null, CapabilitiesTags.GETLEGENDGRAPHIC);
|
| 612 |
currentTag = parser.next(); |
| 613 |
|
| 614 |
while (!end)
|
| 615 |
{
|
| 616 |
switch(currentTag)
|
| 617 |
{
|
| 618 |
case KXmlParser.START_TAG:
|
| 619 |
if (parser.getName().compareTo(CapabilitiesTags.FORMAT)==0) |
| 620 |
{
|
| 621 |
//TODO:
|
| 622 |
// add the supported formats by the GetLegendGraphic request
|
| 623 |
//serviceInfo.formats.add(parser.nextText());
|
| 624 |
} |
| 625 |
else if (parser.getName().compareTo(CapabilitiesTags.DCPTYPE)==0) |
| 626 |
{
|
| 627 |
parserDcpType(parser, CapabilitiesTags.GETLEGENDGRAPHIC); |
| 628 |
} |
| 629 |
break;
|
| 630 |
case KXmlParser.END_TAG:
|
| 631 |
if (parser.getName().compareTo(CapabilitiesTags.GETLEGENDGRAPHIC) == 0) |
| 632 |
end = true;
|
| 633 |
break;
|
| 634 |
case KXmlParser.TEXT:
|
| 635 |
break;
|
| 636 |
} |
| 637 |
if(!end)
|
| 638 |
currentTag = parser.next(); |
| 639 |
} |
| 640 |
} |
| 641 |
} |