svn-gvsig-desktop / branches / MULTITHREADING_DEVELOPMENT / libraries / libRemoteServices / src / org / gvsig / remoteClient / wms / WMSProtocolHandler.java @ 5378
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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.StringReader; |
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import java.net.MalformedURLException; |
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import java.net.URL; |
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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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import org.gvsig.remoteClient.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.taskplanning.retrieving.RequestManager; |
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import org.gvsig.remoteClient.taskplanning.retrieving.RetrieveEvent; |
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import org.gvsig.remoteClient.taskplanning.retrieving.RetrieveListener; |
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import org.gvsig.remoteClient.taskplanning.retrieving.URLRequest; |
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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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import com.iver.andami.PluginServices; |
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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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private URLRequest capabilitiesRequest, mapRequest, featureInfo;
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/**
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* The listener that a driver must implement to receive the events.
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*/
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private WMSEventListener theListener;
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/**
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* Listener for the asynchronous getCapabilities requests
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*/
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private RetrieveListener getCapabilitiesListener = new RetrieveListener() { |
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public void transferEventReceived(RetrieveEvent event) { |
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int type = event.getType();
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if (type == RetrieveEvent.REQUEST_FINISHED) {
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System.out.println("parsing "+capabilitiesRequest.getFileName()); |
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parse(new File(capabilitiesRequest.getFileName())); |
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} |
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if (theListener!=null) { |
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theListener.newEvent(WMSEventListener.CAPABILITIES, event); |
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} |
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} |
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} , |
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/**
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* Listener for the asynchronous getMap requests
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*/
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getMapListener = new RetrieveListener() {
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public void transferEventReceived(RetrieveEvent event) { |
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int type = event.getType();
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if (type == RetrieveEvent.REQUEST_FINISHED) {
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// TODO revisar no estic segur de que a?? haja d'estar ac?
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System.out.println(event.getFileName());
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File f = new File(event.getFileName()); |
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if (Utilities.isTextFile(f)) { |
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FileInputStream fis;
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try {
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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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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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event.setType(RetrieveEvent.ERROR); |
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event.setMessage(exceptionMessage); |
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// Since it is an error file, It must be deleted from the cache
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RequestManager.getInstance().removeURLRequest(mapRequest); |
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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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if (theListener!=null) { |
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theListener.newEvent(WMSEventListener.MAP, event); |
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} |
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} |
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} |
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} , |
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getFeatureInfoListener = new RetrieveListener() {
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public void transferEventReceived(RetrieveEvent event) { |
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int type = event.getType();
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}}; |
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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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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 parsed 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) |
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{
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try
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{
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//request = new URL(buildCapabilitiesRequest(status));
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capabilitiesRequest = buildCapabilitiesRequest(status); |
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capabilitiesRequest.setFileName("wmsCapabilities");
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if (override)
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RequestManager.getInstance().removeURLRequest(capabilitiesRequest); |
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capabilitiesRequest = RequestManager.getInstance().addURLRequest(capabilitiesRequest, getCapabilitiesListener); |
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} catch(MalformedURLException e) { |
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e.printStackTrace(); |
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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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} |
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else
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{
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sb.append("<INFO>").append(PluginServices.getText(this, "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(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(PluginServices.getText(this, "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(PluginServices.getText(this, "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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public void getMap(WMSStatus status, ICancellable cancel) |
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{
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try
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{
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mapRequest = buildMapRequest(status, cancel); |
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mapRequest.setFileName("wmsGetMap");
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mapRequest = RequestManager.getInstance().addURLRequest(mapRequest, getMapListener); |
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} catch(MalformedURLException e) { |
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e.printStackTrace(); |
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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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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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* Builds the GetCapabilitiesRequest according to the OGC WMS Specifications
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* @param WMSStatus
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* @throws MalformedURLException
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*/
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private URLRequest buildCapabilitiesRequest(WMSStatus status) throws MalformedURLException |
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{
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URLRequest req = new URLRequest();
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StringBuffer u = new StringBuffer(); |
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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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u.append(onlineResource). |
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append(getSymbol(onlineResource)). |
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append("REQUEST=GetCapabilities&SERVICE=WMS&").
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append("VERSION=").append(getVersion()).append("&EXCEPTIONS=XML"); |
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URL url = new URL(u.toString()); |
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req.setHost(url.getHost()); |
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req.setRequestType(URLRequest.GET); |
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req.setProtocol(URLRequest.HTTP); |
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req.setFile(url.getFile()); |
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int myPort = url.getPort();
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if (myPort != -1 && myPort != 80 ) |
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req.setPort(myPort); |
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return req;
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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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private 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; |
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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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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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* Builds the GetMapRequest according to the OGC WMS Specifications
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* @throws MalformedURLException
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*/
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private URLRequest buildMapRequest(WMSStatus status, ICancellable cancel) throws MalformedURLException |
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{
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URLRequest req = new URLRequest();
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StringBuffer u = new StringBuffer(); |
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String onlineResource = null; |
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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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u.append(onlineResource + getSymbol(onlineResource) + "REQUEST=GetMap&SERVICE=WMS&VERSION=").append(getVersion()).append("&"); |
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u.append(getPartialQuery(status)); |
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if (status.getExceptionFormat() != null) { |
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u.append("&EXCEPTIONS=" + status.getExceptionFormat());
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} else {
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u.append("&EXCEPTIONS=XML");
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} |
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URL url = new URL(u.toString()); |
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req.setHost(url.getHost()); |
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req.setRequestType(URLRequest.GET); |
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req.setProtocol(URLRequest.HTTP); |
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req.setFile(url.getFile()); |
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int myPort = url.getPort();
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if (myPort != -1 && myPort != 80 ) |
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req.setPort(myPort); |
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req.setCancel(cancel); |
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return req;
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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) { |
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String symbol;
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if (h.indexOf("?")==-1) |
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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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* 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())) |
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.append("&SRS=" + status.getSrs())
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.append("&BBOX=" + status.getExtent().getMinX()+ "," ) |
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.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())
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.append("&HEIGHT=" + status.getHeight())
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.append("&FORMAT=" + status.getFormat())
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.append("&STYLES=");
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Vector v = status.getStyles();
|
| 509 |
if (v!=null && v.size()>0) |
| 510 |
req.append(Utilities.Vector2CS(v));
|
| 511 |
v = status.getDimensions(); |
| 512 |
if (v!=null && v.size()>0) |
| 513 |
req.append("&" + Utilities.Vector2URLParamString(v)); |
| 514 |
if (status.getTransparency()) {
|
| 515 |
req.append("&TRANSPARENT=TRUE");
|
| 516 |
} |
| 517 |
return req.toString();
|
| 518 |
} |
| 519 |
|
| 520 |
|
| 521 |
|
| 522 |
public void close() { |
| 523 |
// your code here
|
| 524 |
} |
| 525 |
|
| 526 |
/**
|
| 527 |
* Inner class that represents the description of the WMS metadata.
|
| 528 |
* The first part of the capabilities will return the service information
|
| 529 |
* from the WMS, this class will hold this information.
|
| 530 |
*
|
| 531 |
*/
|
| 532 |
public class ServiceInformation { |
| 533 |
|
| 534 |
public String online_resource = null; |
| 535 |
/*public String map_online_resource = null;
|
| 536 |
public String feature_online_resource = null;*/
|
| 537 |
public String version; |
| 538 |
public String name; |
| 539 |
public String scope; |
| 540 |
public String title; |
| 541 |
public String abstr; |
| 542 |
public String keywords; |
| 543 |
public String fees; |
| 544 |
public String operationsInfo; |
| 545 |
public String personname; |
| 546 |
public String organization; |
| 547 |
public String function; |
| 548 |
public String addresstype; |
| 549 |
public String address; |
| 550 |
public String place; |
| 551 |
public String province; |
| 552 |
public String postcode; |
| 553 |
public String country; |
| 554 |
public String phone; |
| 555 |
public String fax; |
| 556 |
public String email; |
| 557 |
public Vector formats; |
| 558 |
public HashMap operations; // operations that WMS supports |
| 559 |
|
| 560 |
public ServiceInformation()
|
| 561 |
{
|
| 562 |
version = new String(); |
| 563 |
name = new String(); |
| 564 |
scope = new String(); |
| 565 |
title = new String(); |
| 566 |
abstr = new String(); |
| 567 |
keywords = new String(); |
| 568 |
fees = new String(); |
| 569 |
operationsInfo = new String(); |
| 570 |
personname = new String(); |
| 571 |
organization = new String(); |
| 572 |
function = new String(); |
| 573 |
addresstype = new String(); |
| 574 |
address = new String(); |
| 575 |
place = new String(); |
| 576 |
province = new String(); |
| 577 |
postcode = new String(); |
| 578 |
country = new String(); |
| 579 |
phone = new String(); |
| 580 |
fax = new String(); |
| 581 |
email = new String(); |
| 582 |
formats = new Vector(); |
| 583 |
operations = new HashMap(); |
| 584 |
} |
| 585 |
public boolean isQueryable() |
| 586 |
{
|
| 587 |
if (operations.keySet().contains( CapabilitiesTags.GETFEATUREINFO ))
|
| 588 |
return true; |
| 589 |
else
|
| 590 |
return false; |
| 591 |
} |
| 592 |
} |
| 593 |
|
| 594 |
public void setListener(WMSEventListener listener) { |
| 595 |
if (listener!=null) |
| 596 |
this.theListener = listener;
|
| 597 |
} |
| 598 |
|
| 599 |
public void cancel(int opCode) { |
| 600 |
URLRequest myUrlReq; |
| 601 |
RetrieveListener myListener; |
| 602 |
switch (opCode) {
|
| 603 |
case WMSClient.GET_CAPABILITIES:
|
| 604 |
myUrlReq = capabilitiesRequest; |
| 605 |
myListener = getCapabilitiesListener; |
| 606 |
break;
|
| 607 |
case WMSClient.GET_MAP:
|
| 608 |
myUrlReq = mapRequest; |
| 609 |
myListener = getMapListener; |
| 610 |
break;
|
| 611 |
case WMSClient.GET_FEATURE_INFO:
|
| 612 |
myUrlReq = featureInfo; |
| 613 |
myListener = getFeatureInfoListener; |
| 614 |
break;
|
| 615 |
default:
|
| 616 |
System.err.println("[RemoteClients:WMSProtocolHandler] cancelling an unknown operation"); |
| 617 |
return;
|
| 618 |
} |
| 619 |
myUrlReq.removeRetrieveListener(myListener); |
| 620 |
} |
| 621 |
} |