ingo@1408: package de.intevation.flys.client.server;
ingo@1408: 
ingo@1408: import java.io.InputStream;
ingo@1408: import java.io.IOException;
ingo@1408: import java.net.MalformedURLException;
ingo@1408: import java.net.URL;
ingo@1408: import java.net.URLConnection;
ingo@1408: 
ingo@1408: import javax.xml.xpath.XPathConstants;
ingo@1408: 
ingo@1408: import com.google.gwt.user.server.rpc.RemoteServiceServlet;
ingo@1408: 
ingo@1408: import org.w3c.dom.Document;
ingo@1408: 
ingo@1408: import org.apache.log4j.Logger;
ingo@1408: 
ingo@1408: import de.intevation.artifacts.common.utils.XMLUtils;
ingo@1408: 
ingo@1408: import de.intevation.flys.client.shared.exceptions.ServerException;
ingo@1408: import de.intevation.flys.client.shared.model.Capabilities;
ingo@1408: import de.intevation.flys.client.client.services.GCService;
ingo@1408: 
ingo@1408: 
ingo@1408: /**
ingo@1408:  * @author <a href="mailto:ingo.weinzierl@intevation.de">Ingo Weinzierl</a>
ingo@1408:  */
ingo@1408: public class GCServiceImpl
ingo@1408: extends      RemoteServiceServlet
ingo@1408: implements   GCService
ingo@1408: {
ingo@1408:     public static final String ERR_GC_REQUEST_FAILED =
ingo@1408:         "error_gc_req_failed";
ingo@1408: 
ingo@1408:     public static final String ERR_GC_DOC_NOT_VALID =
ingo@1408:         "error_gc_doc_not_valid";
ingo@1408: 
ingo@1408:     public static final String ERR_MALFORMED_URL =
ingo@1408:         "error_malformed_url";
ingo@1408: 
ingo@1408:     public static final String XPATH_FEES =
ingo@1408:         "/WMS_Capabilities/Service/Fees/text()";
ingo@1408: 
ingo@1408:     public static final String XPATH_ACCESS_CONSTRAINTS =
ingo@1408:         "/WMS_Capabilities/Service/AccessConstraints/text()";
ingo@1408: 
ingo@1408: 
ingo@1408:     private Logger logger = Logger.getLogger(GCServiceImpl.class);
ingo@1408: 
ingo@1408: 
ingo@1408:     public Capabilities query(String path)
ingo@1408:     throws ServerException
ingo@1408:     {
ingo@1408:         logger.info("GCServiceImpl.query");
ingo@1408: 
ingo@1408:         try {
ingo@1408:             URL url = new URL(path);
ingo@1408: 
ingo@1408:             logger.debug("Open connection to url: " + path);
ingo@1408: 
ingo@1408:             URLConnection conn = url.openConnection();
ingo@1408:             conn.connect();
ingo@1408: 
ingo@1408:             InputStream is = conn.getInputStream();
ingo@1408: 
ingo@1408:             return parseCapabilitiesResponse(is);
ingo@1408:         }
ingo@1408:         catch (MalformedURLException mue) {
ingo@1408:             logger.warn(mue, mue);
ingo@1408:             throw new ServerException(ERR_MALFORMED_URL);
ingo@1408:         }
ingo@1408:         catch (IOException ioe) {
ingo@1408:             logger.warn(ioe, ioe);
ingo@1408:         }
ingo@1408: 
ingo@1408:         throw new ServerException(ERR_GC_REQUEST_FAILED);
ingo@1408:     }
ingo@1408: 
ingo@1408: 
ingo@1408:     protected Capabilities parseCapabilitiesResponse(InputStream is)
ingo@1408:     throws ServerException
ingo@1408:     {
ingo@1408:         logger.debug("GCServiceImpl.parseCapabilitiesResponse");
ingo@1408: 
ingo@1408:         Document doc = XMLUtils.parseDocument(is, false);
ingo@1408: 
ingo@1408:         if (doc == null) {
ingo@1408:             throw new ServerException(ERR_GC_DOC_NOT_VALID);
ingo@1408:         }
ingo@1408: 
ingo@1408:         String fees = (String) XMLUtils.xpath(
ingo@1408:             doc,
ingo@1408:             XPATH_FEES,
ingo@1408:             XPathConstants.STRING);
ingo@1408: 
ingo@1408:         String accessConstraints = (String) XMLUtils.xpath(
ingo@1408:             doc,
ingo@1408:             XPATH_ACCESS_CONSTRAINTS,
ingo@1408:             XPathConstants.STRING);
ingo@1408: 
ingo@1408:         logger.debug("Found fees: " + fees);
ingo@1408:         logger.debug("Found access constraints: " + accessConstraints);
ingo@1408: 
ingo@1408:         // TODO PARSE LAYERS
ingo@1408: 
ingo@1408:         return new Capabilities(fees, accessConstraints, null);
ingo@1408:     }
ingo@1408: }
ingo@1408: // vim:set ts=4 sw=4 si et sta sts=4 fenc=utf8 :