ingo@828: package de.intevation.flys.client.server;
ingo@828: 
ingo@828: import org.w3c.dom.Document;
ingo@828: import org.w3c.dom.Element;
ingo@828: 
ingo@1367: import org.apache.log4j.Logger;
ingo@1367: 
ingo@828: import com.google.gwt.user.server.rpc.RemoteServiceServlet;
ingo@828: 
ingo@828: import de.intevation.artifacts.common.utils.XMLUtils;
ingo@828: import de.intevation.artifacts.common.utils.XMLUtils.ElementCreator;
ingo@828: 
ingo@828: import de.intevation.artifacts.httpclient.exceptions.ConnectionException;
ingo@828: import de.intevation.artifacts.httpclient.http.HttpClient;
ingo@828: import de.intevation.artifacts.httpclient.http.HttpClientImpl;
ingo@828: 
ingo@828: import de.intevation.flys.client.shared.exceptions.ServerException;
ingo@828: import de.intevation.flys.client.shared.model.BBox;
ingo@828: import de.intevation.flys.client.shared.model.MapInfo;
ingo@828: 
ingo@828: import de.intevation.flys.client.client.services.MapInfoService;
ingo@828: 
ingo@828: 
ingo@828: /**
ingo@828:  * This service fetches a document that contains meta information for a specific
ingo@828:  * chart.
ingo@828:  *
ingo@828:  * @author <a href="mailto:ingo.weinzierl@intevation.de">Ingo Weinzierl</a>
ingo@828:  */
ingo@828: public class MapInfoServiceImpl
ingo@828: extends      RemoteServiceServlet
ingo@828: implements   MapInfoService
ingo@828: {
ingo@1367:     private static final Logger logger =
ingo@1367:         Logger.getLogger(MapInfoServiceImpl.class);
ingo@1367: 
ingo@1367: 
ingo@828:     public static final String XPATH_RIVER =
ingo@828:         "/mapinfo/river/@name";
ingo@828: 
ingo@828:     public static final String XPATH_SRID =
ingo@828:         "/mapinfo/river/srid/@value";
ingo@828: 
ingo@828:     public static final String XPATH_BBOX  =
ingo@828:         "/mapinfo/river/bbox/@value";
ingo@828: 
ingo@828:     public static final String XPATH_RIVER_WMS =
ingo@828:         "/mapinfo/river/river-wms/@url";
ingo@828: 
ingo@828:     public static final String XPATH_WMS_URL =
ingo@828:         "/mapinfo/river/background-wms/@url";
ingo@828: 
ingo@828:     public static final String XPATH_WMS_LAYERS =
ingo@828:         "/mapinfo/river/background-wms/@layers";
ingo@828: 
ingo@828:     public static final String ERROR_NO_MAPINFO_FOUND =
ingo@828:         "mapinfo_service_no_result";
ingo@828: 
ingo@828: 
ingo@828:     public MapInfo getMapInfo(String url, String locale, String river)
ingo@828:     throws ServerException
ingo@828:     {
ingo@1367:         logger.info("MapInfoServiceImpl.getMapInfo");
ingo@828: 
ingo@828:         Document request = getRequestDocument(river);;
ingo@828: 
ingo@828:         HttpClient client = new HttpClientImpl(url, locale);
ingo@828: 
ingo@828:         try {
ingo@1367:             logger.debug("MapInfoServiceImpl.callService");
ingo@828:             Document result = client.callService(url, "mapinfo", request);
ingo@828: 
ingo@828:             if (result == null) {
ingo@1367:                 logger.warn("MapInfo service returned no result.");
ingo@828:                 throw new ServerException(ERROR_NO_MAPINFO_FOUND);
ingo@828:             }
ingo@828: 
ingo@828:             return getMapInfo(result);
ingo@828:         }
ingo@828:         catch (ConnectionException ce) {
ingo@1367:             logger.error(ce, ce);
ingo@828:         }
ingo@828: 
ingo@828:         throw new ServerException(ERROR_NO_MAPINFO_FOUND);
ingo@828:     }
ingo@828: 
ingo@828: 
ingo@828:     public static Document getRequestDocument(String rivername) {
ingo@1367:         logger.debug("MapInfoServiceImpl.getRequestDocument");
ingo@828: 
ingo@828:         Document  request = XMLUtils.newDocument();
ingo@828:         ElementCreator cr = new ElementCreator(request, null, null);
ingo@828: 
ingo@828:         Element root  = cr.create("mapinfo");
ingo@828:         Element river = cr.create("river");
ingo@828: 
ingo@828:         river.setTextContent(rivername);
ingo@828: 
ingo@828:         request.appendChild(root);
ingo@828:         root.appendChild(river);
ingo@828: 
ingo@828:         return request;
ingo@828:     }
ingo@828: 
ingo@828: 
ingo@828:     public static MapInfo getMapInfo(Document result) {
ingo@1367:         logger.debug("MapInfoServiceImpl.getMapInfo");
ingo@828: 
ingo@828:         String river   = XMLUtils.xpathString(result, XPATH_RIVER, null);
ingo@828:         String sridStr = XMLUtils.xpathString(result, XPATH_SRID, null);
ingo@828:         String bboxS   = XMLUtils.xpathString(result, XPATH_BBOX,  null);
ingo@828:         BBox   bbox    = BBox.getBBoxFromString(bboxS);
ingo@828: 
ingo@828:         String riverWMS  = XMLUtils.xpathString(result, XPATH_RIVER_WMS, null);
ingo@828:         String wmsURL    = XMLUtils.xpathString(result, XPATH_WMS_URL, null);
ingo@828:         String wmsLayers = XMLUtils.xpathString(result, XPATH_WMS_LAYERS, null);
ingo@828: 
ingo@828:         int srid = 4326;
ingo@828: 
ingo@828:         try {
ingo@828:             srid = Integer.parseInt(sridStr);
ingo@828:         }
ingo@828:         catch (NumberFormatException nfe) {
ingo@828:             // do nothing
ingo@828:         }
ingo@828: 
ingo@828:         return new MapInfo(river, srid, bbox, riverWMS, wmsURL, wmsLayers);
ingo@828:     }
ingo@828: }
ingo@828: // vim:set ts=4 sw=4 si et sta sts=4 fenc=utf8 :