Mercurial > dive4elements > river
diff flys-client/src/main/java/de/intevation/flys/client/server/SedimentLoadInfoServiceImpl.java @ 4298:1f98a3a89e13
New client side service for sediment load infos.
The service requests an sediment load overview and creates info objects for the
received data.
author | Raimund Renkert <rrenkert@intevation.de> |
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date | Mon, 29 Oct 2012 13:13:23 +0100 |
parents | |
children |
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--- /dev/null Thu Jan 01 00:00:00 1970 +0000 +++ b/flys-client/src/main/java/de/intevation/flys/client/server/SedimentLoadInfoServiceImpl.java Mon Oct 29 13:13:23 2012 +0100 @@ -0,0 +1,152 @@ +package de.intevation.flys.client.server; + +import java.util.ArrayList; +import java.util.List; + +import org.apache.log4j.Logger; +import org.w3c.dom.Document; +import org.w3c.dom.Element; +import org.w3c.dom.NodeList; + +import com.google.gwt.user.server.rpc.RemoteServiceServlet; + +import de.intevation.artifacts.common.ArtifactNamespaceContext; +import de.intevation.artifacts.common.utils.XMLUtils; +import de.intevation.artifacts.httpclient.exceptions.ConnectionException; +import de.intevation.artifacts.httpclient.http.HttpClient; +import de.intevation.artifacts.httpclient.http.HttpClientImpl; +import de.intevation.flys.client.client.services.SedimentLoadInfoService; +import de.intevation.flys.client.shared.exceptions.ServerException; +import de.intevation.flys.client.shared.model.SedimentLoadInfoObject; +import de.intevation.flys.client.shared.model.SedimentLoadInfoObjectImpl; + + +public class SedimentLoadInfoServiceImpl +extends RemoteServiceServlet +implements SedimentLoadInfoService +{ + private static final Logger logger = + Logger.getLogger(SedimentLoadInfoServiceImpl.class); + + public static final String ERROR_NO_SEDIMENTLOADINFO_FOUND = + "error_no_sedimentloadinfo_found"; + + @Override + public SedimentLoadInfoObject[] getSedimentLoadInfo( + String locale, + String river, + String type, + double startKm, + double endKm) + throws ServerException + { + logger.info("SedimentLoadInfoServiceImpl.getSedimentLoadInfo"); + + String url = getServletContext().getInitParameter("server-url"); + + Document doc = XMLUtils.newDocument(); + + XMLUtils.ElementCreator ec = new XMLUtils.ElementCreator( + doc, + ArtifactNamespaceContext.NAMESPACE_URI, + ArtifactNamespaceContext.NAMESPACE_PREFIX); + + Element riverEl = ec.create("river"); + Element location = ec.create("location"); + Element from = ec.create("from"); + Element to = ec.create("to"); + Element typeEl = ec.create("type"); + riverEl.setTextContent(river); + from.setTextContent(String.valueOf(startKm)); + to.setTextContent(String.valueOf(endKm)); + typeEl.setTextContent(type); + + location.appendChild(from); + location.appendChild(to); + riverEl.appendChild(location); + riverEl.appendChild(typeEl); + doc.appendChild(riverEl); + + HttpClient client = new HttpClientImpl(url, locale); + + try { + Document result = client.callService(url, "sedimentloadinfo", doc); + + logger.debug("Extract sedimentload info objects now."); + SedimentLoadInfoObject[] objects = + extractSedimentLoadInfoObjects(result); + + if (objects != null && objects.length > 0) { + return objects; + } + } + catch (ConnectionException ce) { + logger.error(ce, ce); + } + + throw new ServerException(ERROR_NO_SEDIMENTLOADINFO_FOUND); + } + + + /** + * Extracts all distance info objects from <i>result</i> document. + * + * @param result The document retrieved by the server. + * + * @return a list of DistanceInfoObjects. + */ + protected SedimentLoadInfoObject[] extractSedimentLoadInfoObjects( + Document result) + throws ServerException + { + NodeList list = result.getElementsByTagName("sedimentload"); + + if (list == null || list.getLength() == 0) { + logger.warn("No sedimentload info found."); + throw new ServerException(ERROR_NO_SEDIMENTLOADINFO_FOUND); + } + + int num = list.getLength(); + logger.debug("Response contains " + num + " objects."); + + List<SedimentLoadInfoObject> objects = + new ArrayList<SedimentLoadInfoObject>(num); + + for (int i = 0; i < num; i++) { + SedimentLoadInfoObject obj = buildSedimentLoadInfoObject( + (Element)list.item(i)); + + if (obj != null) { + objects.add(obj); + } + } + + logger.debug("Retrieved " + objects.size() + " sediment loads."); + + return (SedimentLoadInfoObject[]) + objects.toArray(new SedimentLoadInfoObject[num]); + } + + + /** + * Extracts information for a single distance info object and intializes an + * DistanceInfoObject with them. + * + * @param node The node that contains the information. + * + * @return a valid DistanceInfoObject. + */ + protected SedimentLoadInfoObject buildSedimentLoadInfoObject(Element node) { + + String desc = node.getAttribute("description").trim(); + String date = node.getAttribute("date").trim(); + + if (desc.length() > 0 && date.length() > 0) { + return new SedimentLoadInfoObjectImpl(desc, date); + } + + logger.warn("Invalid sediment load info object found."); + + return null; + } +}