Mercurial > dive4elements > river
diff flys-client/src/main/java/de/intevation/flys/client/server/DischargeInfoServiceImpl.java @ 1600:67468c90ca68
Added service to request discharge infos at a specific gauge.
flys-client/trunk@3938 c6561f87-3c4e-4783-a992-168aeb5c3f6f
author | Raimund Renkert <raimund.renkert@intevation.de> |
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date | Mon, 06 Feb 2012 16:01:22 +0000 |
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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/DischargeInfoServiceImpl.java Mon Feb 06 16:01:22 2012 +0000 @@ -0,0 +1,138 @@ +package de.intevation.flys.client.server; + +import java.util.ArrayList; +import java.util.List; + +import org.w3c.dom.Document; +import org.w3c.dom.Element; +import org.w3c.dom.NodeList; + +import org.apache.log4j.Logger; + +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.shared.exceptions.ServerException; +import de.intevation.flys.client.client.services.DischargeInfoService; +import de.intevation.flys.client.shared.model.DischargeInfoObject; +import de.intevation.flys.client.shared.model.DischargeInfoObjectImpl; + + +/** + * @author <a href="mailto:raimund.renkert@intevation.de">Raimund Renkert</a> + */ +public class DischargeInfoServiceImpl +extends RemoteServiceServlet +implements DischargeInfoService +{ + private static final Logger logger = + Logger.getLogger(DischargeInfoServiceImpl.class); + + public static final String ERROR_NO_DISCHARGEINFO_FOUND = + "error_no_dischargeinfo_found"; + + public static final String XPATH_DISTANCES = "art:discharges/art:discharge"; + + + public DischargeInfoObject[] getDischargeInfo( + String locale, + long gauge) + throws ServerException + { + logger.info("DichargeInfoServiceImpl.getDischargeInfo"); + + String url = getServletContext().getInitParameter("server-url"); + + Document doc = XMLUtils.newDocument(); + + XMLUtils.ElementCreator ec = new XMLUtils.ElementCreator( + doc, + ArtifactNamespaceContext.NAMESPACE_URI, + ArtifactNamespaceContext.NAMESPACE_PREFIX); + + Element gaugeEl = ec.create("gauge"); + gaugeEl.setTextContent(String.valueOf(gauge)); + + doc.appendChild(gaugeEl); + + HttpClient client = new HttpClientImpl(url, locale); + + try { + Document result = client.callService(url, "dischargeinfo", doc); + + logger.debug("Extract discharge info objects now."); + DischargeInfoObject[] objects = extractDischargeInfoObjects(result); + + if (objects != null && objects.length > 0) { + return objects; + } + } + catch (ConnectionException ce) { + logger.error(ce, ce); + } + + throw new ServerException(ERROR_NO_DISCHARGEINFO_FOUND); + } + + protected DischargeInfoObject[] extractDischargeInfoObjects( + Document result + ) + throws ServerException { + NodeList list = result.getElementsByTagName("discharge"); + + if (list == null || list.getLength() == 0) { + logger.warn("No discharge info found."); + throw new ServerException(ERROR_NO_DISCHARGEINFO_FOUND); + } + + int num = list.getLength(); + logger.debug("Response contains " + num + " objects."); + + List<DischargeInfoObject> objects = + new ArrayList<DischargeInfoObject>(num); + + for (int i = 0; i < num; i++) { + DischargeInfoObject obj = buildDischargeInfoObject( + (Element)list.item(i)); + + if (obj != null) { + objects.add(obj); + } + } + + logger.debug("Retrieved " + objects.size() + " discharges."); + + return (DischargeInfoObject[]) + objects.toArray(new DischargeInfoObject[num]); + + } + + protected DischargeInfoObject buildDischargeInfoObject(Element node) { + + String desc = node.getAttribute("description").trim(); + String start = node.getAttribute("start").trim(); + String end = node.getAttribute("end").trim(); + + if (start.length() > 0 && end.length() > 0) { + try { + Integer startYear = new Integer(start); + Integer endYear = new Integer(end); + return new DischargeInfoObjectImpl(desc, startYear, endYear); + } + catch (NumberFormatException nfe) { + logger.warn(nfe.getLocalizedMessage()); + } + } + + logger.warn("Invalid distance info object found."); + + return null; + } +} +// vim:set ts=4 sw=4 si et sta sts=4 fenc=utf8 :