Mercurial > dive4elements > river
view flys-client/src/main/java/de/intevation/flys/client/server/DistanceInfoServiceImpl.java @ 4488:5041105d2edd
Check if response code from GGInA is 200 OK
Only parse the GGInA response if the status code is 200 OK. This improves the
error message if GGInA is not available and shows the real reason instead of a
JDOM error while parsing the response.
author | Björn Ricks <bjoern.ricks@intevation.de> |
---|---|
date | Wed, 14 Nov 2012 10:36:21 +0100 |
parents | 6bb6d43eeb2d |
children |
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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.DistanceInfoService; import de.intevation.flys.client.shared.model.DistanceInfoObject; import de.intevation.flys.client.shared.model.DistanceInfoObjectImpl; /** * @author <a href="mailto:ingo.weinzierl@intevation.de">Ingo Weinzierl</a> */ public class DistanceInfoServiceImpl extends RemoteServiceServlet implements DistanceInfoService { private static final Logger logger = Logger.getLogger(DistanceInfoServiceImpl.class); public static final String ERROR_NO_DISTANCEINFO_FOUND = "error_no_distanceinfo_found"; public static final String XPATH_DISTANCES = "art:distances/art:distance"; public DistanceInfoObject[] getDistanceInfo( String locale, String river) throws ServerException { logger.info("DistanceInfoServiceImpl.getDistanceInfo"); 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"); riverEl.setTextContent(river); doc.appendChild(riverEl); HttpClient client = new HttpClientImpl(url, locale); try { Document result = client.callService(url, "distanceinfo", doc); logger.debug("Extract distance info objects now."); DistanceInfoObject[] objects = extractDistanceInfoObjects(result); if (objects != null && objects.length > 0) { return objects; } } catch (ConnectionException ce) { logger.error(ce, ce); } throw new ServerException(ERROR_NO_DISTANCEINFO_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 DistanceInfoObject[] extractDistanceInfoObjects(Document result) throws ServerException { NodeList list = result.getElementsByTagName("distance"); if (list == null || list.getLength() == 0) { logger.warn("No distance info found."); throw new ServerException(ERROR_NO_DISTANCEINFO_FOUND); } int num = list.getLength(); logger.debug("Response contains " + num + " objects."); List<DistanceInfoObject> objects = new ArrayList<DistanceInfoObject>(num); for (int i = 0; i < num; i++) { DistanceInfoObject obj = buildDistanceInfoObject( (Element)list.item(i)); if (obj != null) { objects.add(obj); } } logger.debug("Retrieved " + objects.size() + " distances."); return (DistanceInfoObject[]) objects.toArray(new DistanceInfoObject[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 DistanceInfoObject buildDistanceInfoObject(Element node) { String desc = node.getAttribute("description").trim(); String from = node.getAttribute("from").trim(); String to = node.getAttribute("to").trim(); String riverside = node.getAttribute("riverside").trim(); String bottom = node.getAttribute("bottom").trim(); String top = node.getAttribute("top").trim(); if (desc.length() > 0 && from.length() > 0) { try { Double f = new Double(from); Double t = to .length() > 0 ? new Double(to) : null; Double b = bottom.length() > 0 ? new Double(bottom) : null; Double tp = top .length() > 0 ? new Double(top) : null; return new DistanceInfoObjectImpl(desc, f, t, riverside, b, tp); } 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 :