Mercurial > dive4elements > river
view flys-client/src/main/java/de/intevation/flys/client/server/DistanceInfoServiceImpl.java @ 1575:0f2b94408bd1
Added further methods to DataFactory to create concrete Data instances.
flys-client/trunk@3841 c6561f87-3c4e-4783-a992-168aeb5c3f6f
author | Ingo Weinzierl <ingo.weinzierl@intevation.de> |
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date | Tue, 31 Jan 2012 15:20:17 +0000 |
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 :