Mercurial > dive4elements > river
view flys-client/src/main/java/de/intevation/flys/client/server/DistanceInfoServiceImpl.java @ 284:be842e36ce1c
ISSUE 46: Removed the table header context menu.
flys-client/trunk@1913 c6561f87-3c4e-4783-a992-168aeb5c3f6f
author | Raimund Renkert <raimund.renkert@intevation.de> |
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date | Thu, 12 May 2011 15:42:37 +0000 |
parents | 924da6695800 |
children | d9fc58e30a53 |
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package de.intevation.flys.client.server; import java.util.ArrayList; import java.util.List; import javax.xml.xpath.XPathConstants; import org.w3c.dom.Document; import org.w3c.dom.Element; import org.w3c.dom.Node; 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.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 { 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 url, String locale, String river) throws ServerException { System.out.println("DistanceInfoServiceImpl.getDistanceInfo"); 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); System.out.println("Extract distance info objects now."); DistanceInfoObject[] objects = extractDistanceInfoObjects(result); if (objects != null && objects.length > 0) { return objects; } } catch (ConnectionException ce) { System.err.println(ce.getLocalizedMessage()); } 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 = (NodeList) XMLUtils.xpath( result, XPATH_DISTANCES, XPathConstants.NODESET, ArtifactNamespaceContext.INSTANCE); if (list == null || list.getLength() == 0) { System.err.println("No distance info found."); throw new ServerException(ERROR_NO_DISTANCEINFO_FOUND); } int num = list.getLength(); System.out.println("Response contains " + num + " objects."); List<DistanceInfoObject> objects = new ArrayList<DistanceInfoObject>(num); for (int i = 0; i < num; i++) { DistanceInfoObject obj = buildDistanceInfoObject(list.item(i)); if (obj != null) { objects.add(obj); } } System.out.println("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(Node node) { String desc = XMLUtils.xpathString( node, "@art:description", ArtifactNamespaceContext.INSTANCE); String from = XMLUtils.xpathString( node, "@art:from", ArtifactNamespaceContext.INSTANCE); String to = XMLUtils.xpathString( node, "@art:to", ArtifactNamespaceContext.INSTANCE); String riverside = XMLUtils.xpathString( node, "@art:riverside", ArtifactNamespaceContext.INSTANCE); if (desc != null && from != null) { try { return new DistanceInfoObjectImpl( desc, new Double(from), to != null && to.trim().length() > 0 ? new Double(to) : null, riverside); } catch (NumberFormatException nfe) { System.err.println(nfe.getLocalizedMessage()); } } System.err.println("Invalid distance info object found."); return null; } } // vim:set ts=4 sw=4 si et sta sts=4 fenc=utf8 :