view flys-client/src/main/java/de/intevation/flys/client/server/RiverServiceImpl.java @ 4241:49cb65d5932d

Improved the historical discharge calculation. The calculation now creates new HistoricalWQKms (new subclass of WQKms). Those WQKms are used to create new facets from (new) type 'HistoricalDischargeCurveFacet'. The chart generator is improved to support those facets.
author Ingo Weinzierl <ingo.weinzierl@intevation.de>
date Wed, 24 Oct 2012 14:34:35 +0200
parents fed914a42a10
children
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package de.intevation.flys.client.server;

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.RiverService;
import de.intevation.flys.client.server.auth.User;
import de.intevation.flys.client.shared.exceptions.ServerException;
import de.intevation.flys.client.shared.model.DefaultRiver;
import de.intevation.flys.client.shared.model.River;

import java.util.ArrayList;
import java.util.List;

import javax.xml.xpath.XPathConstants;

import org.apache.log4j.Logger;
import org.w3c.dom.Document;
import org.w3c.dom.Element;
import org.w3c.dom.NodeList;


/**
 * This interface provides a method to list the supported rivers of the artifact
 * server.
 *
 * @author <a href="mailto:ingo.weinzierl@intevation.de">Ingo Weinzierl</a>
 */
public class RiverServiceImpl
extends      RemoteServiceServlet
implements   RiverService
{
    /** Private logger. */
    private static final Logger logger =
        Logger.getLogger(RiverServiceImpl.class);

    /** The XPath string that points to the rivers in the resulting document.*/
    public static final String XPATH_RIVERS = "/art:rivers/art:river";

    /** The error message key that is thrown if an error occured while reading
     * the supported rivers from server.*/
    public static final String ERROR_NO_RIVERS_FOUND = "error_no_rivers_found";


    /** Get river list. */
    @Override
    public River[] list(String locale)
    throws ServerException
    {
        String url = getServletContext().getInitParameter("server-url");

        Document doc = XMLUtils.newDocument();

        XMLUtils.ElementCreator ec = new XMLUtils.ElementCreator(
            doc,
            ArtifactNamespaceContext.NAMESPACE_URI,
            ArtifactNamespaceContext.NAMESPACE_PREFIX);

        doc.appendChild(ec.create("action"));

        HttpClient client = new HttpClientImpl(url, locale);

        try {
            Document res = client.callService(url, "rivers", doc);

            NodeList rivers = (NodeList) XMLUtils.xpath(
                res,
                XPATH_RIVERS,
                XPathConstants.NODESET,
                ArtifactNamespaceContext.INSTANCE);

            if (rivers == null || rivers.getLength() == 0) {
                throw new ServerException(ERROR_NO_RIVERS_FOUND);
            }

            int count = rivers.getLength();

            List<River> theRivers = new ArrayList<River>(count);
            User user = this.getUser();

            for (int i = 0; i < count; i++) {
                Element tmp = (Element)rivers.item(i);

                String name = tmp.getAttributeNS(
                    ArtifactNamespaceContext.NAMESPACE_URI, "name");

                if (name.length() > 0
                && (user == null || user.canUseFeature("river:" + name))) {
                    theRivers.add(new DefaultRiver(name));
                }
            }

            return theRivers.toArray(new River[theRivers.size()]);
        }
        catch (ConnectionException ce) {
            logger.error(ce, ce);
        }

        throw new ServerException(ERROR_NO_RIVERS_FOUND);
    }
}
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