view flys-client/src/main/java/de/intevation/flys/client/server/RiverServiceImpl.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 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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