view gwt-client/src/main/java/org/dive4elements/river/client/server/GaugeInfoServiceImpl.java @ 5948:d7b9b3e3c61a

Make instantiation of saml.User easier. Most of the parameters of the constructor can be taken from the Assertion object, so there's no reason to pass them separately. Also, trying to check the validity dates isn't useful for the single sign on case. See comments in the hasExpired method.
author Bernhard Herzog <bh@intevation.de>
date Wed, 08 May 2013 17:56:14 +0200
parents 172338b1407f
children ea9eef426962
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/* Copyright (C) 2011, 2012, 2013 by Bundesanstalt für Gewässerkunde
 * Software engineering by Intevation GmbH
 *
 * This file is Free Software under the GNU AGPL (>=v3) 
 * and comes with ABSOLUTELY NO WARRANTY! Check out the
 * documentation coming with Dive4Elements River for details. 
 */

package org.dive4elements.river.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.NodeList;

import org.apache.log4j.Logger;

import com.google.gwt.user.server.rpc.RemoteServiceServlet;

import org.dive4elements.artifacts.common.ArtifactNamespaceContext;
import org.dive4elements.artifacts.common.utils.XMLUtils;

import org.dive4elements.artifacts.httpclient.exceptions.ConnectionException;
import org.dive4elements.artifacts.httpclient.http.HttpClient;
import org.dive4elements.artifacts.httpclient.http.HttpClientImpl;

import org.dive4elements.river.client.shared.exceptions.ServerException;
import org.dive4elements.river.client.client.services.GaugeInfoService;
import org.dive4elements.river.client.shared.model.Gauge;
import org.dive4elements.river.client.shared.model.GaugeImpl;


/**
 * @author <a href="mailto:ingo.weinzierl@intevation.de">Ingo Weinzierl</a>
 */
public class GaugeInfoServiceImpl
extends      RemoteServiceServlet
implements   GaugeInfoService
{
    private static final Logger logger =
        Logger.getLogger(GaugeInfoServiceImpl.class);


    public static final String ERROR_NO_GAUGES_FOUND =
        "error_no_gaugeinfo_found";

    public static final String XPATH_GAUGES = "art:service/art:gauge";


    public List<Gauge> getGaugeInfo(String rivername, String refnumber)
    throws ServerException
    {
        logger.info("GaugeInfoServiceImpl.getGaugeInfo");

        String url = getServletContext().getInitParameter("server-url");

        Document doc = XMLUtils.newDocument();

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

        Element river = ec.create("river");
        ec.addAttr(river, "name", rivername);

        if (refnumber != null && refnumber.length() > 0) {
            Element filter = ec.create("filter");
            Element gauge  = ec.create("gauge");
            gauge.setTextContent(refnumber);

            filter.appendChild(gauge);
            river.appendChild(filter);
        }

        doc.appendChild(river);

        HttpClient client = new HttpClientImpl(url);

        try {
            Document result = client.callService(url, "gaugeinfo", doc);

            logger.debug("Extract gauge info now.");
            List<Gauge> gauges = extractGauges(result);

            if (gauges != null && gauges.size() > 0) {
                return gauges;
            }
        }
        catch (ConnectionException ce) {
            logger.error(ce, ce);
        }

        throw new ServerException(ERROR_NO_GAUGES_FOUND);
    }


    /**
     * Extracts all wq info objects from <i>result</i> document.
     *
     * @param result The document retrieved by the server.
     *
     * @return a list of WQInfoObjects.
     */
    protected List<Gauge> extractGauges(Document result)
    throws    ServerException
    {
        List<Gauge> gauges = new ArrayList<Gauge>();

        NodeList list = (NodeList) XMLUtils.xpath(
            result,
            XPATH_GAUGES,
            XPathConstants.NODESET,
            ArtifactNamespaceContext.INSTANCE);

        if (list == null || list.getLength() == 0) {
            logger.warn("No gauges found.");

            throw new ServerException(ERROR_NO_GAUGES_FOUND);
        }

        int num = list.getLength();
        logger.debug("Response contains " + num + " objects.");

        for (int i = 0; i < num; i++) {
            Gauge obj = buildGauge((Element) list.item(i));

            if (obj != null) {
                gauges.add(obj);
            }
        }

        logger.debug("Retrieved " + gauges.size() + " gauges.");

        return gauges;
    }


    protected Gauge buildGauge(Element ele) {
        String name     = ele.getAttribute("name");
        String lowerStr = ele.getAttribute("lower");
        String upperStr = ele.getAttribute("upper");

        if (lowerStr != null && upperStr != null) {
            try {
                return new GaugeImpl(
                    name,
                    Double.valueOf(lowerStr),
                    Double.valueOf(upperStr));
            }
            catch (NumberFormatException nfe) {
                logger.warn("Error while Gauge creation: " + nfe.getMessage());
            }
        }

        return null;
    }
}
// vim:set ts=4 sw=4 si et sta sts=4 fenc=utf8 :

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