view flys-client/src/main/java/de/intevation/flys/client/server/MapInfoServiceImpl.java @ 3497:88feb3347aa5

Implement a ProxyServlet Implement a ProxyServlet to be able to restrict the access to the mapserver too. All queries to the provided map services should go throught this new ProxyServlet. Currently the ProxyServlet can only handle HTTP GET requests. flys-client/trunk@5221 c6561f87-3c4e-4783-a992-168aeb5c3f6f
author Bjoern Ricks <bjoern.ricks@intevation.de>
date Thu, 16 Aug 2012 14:42:36 +0000
parents bc06a671ef60
children 02cf2b1dff84
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package de.intevation.flys.client.server;

import org.w3c.dom.Document;
import org.w3c.dom.Element;

import org.apache.log4j.Logger;

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

import de.intevation.artifacts.common.utils.XMLUtils;
import de.intevation.artifacts.common.utils.XMLUtils.ElementCreator;

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.shared.model.BBox;
import de.intevation.flys.client.shared.model.MapInfo;

import de.intevation.flys.client.client.services.MapInfoService;


/**
 * This service fetches a document that contains meta information for a specific
 * chart.
 *
 * @author <a href="mailto:ingo.weinzierl@intevation.de">Ingo Weinzierl</a>
 */
public class MapInfoServiceImpl
extends      RemoteServiceServlet
implements   MapInfoService
{
    private static final Logger logger =
        Logger.getLogger(MapInfoServiceImpl.class);


    public static final String XPATH_RIVER =
        "/mapinfo/river/@name";

    public static final String XPATH_SRID =
        "/mapinfo/river/srid/@value";

    public static final String XPATH_BBOX  =
        "/mapinfo/river/bbox/@value";

    public static final String XPATH_RIVER_WMS =
        "/mapinfo/river/river-wms/@url";

    public static final String XPATH_WMS_URL =
        "/mapinfo/river/background-wms/@url";

    public static final String XPATH_WMS_LAYERS =
        "/mapinfo/river/background-wms/@layers";

    public static final String ERROR_NO_MAPINFO_FOUND =
        "mapinfo_service_no_result";


    public MapInfo getMapInfo(String locale, String river)
    throws ServerException
    {
        logger.info("MapInfoServiceImpl.getMapInfo");

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

        Document request = getRequestDocument(river);;

        HttpClient client = new HttpClientImpl(url, locale);

        try {
            logger.debug("MapInfoServiceImpl.callService");
            Document result = client.callService(url, "mapinfo", request);

            if (result == null) {
                logger.warn("MapInfo service returned no result.");
                throw new ServerException(ERROR_NO_MAPINFO_FOUND);
            }

            return getMapInfo(result);
        }
        catch (ConnectionException ce) {
            logger.error(ce, ce);
        }

        throw new ServerException(ERROR_NO_MAPINFO_FOUND);
    }


    public static Document getRequestDocument(String rivername) {
        logger.debug("MapInfoServiceImpl.getRequestDocument");

        Document  request = XMLUtils.newDocument();
        ElementCreator cr = new ElementCreator(request, null, null);

        Element root  = cr.create("mapinfo");
        Element river = cr.create("river");

        river.setTextContent(rivername);

        request.appendChild(root);
        root.appendChild(river);

        return request;
    }


    public static MapInfo getMapInfo(Document result) {
        logger.debug("MapInfoServiceImpl.getMapInfo");

        String river   = XMLUtils.xpathString(result, XPATH_RIVER, null);
        String sridStr = XMLUtils.xpathString(result, XPATH_SRID, null);
        String bboxS   = XMLUtils.xpathString(result, XPATH_BBOX,  null);
        BBox   bbox    = BBox.getBBoxFromString(bboxS);

        String riverWMS  = XMLUtils.xpathString(result, XPATH_RIVER_WMS, null);
        String wmsURL    = XMLUtils.xpathString(result, XPATH_WMS_URL, null);
        String wmsLayers = XMLUtils.xpathString(result, XPATH_WMS_LAYERS, null);

        int srid = 4326;

        try {
            srid = Integer.parseInt(sridStr);
        }
        catch (NumberFormatException nfe) {
            // do nothing
        }

        return new MapInfo(river, srid, bbox, riverWMS, wmsURL, wmsLayers);
    }
}
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