view flys-client/src/main/java/de/intevation/flys/client/server/ThemeListingServiceImpl.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 37dce0f2f63b
children
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package de.intevation.flys.client.server;

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

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.ThemeListingService;

import de.intevation.flys.client.shared.exceptions.ServerException;

import de.intevation.flys.client.shared.model.Style;

import java.util.HashMap;
import java.util.Map;

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 themes filtered by name.
 *
 * @author <a href="mailto:raimund.renkert@intevation.de">Raimund Renkert</a>
 */
public class ThemeListingServiceImpl
extends      RemoteServiceServlet
implements   ThemeListingService
{
    private static final Logger logger =
        Logger.getLogger(ThemeListingServiceImpl.class);


    private static final String XPATH_THEME_GROUPS = "/themes/themegroup";
    /** The error message key that is thrown if an error occured while reading
     * the supported rivers from server.*/
    public static final String ERROR_NO_GROUPS_FOUND = "error_no_groups_found";


    public Map<String, Style> list(String locale, String name)
    throws ServerException
    {
        String url = getServletContext().getInitParameter("server-url");

        Document doc = XMLUtils.newDocument();

        XMLUtils.ElementCreator ec = new XMLUtils.ElementCreator(
            doc,
            null,
            null);

        Element e = ec.create("theme");
        ec.addAttr(e, "name", name);
        doc.appendChild(e);
        HttpClient client = new HttpClientImpl(url, locale);

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

            NodeList themeGroups = (NodeList) XMLUtils.xpath(
                res,
                XPATH_THEME_GROUPS,
                XPathConstants.NODESET,
                null);

            if (themeGroups == null || themeGroups.getLength() == 0) {
                throw new ServerException(ERROR_NO_GROUPS_FOUND);
            }

            int count = themeGroups.getLength();

            Map<String, Style> theStyles = new HashMap<String, Style>(count);

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

                String groupName = tmp.getAttribute("name");
                NodeList theTheme = (NodeList) XMLUtils.xpath(
                    tmp,
                    "theme",
                    XPathConstants.NODESET,
                    null);

                for (int j = 0; j < theTheme.getLength(); j++) {
                    Element elem = (Element) theTheme.item(j);
                    theStyles.put(groupName, StyleHelper.getStyle(elem));
                }
            }

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

        throw new ServerException(ERROR_NO_GROUPS_FOUND);
    }
}
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