teichmann@5861: /* Copyright (C) 2011, 2012, 2013 by Bundesanstalt für Gewässerkunde
teichmann@5861:  * Software engineering by Intevation GmbH
teichmann@5861:  *
teichmann@5993:  * This file is Free Software under the GNU AGPL (>=v3)
teichmann@5861:  * and comes with ABSOLUTELY NO WARRANTY! Check out the
teichmann@5993:  * documentation coming with Dive4Elements River for details.
teichmann@5861:  */
teichmann@5861: 
teichmann@5835: package org.dive4elements.river.client.server;
raimund@2540: 
raimund@2540: import com.google.gwt.user.server.rpc.RemoteServiceServlet;
raimund@2540: 
teichmann@5835: import org.dive4elements.artifacts.common.utils.XMLUtils;
sascha@2911: 
teichmann@5835: import org.dive4elements.artifacts.httpclient.exceptions.ConnectionException;
raimund@2540: 
teichmann@5835: import org.dive4elements.artifacts.httpclient.http.HttpClient;
teichmann@5835: import org.dive4elements.artifacts.httpclient.http.HttpClientImpl;
raimund@2540: 
teichmann@5835: import org.dive4elements.river.client.client.services.ThemeListingService;
sascha@2911: 
teichmann@5835: import org.dive4elements.river.client.shared.exceptions.ServerException;
teichmann@5835: 
teichmann@5835: import org.dive4elements.river.client.shared.model.Style;
sascha@2911: 
sascha@2911: import java.util.HashMap;
sascha@2911: import java.util.Map;
sascha@2911: 
sascha@2911: import javax.xml.xpath.XPathConstants;
sascha@2911: 
sascha@2911: import org.apache.log4j.Logger;
sascha@2911: 
sascha@2911: import org.w3c.dom.Document;
sascha@2911: import org.w3c.dom.Element;
sascha@2911: import org.w3c.dom.NodeList;
raimund@2540: 
raimund@2540: /**
raimund@2540:  * This interface provides a method to list themes filtered by name.
raimund@2540:  *
raimund@2540:  * @author <a href="mailto:raimund.renkert@intevation.de">Raimund Renkert</a>
raimund@2540:  */
raimund@2540: public class ThemeListingServiceImpl
raimund@2540: extends      RemoteServiceServlet
raimund@2540: implements   ThemeListingService
raimund@2540: {
teichmann@8203:     private static final Logger log =
raimund@2540:         Logger.getLogger(ThemeListingServiceImpl.class);
raimund@2540: 
raimund@2540: 
raimund@2540:     private static final String XPATH_THEME_GROUPS = "/themes/themegroup";
raimund@2540:     /** The error message key that is thrown if an error occured while reading
raimund@2540:      * the supported rivers from server.*/
raimund@2540:     public static final String ERROR_NO_GROUPS_FOUND = "error_no_groups_found";
raimund@2540: 
raimund@2540: 
raimund@2540:     public Map<String, Style> list(String locale, String name)
raimund@2540:     throws ServerException
raimund@2540:     {
raimund@2540:         String url = getServletContext().getInitParameter("server-url");
raimund@2540: 
raimund@2540:         Document doc = XMLUtils.newDocument();
raimund@2540: 
raimund@2540:         XMLUtils.ElementCreator ec = new XMLUtils.ElementCreator(
raimund@2540:             doc,
raimund@2540:             null,
raimund@2540:             null);
raimund@2540: 
raimund@2540:         Element e = ec.create("theme");
raimund@2540:         ec.addAttr(e, "name", name);
raimund@2540:         doc.appendChild(e);
raimund@2540:         HttpClient client = new HttpClientImpl(url, locale);
raimund@2540: 
raimund@2540:         try {
raimund@2540:             Document res = client.callService(url, "themelisting", doc);
raimund@2540: 
raimund@2540:             NodeList themeGroups = (NodeList) XMLUtils.xpath(
raimund@2540:                 res,
raimund@2540:                 XPATH_THEME_GROUPS,
raimund@2540:                 XPathConstants.NODESET,
raimund@2540:                 null);
raimund@2540: 
raimund@2540:             if (themeGroups == null || themeGroups.getLength() == 0) {
raimund@2540:                 throw new ServerException(ERROR_NO_GROUPS_FOUND);
raimund@2540:             }
raimund@2540: 
raimund@2540:             int count = themeGroups.getLength();
raimund@2540: 
raimund@2540:             Map<String, Style> theStyles = new HashMap<String, Style>(count);
raimund@2540: 
raimund@2540:             for (int i = 0; i < count; i++) {
raimund@2540:                 Element tmp = (Element)themeGroups.item(i);
raimund@2540: 
raimund@2540:                 String groupName = tmp.getAttribute("name");
raimund@2540:                 NodeList theTheme = (NodeList) XMLUtils.xpath(
raimund@2540:                     tmp,
raimund@2540:                     "theme",
raimund@2540:                     XPathConstants.NODESET,
raimund@2540:                     null);
raimund@2540: 
raimund@2540:                 for (int j = 0; j < theTheme.getLength(); j++) {
raimund@2540:                     Element elem = (Element) theTheme.item(j);
ingo@2908:                     theStyles.put(groupName, StyleHelper.getStyle(elem));
raimund@2540:                 }
raimund@2540:             }
raimund@2540: 
raimund@2540:             return theStyles;
raimund@2540:         }
raimund@2540:         catch (ConnectionException ce) {
teichmann@8203:             log.error(ce, ce);
raimund@2540:         }
raimund@2540: 
raimund@2540:         throw new ServerException(ERROR_NO_GROUPS_FOUND);
raimund@2540:     }
raimund@2540: }
raimund@2540: // vim:set ts=4 sw=4 si et sta sts=4 fenc=utf8 :