--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/gwt-client/src/main/java/org/dive4elements/river/client/server/MapInfoServiceImpl.java	Thu Apr 25 15:23:37 2013 +0200
@@ -0,0 +1,138 @@
+package org.dive4elements.river.client.server;
+
+import com.google.gwt.core.client.GWT;
+import com.google.gwt.user.server.rpc.RemoteServiceServlet;
+
+import org.dive4elements.artifacts.common.utils.XMLUtils;
+import org.dive4elements.artifacts.common.utils.XMLUtils.ElementCreator;
+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.client.services.MapInfoService;
+import org.dive4elements.river.client.shared.exceptions.ServerException;
+import org.dive4elements.river.client.shared.model.BBox;
+import org.dive4elements.river.client.shared.model.MapInfo;
+
+import org.apache.log4j.Logger;
+import org.w3c.dom.Document;
+import org.w3c.dom.Element;
+
+
+/**
+ * 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_RIVER_LAYERS =
+        "/mapinfo/river/river-wms/@layers";
+
+    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";
+
+
+    @Override
+    public MapInfo getMapInfo(String locale, String river)
+    throws ServerException
+    {
+        logger.info("MapInfoServiceImpl.getMapInfo");
+
+        String url  = getServletContext().getInitParameter("server-url");
+
+        Document request = getRequestDocument(river, "rivermap");
+
+        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, String maptypeStr) {
+        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");
+        Element maptype = cr.create("maptype");
+
+        river.setTextContent(rivername);
+        maptype.setTextContent(maptypeStr);
+
+        request.appendChild(root);
+        root.appendChild(river);
+        root.appendChild(maptype);
+
+        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 riverLayers = XMLUtils.xpathString(result, XPATH_RIVER_LAYERS, 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) {
+            GWT.log("Could not parse SRID String: " + sridStr);
+        }
+
+        return new MapInfo(
+                river, srid, bbox, riverWMS, riverLayers, wmsURL, wmsLayers);
+    }
+}
+// vim:set ts=4 sw=4 si et sta sts=4 fenc=utf8 :