--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/flys-client/src/main/java/de/intevation/flys/client/server/RiverServiceImpl.java	Wed Mar 09 08:00:06 2011 +0000
@@ -0,0 +1,83 @@
+package de.intevation.flys.client.server;
+
+import java.util.ArrayList;
+import java.util.List;
+
+import javax.xml.xpath.XPathConstants;
+
+import org.w3c.dom.Document;
+import org.w3c.dom.NodeList;
+import org.w3c.dom.Node;
+
+import com.google.gwt.user.server.rpc.RemoteServiceServlet;
+
+import de.intevation.artifacts.common.ArtifactNamespaceContext;
+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.shared.model.DefaultRiver;
+import de.intevation.flys.client.shared.model.River;
+import de.intevation.flys.client.client.services.RiverService;
+
+
+/**
+ * This interface provides a method to list the supported rivers of the artifact
+ * server.
+ *
+ * @author <a href="mailto:ingo.weinzierl@intevation.de">Ingo Weinzierl</a>
+ */
+public class RiverServiceImpl
+extends      RemoteServiceServlet
+implements   RiverService
+{
+    /** The XPath string that points to the rivers in the resulting document.*/
+    public static final String XPATH_RIVERS = "/art:rivers/art:river";
+
+
+    public River[] list(String serverUrl) {
+        Document doc      = XMLUtils.newDocument();
+
+        XMLUtils.ElementCreator ec = new XMLUtils.ElementCreator(
+            doc,
+            ArtifactNamespaceContext.NAMESPACE_URI,
+            ArtifactNamespaceContext.NAMESPACE_PREFIX);
+
+        doc.appendChild(ec.create("action"));
+
+        HttpClient client = new HttpClientImpl(serverUrl);
+
+        try {
+            Document res = client.callService(serverUrl, "rivers", doc);
+
+            NodeList rivers = (NodeList) XMLUtils.xpath(
+                res,
+                XPATH_RIVERS,
+                XPathConstants.NODESET,
+                ArtifactNamespaceContext.INSTANCE);
+
+            int count = rivers.getLength();
+
+            List<River> theRivers = new ArrayList<River>(count);
+
+            for (int i = 0; i < count; i++) {
+                Node tmp = rivers.item(i);
+
+                String name = XMLUtils.xpathString(
+                    tmp, "@art:name", ArtifactNamespaceContext.INSTANCE);
+
+                theRivers.add(new DefaultRiver(name));
+            }
+
+            return (River[]) theRivers.toArray(new River[count]);
+        }
+        catch (ConnectionException ce) {
+            System.err.println(ce.getLocalizedMessage());
+        }
+
+        return null;
+    }
+}
+// vim:set ts=4 sw=4 si et sta sts=4 fenc=utf8 :