--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/flys-client/src/main/java/org/dive4elements/river/client/server/DischargeInfoServiceImpl.java	Thu Apr 25 12:31:32 2013 +0200
@@ -0,0 +1,138 @@
+package de.intevation.flys.client.server;
+
+import java.util.ArrayList;
+import java.util.List;
+
+import org.w3c.dom.Document;
+import org.w3c.dom.Element;
+import org.w3c.dom.NodeList;
+
+import org.apache.log4j.Logger;
+
+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.exceptions.ServerException;
+import de.intevation.flys.client.client.services.DischargeInfoService;
+import de.intevation.flys.client.shared.model.DischargeInfoObject;
+import de.intevation.flys.client.shared.model.DischargeInfoObjectImpl;
+
+
+/**
+ * @author <a href="mailto:raimund.renkert@intevation.de">Raimund Renkert</a>
+ */
+public class DischargeInfoServiceImpl
+extends      RemoteServiceServlet
+implements   DischargeInfoService
+{
+    private static final Logger logger =
+        Logger.getLogger(DischargeInfoServiceImpl.class);
+
+    public static final String ERROR_NO_DISCHARGEINFO_FOUND =
+        "error_no_dischargeinfo_found";
+
+    public static final String XPATH_DISTANCES = "art:discharges/art:discharge";
+
+
+    public DischargeInfoObject[] getDischargeInfo(
+        String locale,
+        long gauge)
+    throws ServerException
+    {
+        logger.info("DichargeInfoServiceImpl.getDischargeInfo");
+
+        String url  = getServletContext().getInitParameter("server-url");
+
+        Document doc = XMLUtils.newDocument();
+
+        XMLUtils.ElementCreator ec = new XMLUtils.ElementCreator(
+            doc,
+            ArtifactNamespaceContext.NAMESPACE_URI,
+            ArtifactNamespaceContext.NAMESPACE_PREFIX);
+
+        Element gaugeEl = ec.create("gauge");
+        gaugeEl.setTextContent(String.valueOf(gauge));
+
+        doc.appendChild(gaugeEl);
+
+        HttpClient client = new HttpClientImpl(url, locale);
+
+        try {
+            Document result = client.callService(url, "dischargeinfo", doc);
+
+            logger.debug("Extract discharge info objects now.");
+            DischargeInfoObject[] objects = extractDischargeInfoObjects(result);
+
+            if (objects != null && objects.length > 0) {
+                return objects;
+            }
+        }
+        catch (ConnectionException ce) {
+            logger.error(ce, ce);
+        }
+
+        throw new ServerException(ERROR_NO_DISCHARGEINFO_FOUND);
+    }
+
+    protected DischargeInfoObject[] extractDischargeInfoObjects(
+        Document result
+    )
+    throws ServerException {
+        NodeList list = result.getElementsByTagName("discharge");
+
+        if (list == null || list.getLength() == 0) {
+            logger.warn("No discharge info found.");
+            throw new ServerException(ERROR_NO_DISCHARGEINFO_FOUND);
+        }
+
+        int num = list.getLength();
+        logger.debug("Response contains " + num + " objects.");
+
+        List<DischargeInfoObject> objects =
+            new ArrayList<DischargeInfoObject>(num);
+
+        for (int i = 0; i < num; i++) {
+            DischargeInfoObject obj = buildDischargeInfoObject(
+                (Element)list.item(i));
+
+            if (obj != null) {
+                objects.add(obj);
+            }
+        }
+
+        logger.debug("Retrieved " + objects.size() + " discharges.");
+
+        return (DischargeInfoObject[])
+            objects.toArray(new DischargeInfoObject[num]);
+
+    }
+
+    protected DischargeInfoObject buildDischargeInfoObject(Element node) {
+
+        String desc      = node.getAttribute("description").trim();
+        String start     = node.getAttribute("start").trim();
+        String end       = node.getAttribute("end").trim();
+
+        if (start.length() > 0 && end.length() > 0) {
+            try {
+                Integer startYear  = new Integer(start);
+                Integer endYear    = new Integer(end);
+                return new DischargeInfoObjectImpl(desc, startYear, endYear);
+            }
+            catch (NumberFormatException nfe) {
+                logger.warn(nfe.getLocalizedMessage());
+            }
+        }
+
+        logger.warn("Invalid distance info object found.");
+
+        return null;
+    }
+}
+// vim:set ts=4 sw=4 si et sta sts=4 fenc=utf8 :