# HG changeset patch
# User Ingo Weinzierl <ingo.weinzierl@intevation.de>
# Date 1332248223 0
# Node ID 52a98e1653c18a297a085c95fa5651ba79ecb01a
# Parent  ca40a5b1bb04adeb24b9f669fa840213cf3a25eb
Added a new RPC service to fetch gauge information.

flys-client/trunk@4173 c6561f87-3c4e-4783-a992-168aeb5c3f6f

diff -r ca40a5b1bb04 -r 52a98e1653c1 flys-client/ChangeLog
--- a/flys-client/ChangeLog	Tue Mar 20 12:55:27 2012 +0000
+++ b/flys-client/ChangeLog	Tue Mar 20 12:57:03 2012 +0000
@@ -1,3 +1,12 @@
+2012-03-20  Ingo Weinzierl <ingo@intevation.de>
+
+	* src/main/java/de/intevation/flys/client/server/GaugeInfoServiceImpl.java,
+	  src/main/java/de/intevation/flys/client/client/services/GaugeInfoService.java,
+	  src/main/java/de/intevation/flys/client/client/services/GaugeInfoServiceAsync.java:
+	  New service to fetch information of gauges for a specific river.
+
+	* src/main/webapp/WEB-INF/web.xml: Registered the gauge info service.
+
 2012-03-20  Ingo Weinzierl <ingo@intevation.de>
 
 	* src/main/java/de/intevation/flys/client/shared/model/GaugeImpl.java,
diff -r ca40a5b1bb04 -r 52a98e1653c1 flys-client/src/main/java/de/intevation/flys/client/client/services/GaugeInfoService.java
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/flys-client/src/main/java/de/intevation/flys/client/client/services/GaugeInfoService.java	Tue Mar 20 12:57:03 2012 +0000
@@ -0,0 +1,20 @@
+package de.intevation.flys.client.client.services;
+
+import java.util.List;
+
+import com.google.gwt.user.client.rpc.RemoteService;
+import com.google.gwt.user.client.rpc.RemoteServiceRelativePath;
+
+import de.intevation.flys.client.shared.exceptions.ServerException;
+import de.intevation.flys.client.shared.model.Gauge;
+
+/**
+ * @author <a href="mailto:raimund.renkert@intevation.de">Raimund Renkert</a>
+ */
+@RemoteServiceRelativePath("gaugeinfo")
+public interface GaugeInfoService extends RemoteService {
+
+    List<Gauge> getGaugeInfo(String river, String  refnumber)
+    throws ServerException;
+}
+// vim:set ts=4 sw=4 si et sta sts=4 fenc=utf8 :
diff -r ca40a5b1bb04 -r 52a98e1653c1 flys-client/src/main/java/de/intevation/flys/client/client/services/GaugeInfoServiceAsync.java
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/flys-client/src/main/java/de/intevation/flys/client/client/services/GaugeInfoServiceAsync.java	Tue Mar 20 12:57:03 2012 +0000
@@ -0,0 +1,20 @@
+package de.intevation.flys.client.client.services;
+
+import java.util.List;
+
+import com.google.gwt.user.client.rpc.AsyncCallback;
+
+import de.intevation.flys.client.shared.model.Gauge;
+
+
+/**
+ * @author <a href="mailto:raimund.renkert@intevation.de">Raimund Renkert</a>
+ */
+public interface GaugeInfoServiceAsync {
+
+    void getGaugeInfo(
+        String river,
+        String refnumber,
+        AsyncCallback<List<Gauge>> gauges);
+}
+// vim:set ts=4 sw=4 si et sta sts=4 fenc=utf8 :
diff -r ca40a5b1bb04 -r 52a98e1653c1 flys-client/src/main/java/de/intevation/flys/client/server/GaugeInfoServiceImpl.java
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/flys-client/src/main/java/de/intevation/flys/client/server/GaugeInfoServiceImpl.java	Tue Mar 20 12:57:03 2012 +0000
@@ -0,0 +1,155 @@
+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.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.GaugeInfoService;
+import de.intevation.flys.client.shared.model.Gauge;
+import de.intevation.flys.client.shared.model.GaugeImpl;
+
+
+/**
+ * @author <a href="mailto:ingo.weinzierl@intevation.de">Ingo Weinzierl</a>
+ */
+public class GaugeInfoServiceImpl
+extends      RemoteServiceServlet
+implements   GaugeInfoService
+{
+    private static final Logger logger =
+        Logger.getLogger(GaugeInfoServiceImpl.class);
+
+
+    public static final String ERROR_NO_GAUGES_FOUND =
+        "error_no_gaugeinfo_found";
+
+    public static final String XPATH_GAUGES = "art:service/art:gauge";
+
+
+    public List<Gauge> getGaugeInfo(String rivername, String refnumber)
+    throws ServerException
+    {
+        logger.info("GaugeInfoServiceImpl.getGaugeInfo");
+
+        String url = getServletContext().getInitParameter("server-url");
+
+        Document doc = XMLUtils.newDocument();
+
+        XMLUtils.ElementCreator ec = new XMLUtils.ElementCreator(
+            doc,
+            ArtifactNamespaceContext.NAMESPACE_URI,
+            ArtifactNamespaceContext.NAMESPACE_PREFIX);
+
+        Element river = ec.create("river");
+        ec.addAttr(river, "name", rivername);
+
+        if (refnumber != null && refnumber.length() > 0) {
+            Element filter = ec.create("filter");
+            Element gauge  = ec.create("gauge");
+            gauge.setTextContent(refnumber);
+
+            filter.appendChild(gauge);
+            river.appendChild(filter);
+        }
+
+        doc.appendChild(river);
+
+        HttpClient client = new HttpClientImpl(url);
+
+        try {
+            Document result = client.callService(url, "gaugeinfo", doc);
+
+            logger.debug("Extract gauge info now.");
+            List<Gauge> gauges = extractGauges(result);
+
+            if (gauges != null && gauges.size() > 0) {
+                return gauges;
+            }
+        }
+        catch (ConnectionException ce) {
+            logger.error(ce, ce);
+        }
+
+        throw new ServerException(ERROR_NO_GAUGES_FOUND);
+    }
+
+
+    /**
+     * Extracts all wq info objects from <i>result</i> document.
+     *
+     * @param result The document retrieved by the server.
+     *
+     * @return a list of WQInfoObjects.
+     */
+    protected List<Gauge> extractGauges(Document result)
+    throws    ServerException
+    {
+        List<Gauge> gauges = new ArrayList<Gauge>();
+
+        NodeList list = (NodeList) XMLUtils.xpath(
+            result,
+            XPATH_GAUGES,
+            XPathConstants.NODESET,
+            ArtifactNamespaceContext.INSTANCE);
+
+        if (list == null || list.getLength() == 0) {
+            logger.warn("No gauges found.");
+
+            throw new ServerException(ERROR_NO_GAUGES_FOUND);
+        }
+
+        int num = list.getLength();
+        logger.debug("Response contains " + num + " objects.");
+
+        for (int i = 0; i < num; i++) {
+            Gauge obj = buildGauge((Element) list.item(i));
+
+            if (obj != null) {
+                gauges.add(obj);
+            }
+        }
+
+        logger.debug("Retrieved " + gauges.size() + " gauges.");
+
+        return gauges;
+    }
+
+
+    protected Gauge buildGauge(Element ele) {
+        String name     = ele.getAttribute("name");
+        String lowerStr = ele.getAttribute("lower");
+        String upperStr = ele.getAttribute("upper");
+
+        if (lowerStr != null && upperStr != null) {
+            try {
+                return new GaugeImpl(
+                    name,
+                    Double.valueOf(lowerStr),
+                    Double.valueOf(upperStr));
+            }
+            catch (NumberFormatException nfe) {
+                logger.warn("Error while Gauge creation: " + nfe.getMessage());
+            }
+        }
+
+        return null;
+    }
+}
+// vim:set ts=4 sw=4 si et sta sts=4 fenc=utf8 :
diff -r ca40a5b1bb04 -r 52a98e1653c1 flys-client/src/main/webapp/WEB-INF/web.xml
--- a/flys-client/src/main/webapp/WEB-INF/web.xml	Tue Mar 20 12:55:27 2012 +0000
+++ b/flys-client/src/main/webapp/WEB-INF/web.xml	Tue Mar 20 12:57:03 2012 +0000
@@ -204,6 +204,16 @@
   </servlet-mapping>
 
   <servlet>
+    <servlet-name>gaugeinfo</servlet-name>
+    <servlet-class>de.intevation.flys.client.server.GaugeInfoServiceImpl</servlet-class>
+  </servlet>
+  
+  <servlet-mapping>
+    <servlet-name>gaugeinfo</servlet-name>
+    <url-pattern>/flys/gaugeinfo</url-pattern>
+  </servlet-mapping>
+
+  <servlet>
     <servlet-name>csv</servlet-name>
     <servlet-class>de.intevation.flys.client.server.CSVExportServiceImpl</servlet-class>
   </servlet>