--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/flys-artifacts/src/main/java/org/dive4elements/river/artifacts/services/DischargeInfoService.java	Thu Apr 25 12:06:39 2013 +0200
@@ -0,0 +1,122 @@
+package org.dive4elements.river.artifacts.services;
+
+import java.util.Collections;
+import java.util.List;
+import java.util.Date;
+
+import org.apache.log4j.Logger;
+
+import org.w3c.dom.Document;
+import org.w3c.dom.Element;
+
+import org.dive4elements.artifacts.CallMeta;
+import org.dive4elements.artifacts.GlobalContext;
+
+import org.dive4elements.artifacts.common.ArtifactNamespaceContext;
+import org.dive4elements.artifacts.common.utils.XMLUtils;
+
+import org.dive4elements.river.artifacts.model.DischargeTables;
+import org.dive4elements.river.model.Gauge;
+import org.dive4elements.river.model.DischargeTable;
+import org.dive4elements.river.model.TimeInterval;
+
+/**
+ * This service provides information about discharges at a defined gauge.
+ *
+ * @author <a href="mailto:raimund.renkert@intevation.de">Raimund Renkert</a>
+ */
+public class DischargeInfoService extends FLYSService {
+
+    /** The logger used in this service. */
+    private static Logger logger = Logger.getLogger(DischargeInfoService.class);
+
+    public static final String GAUGE_XPATH = "/art:gauge/text()";
+
+    public DischargeInfoService() {
+    }
+
+
+    @Override
+    public Document doProcess(
+        Document      data,
+        GlobalContext globalContext,
+        CallMeta      callMeta
+    ) {
+        logger.debug("DischargeInfoService.process");
+        logger.debug(XMLUtils.toString(data));
+
+        String gaugeNumber = XMLUtils.xpathString(
+            data, GAUGE_XPATH, ArtifactNamespaceContext.INSTANCE);
+
+        if(gaugeNumber == null ||
+           (gaugeNumber = gaugeNumber.trim()).length() == 0) {
+            logger.warn("No gauge specified. Cannot return discharge info.");
+            return XMLUtils.newDocument();
+        }
+
+        logger.debug("Getting discharge for gauge: " + gaugeNumber);
+
+        long gn;
+        try {
+            gn = Long.parseLong(gaugeNumber);
+        }
+        catch (NumberFormatException nfe) {
+            logger.warn("Invalid gauge number. Cannot return discharg info.");
+            return XMLUtils.newDocument();
+        }
+
+        Gauge gauge = Gauge.getGaugeByOfficialNumber(gn);
+
+        logger.debug("Found gauge: " + gauge.getName());
+
+        return buildDocument(gauge);
+    }
+
+
+    protected Document buildDocument(Gauge gauge) {
+        Document result = XMLUtils.newDocument();
+
+        List<DischargeTable> tables =gauge.getDischargeTables();
+        Collections.sort(tables);
+
+        Element all = result.createElement("discharges");
+        for (DischargeTable dt: tables) {
+            Element discharge = result.createElement("discharge");
+            discharge.setAttribute("description", dt.getDescription());
+
+            // Get time interval.
+            TimeInterval ti = dt.getTimeInterval();
+
+            if (ti == null) {
+                logger.warn("DischargeTable has no TimeInterval set!");
+                continue;
+            }
+
+            Date startTime = ti.getStartTime();
+            Date stopTime = ti.getStopTime();
+
+            if (startTime != null) {
+                discharge.setAttribute("start", String.valueOf(startTime.getTime()));
+            }
+            else {
+                continue;
+            }
+
+            if (stopTime != null && dt.getKind() != DischargeTables.MASTER) {
+                discharge.setAttribute("end", String.valueOf(stopTime.getTime()));
+            }
+            else if (dt.getKind() == DischargeTables.MASTER) {
+                long now = System.currentTimeMillis();
+                discharge.setAttribute("end", String.valueOf(now));
+            }
+            else {
+                continue;
+            }
+
+            all.appendChild(discharge);
+        }
+        result.appendChild(all);
+        return result;
+    }
+}
+// vim:set ts=4 sw=4 si et sta sts=4 fenc=utf8 :