--- a/artifacts/src/main/java/org/dive4elements/river/utils/RiverUtils.java	Tue Sep 24 18:35:21 2013 +0200
+++ b/artifacts/src/main/java/org/dive4elements/river/utils/RiverUtils.java	Tue Sep 24 18:36:43 2013 +0200
@@ -10,6 +10,7 @@
 
 import org.dive4elements.artifactdatabase.state.State;
 import org.dive4elements.artifacts.Artifact;
+import org.dive4elements.artifacts.ArtifactNamespaceContext;
 import org.dive4elements.artifacts.CallContext;
 import org.dive4elements.artifacts.common.utils.Config;
 import org.dive4elements.artifacts.common.utils.XMLUtils;
@@ -101,6 +102,11 @@
     public static final String XPATH_FLOODMAP_MAPSERVER_TEMPLATE_PATH =
         "/artifact-database/floodmap/mapserver/templates/@path";
 
+    public static final String CURRENT_KM = "currentKm";
+
+    public static final String XPATH_CHART_CURRENTKM =
+        "/art:action/art:attributes/art:currentKm/@art:km";
+
 
     private RiverUtils() {
     }
@@ -917,5 +923,31 @@
         else if (q >= 1000d) q = Math.rint(q);
         return q;
     }
+
+    /** Parses the request and checks if it contains a currentKM setting.
+     * If this is the case the currentKM is added to the context.*/
+    public static void setKMFromRequestInContext(Document request,
+            CallContext context) {
+        Double dKm;
+        String km = XMLUtils.xpathString(
+            request,
+            XPATH_CHART_CURRENTKM,
+            ArtifactNamespaceContext.INSTANCE);
+
+        if (km == null) {
+            return;
+        }
+
+        try {
+            dKm = Double.valueOf(km);
+        } catch (NumberFormatException nfe) {
+            return;
+        }
+
+        if (logger.isDebugEnabled()) {
+            logger.debug("currentKm = " + dKm);
+        }
+        context.putContextValue(CURRENT_KM, dKm);
+    }
 }
 // vim:set ts=4 sw=4 si et sta sts=4 fenc=utf8 :