--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/artifacts/src/main/java/org/dive4elements/river/exports/injector/ComputedDischargeInjector.java	Wed Sep 10 10:01:11 2014 +0200
@@ -0,0 +1,34 @@
+package org.dive4elements.river.exports.injector;
+
+import org.apache.log4j.Logger;
+import org.dive4elements.artifacts.Artifact;
+import org.dive4elements.artifacts.CallContext;
+import org.dive4elements.artifacts.ContextInjector;
+import org.dive4elements.river.artifacts.D4EArtifact;
+import org.dive4elements.river.artifacts.access.RangeAccess;
+import org.w3c.dom.Document;
+import org.w3c.dom.Element;
+
+import static org.dive4elements.river.exports.injector.InjectorConstants.CURRENT_KM;
+
+public class ComputedDischargeInjector
+implements ContextInjector
+{
+
+    private static Logger log = Logger.getLogger(ComputedDischargeInjector.class);
+
+    @Override
+    public void setup(Element cfg) {
+    }
+
+    @Override
+    public void injectContext(
+        CallContext ctx,
+        Artifact artifact,
+        Document doc
+    ) {
+        RangeAccess access = new RangeAccess((D4EArtifact)artifact);
+        double km = access.getFrom();
+        ctx.putContextValue(CURRENT_KM, km);
+    }
+}