--- a/flys-artifacts/ChangeLog	Thu May 24 04:33:52 2012 +0000
+++ b/flys-artifacts/ChangeLog	Thu May 24 04:36:53 2012 +0000
@@ -1,4 +1,9 @@
-2012-05-23	Felix Wolfsteller	<felix.wolfsteller@intevation.de>
+2012-05-24	Felix Wolfsteller	<felix.wolfsteller@intevation.de>
+
+	* src/main/java/de/intevation/flys/artifacts/model/ReferenceCurveFacet.java:
+	  Expose data via blackboard.
+
+2012-05-24	Felix Wolfsteller	<felix.wolfsteller@intevation.de>
 
 	* doc/conf/meta-data.xml: Serve fixations
 	  with relative points for reference curves.

--- a/flys-artifacts/src/main/java/de/intevation/flys/artifacts/model/ReferenceCurveFacet.java	Thu May 24 04:33:52 2012 +0000
+++ b/flys-artifacts/src/main/java/de/intevation/flys/artifacts/model/ReferenceCurveFacet.java	Thu May 24 04:36:53 2012 +0000
@@ -1,5 +1,6 @@
 package de.intevation.flys.artifacts.model;
 
+import java.util.ArrayList;
 import java.util.List;
 import java.util.Collections;
 
@@ -9,11 +10,13 @@
 import de.intevation.artifacts.CallContext;
 
 import de.intevation.flys.artifacts.FLYSArtifact;
+import de.intevation.flys.artifacts.WINFOArtifact;
 
 import de.intevation.flys.artifacts.states.DefaultState.ComputeType;
 
 import org.apache.log4j.Logger;
 
+
 /** Facet for W-over-Ws. */
 public class ReferenceCurveFacet 
 extends      DataFacet
@@ -22,13 +25,24 @@
 
     public static final String CONTEXT_KEY = "reference.curve.axis.scale";
 
+    /** Blackboard data provider key for reference curves start km. */
+    public static final String BB_REFERENCECURVE_STARTKM =
+        "reference_curve.startkm";
+
+    /** Blackboard data provider key for reference curves end kms. */
+    public static final String BB_REFERENCECURVE_ENDKMS =
+        "reference_curve.endkms";
+
+
     public ReferenceCurveFacet() {
     }
 
+
     public ReferenceCurveFacet(int index, String name, String description) {
         super(index, name, description, ComputeType.ADVANCE, null, null);
     }
 
+
     public ReferenceCurveFacet(
         int         index,
         String      name,
@@ -40,6 +54,7 @@
         super(index, name, description, type, hash, stateID);
     }
 
+
     public Object getData(Artifact artifact, CallContext context) {
 
         if (log.isDebugEnabled()) {
@@ -50,6 +65,33 @@
         return getWWQQ(artifact, context);
     }
 
+
+   /**
+     * Can provide parameters of reference curve
+     * @param key      will respond on BB_REFERENCECURVE START/ENDKMS
+     * @param param    ignored
+     * @param context  ignored
+     * @return whatever parameters for reference curve
+     */
+    @Override
+    public Object provideBlackboardData(Artifact artifact,
+        Object key,
+        Object param,
+        CallContext context
+    ) {
+        WINFOArtifact winfo = (WINFOArtifact) artifact;
+        if (key.equals(BB_REFERENCECURVE_STARTKM)) {
+            return winfo.getReferenceStartKm();
+        }
+        else if (key.equals(BB_REFERENCECURVE_ENDKMS)) {
+            return winfo.getReferenceEndKms();
+        }
+        else {
+            return null;
+        }
+    }
+
+
     protected WWQQ getWWQQ(Artifact artifact, CallContext context) {
         FLYSArtifact winfo = (FLYSArtifact)artifact;
 
@@ -59,6 +101,7 @@
         return ((WWQQ [])res.getData())[index];
     }
 
+
     @Override
     public void set(Facet other) {
         super.set(other);
@@ -68,6 +111,7 @@
         stateId               = o.stateId;
     }
 
+
     /** Copy deeply. */
     @Override
     public Facet deepCopy() {
@@ -76,6 +120,16 @@
         return copy;
     }
 
+
+    @Override
+    public List getStaticDataProviderKeys(Artifact art) {
+        List list = new ArrayList();
+        list.add(BB_REFERENCECURVE_STARTKM);
+        list.add(BB_REFERENCECURVE_ENDKMS);
+        return list;
+    }
+
+
     @Override
     public List getDataProviderKeys(Artifact art, CallContext context) {
 
@@ -90,7 +144,7 @@
             ((WWAxisTypes)obj).classify(getWWQQ(art, context));
         }
 
-        return Collections.emptyList();
+        return getStaticDataProviderKeys(art);//Collections.emptyList();
     }
 }
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