--- a/flys-artifacts/ChangeLog	Tue Jan 17 07:55:12 2012 +0000
+++ b/flys-artifacts/ChangeLog	Tue Jan 17 08:01:22 2012 +0000
@@ -1,3 +1,19 @@
+2012-01-17	Felix Wolfsteller	<felix.wolfsteller@intevation.de>
+
+	Refactoring.
+
+	* src/main/java/de/intevation/flys/artifacts/model/BlackboardDataFacet.java:
+	  Added new constructor.
+
+	* src/main/java/de/intevation/flys/artifacts/model/DataFacet.java:
+	  Refactored, subclass BlackboardDataFacet.
+
+	* src/main/java/de/intevation/flys/artifacts/model/WaterlevelFacet.java:
+	  Refactored, subclass DataFacet.
+
+	* src/main/java/de/intevation/flys/artifacts/math/DifferenceCurveFacet.java:
+	  Adjusted.
+
 2012-01-17	Felix Wolfsteller	<felix.wolfsteller@intevation.de>
 
 	* src/main/java/de/intevation/flys/artifacts/model/DataFacet.java:

--- a/flys-artifacts/src/main/java/de/intevation/flys/artifacts/math/DifferenceCurveFacet.java	Tue Jan 17 07:55:12 2012 +0000
+++ b/flys-artifacts/src/main/java/de/intevation/flys/artifacts/math/DifferenceCurveFacet.java	Tue Jan 17 08:01:22 2012 +0000
@@ -14,6 +14,7 @@
 
 /**
  * Facet with the curve of a subtraction of two waterlevel-lines.
+ * TODO inherit directly from DataFacet? Check whether this Facet is obsolete.
  */
 public class DifferenceCurveFacet extends WaterlevelFacet {
 
@@ -44,7 +45,7 @@
         WINFOArtifact winfo = (WINFOArtifact)artifact;
 
         CalculationResult res = (CalculationResult)
-            winfo.compute(context, hash, stateID, type, false);
+            winfo.compute(context, hash, stateId, type, false);
 
         WKms [] wkms = (WKms [])res.getData();
 
@@ -62,7 +63,7 @@
         WaterlevelFacet copy = new DifferenceCurveFacet();
         copy.set(this);
         copy.type    = type;
-        copy.stateID = stateID;
+        copy.stateId = stateId;
         copy.hash    = hash;
         return copy;
     }

--- a/flys-artifacts/src/main/java/de/intevation/flys/artifacts/model/BlackboardDataFacet.java	Tue Jan 17 07:55:12 2012 +0000
+++ b/flys-artifacts/src/main/java/de/intevation/flys/artifacts/model/BlackboardDataFacet.java	Tue Jan 17 08:01:22 2012 +0000
@@ -22,6 +22,10 @@
         super(idx, name, description);
     }
 
+    /** Do not instantiate a BlackboardDataFacet, subclass it instead. */
+    public BlackboardDataFacet(String name, String description) {
+        super(0, name, description);
+    }
 
     /** Define key to which to respond when asked for 'blackboard'
      * (DataProvider)- data. */

--- a/flys-artifacts/src/main/java/de/intevation/flys/artifacts/model/DataFacet.java	Tue Jan 17 07:55:12 2012 +0000
+++ b/flys-artifacts/src/main/java/de/intevation/flys/artifacts/model/DataFacet.java	Tue Jan 17 08:01:22 2012 +0000
@@ -11,7 +11,7 @@
 import de.intevation.flys.artifacts.states.DefaultState.ComputeType;
 
 public class DataFacet
-extends      DefaultFacet
+extends      BlackboardDataFacet
 {
     protected ComputeType type;
     protected String      hash;

--- a/flys-artifacts/src/main/java/de/intevation/flys/artifacts/model/WaterlevelFacet.java	Tue Jan 17 07:55:12 2012 +0000
+++ b/flys-artifacts/src/main/java/de/intevation/flys/artifacts/model/WaterlevelFacet.java	Tue Jan 17 08:01:22 2012 +0000
@@ -7,7 +7,7 @@
 
 import de.intevation.artifactdatabase.state.Facet;
 
-import de.intevation.flys.artifacts.WINFOArtifact;
+import de.intevation.flys.artifacts.FLYSArtifact;
 
 import de.intevation.flys.artifacts.states.DefaultState.ComputeType;
 
@@ -15,24 +15,14 @@
 /**
  * Facet of a Waterlevel (WQKms).
  */
-public class WaterlevelFacet extends BlackboardDataFacet {
+public class WaterlevelFacet extends DataFacet {
 
     private static Logger logger = Logger.getLogger(WaterlevelFacet.class);
 
-    protected ComputeType type;
-    protected String      stateID;
-    protected String      hash;
-
-
     public WaterlevelFacet(int index, String name, String description) {
-        this(index, name, description, ComputeType.ADVANCE, null, null);
+        super(index, name, description, ComputeType.ADVANCE, null, null);
     }
 
-
-    public WaterlevelFacet() {
-    }
-
-
     public WaterlevelFacet(
         int         index,
         String      name,
@@ -42,10 +32,10 @@
         String      hash
 
     ) {
-        super(index, name, description);
-        this.type    = type;
-        this.stateID = stateID;
-        this.hash    = hash;
+        super(index, name, description, type, stateID, hash);
+    }
+
+    public WaterlevelFacet() {
     }
 
 
@@ -56,10 +46,10 @@
     public Object getData(Artifact artifact, CallContext context) {
         logger.debug("Get data for waterlevels at index: " + index);
 
-        WINFOArtifact winfo = (WINFOArtifact)artifact;
+        FLYSArtifact winfo = (FLYSArtifact)artifact;
 
         CalculationResult res = (CalculationResult)
-            winfo.compute(context, hash, stateID, type, false);
+            winfo.compute(context, hash, stateId, type, false);
 
         WQKms [] wqkms = (WQKms [])res.getData();
 
@@ -73,7 +63,7 @@
         WaterlevelFacet copy = new WaterlevelFacet();
         copy.set(this);
         copy.type    = type;
-        copy.stateID = stateID;
+        copy.stateId = stateId;
         copy.hash    = hash;
         return copy;
     }