--- a/flys-artifacts/src/main/java/de/intevation/flys/artifacts/states/DistanceOnlySelect.java	Thu Jan 24 15:04:01 2013 +0100
+++ b/flys-artifacts/src/main/java/de/intevation/flys/artifacts/states/DistanceOnlySelect.java	Thu Jan 24 16:09:46 2013 +0100
@@ -6,6 +6,7 @@
 
 import de.intevation.artifactdatabase.data.StateData;
 
+import de.intevation.flys.artifacts.access.RangeAccess;
 import de.intevation.flys.artifacts.FLYSArtifact;
 
 
@@ -23,21 +24,13 @@
     public boolean validate(Artifact artifact)
     throws IllegalArgumentException
     {
+        // TODO think about better hierarchy wrt RangeState#validate.
         FLYSArtifact flys = (FLYSArtifact) artifact;
 
-        StateData dFrom = getData(flys, getLowerField());
-        StateData dTo   = getData(flys, getUpperField());
-
-        String fromStr = dFrom != null ? (String) dFrom.getValue() : null;
-        String toStr   = dTo   != null ? (String) dTo.getValue()   : null;
-
-        if (fromStr == null || toStr == null) {
-            throw new IllegalArgumentException("error_empty_state");
-        }
-
         try {
-            double from = Double.parseDouble(fromStr);
-            double to   = Double.parseDouble(toStr);
+            RangeAccess rangeAccess = new RangeAccess(flys, null);
+            double from = rangeAccess.getFrom();
+            double to   = rangeAccess.getTo();
 
             double[] minmax = getMinMax(flys);
 
@@ -46,6 +39,9 @@
         catch (NumberFormatException nfe) {
             throw new IllegalArgumentException("error_invalid_double_value");
         }
+        catch (NullPointerException npe) {
+            throw new IllegalArgumentException("error_empty_state");
+        }
     }
 }
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