--- a/artifacts/src/main/java/org/dive4elements/river/artifacts/uinfo/salix/SalixZone.java	Tue Jul 10 11:24:12 2018 +0200
+++ b/artifacts/src/main/java/org/dive4elements/river/artifacts/uinfo/salix/SalixZone.java	Tue Jul 10 13:27:17 2018 +0200
@@ -105,7 +105,7 @@
         if (((upper - lower) > DELTA) && list.size() == 0)
             return true;
 
-        final TreeSet<SalixZone> treeList = new TreeSet<SalixZone>();
+        final TreeSet<SalixZone> treeList = new TreeSet<>();
         treeList.addAll(list);
         double lowerCompare = lower + DELTA;
         for (final SalixZone zone : treeList) {
@@ -151,4 +151,24 @@
         return basicCompare;
     }
 
-}
\ No newline at end of file
+    public static boolean isValidAnschlussRange(final double fromTest, final double toTest, final List<SalixZone> list, final double minKm) {
+        final SalixZone zone = new SalixZone(0, fromTest, toTest);
+        final double lower = zone.getLowerFromTo();
+        final double anschluss = getAnschluss(list, minKm);
+        final double differenceAbs = (lower - anschluss) > 0 ? (lower - anschluss) : (anschluss - lower); // no Math.abs allowed :-(
+        if (differenceAbs > DELTA) {
+            return false;
+        }
+
+        return true;
+    }
+
+    private static double getAnschluss(final List<SalixZone> list, final double minKm) {
+
+        if (list.size() > 0) {
+            return list.get(list.size() - 1).getUpperFromTo();
+        }
+        return minKm;
+    }
+
+}