--- a/flys-client/src/main/java/de/intevation/flys/client/client/utils/DoubleValidator.java	Thu Jun 28 15:33:08 2012 +0000
+++ b/flys-client/src/main/java/de/intevation/flys/client/client/utils/DoubleValidator.java	Thu Jun 28 15:44:10 2012 +0000
@@ -17,6 +17,32 @@
     /** The interface that provides i18n messages. */
     protected FLYSConstants MSG = GWT.create(FLYSConstants.class);
 
+
+    /** Statically determine doubility of String value. */
+    public static boolean isDouble(Object obj) {
+        if (obj == null) {
+            return false;
+        }
+
+        boolean valid = true;
+        String v = obj.toString();
+
+        NumberFormat f = NumberFormat.getDecimalFormat();
+
+        try {
+            if (v == null) {
+                throw new NumberFormatException("empty");
+            }
+
+            double value = f.parse(v);
+        }
+        catch (NumberFormatException nfe) {
+            valid = false;
+        }
+        return valid;
+    
+    }
+
     /**
      *
      */