--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/flys-artifacts/src/main/java/de/intevation/flys/artifacts/states/RangeState.java	Fri Sep 28 12:14:10 2012 +0200
@@ -0,0 +1,54 @@
+package de.intevation.flys.artifacts.states;
+
+import org.apache.log4j.Logger;
+
+
+/**
+ * @author <a href="mailto:ingo.weinzierl@intevation.de">Ingo Weinzierl</a>
+ */
+public abstract class RangeState extends DefaultState {
+
+    /** The logger that is used in this class.*/
+    private static Logger logger = Logger.getLogger(RangeState.class);
+
+
+    public RangeState() {
+    }
+
+
+    /**
+     * Validates a given range with a given valid range.
+     *
+     * @param fromValid Valid lower value of the range.
+     * @param toValid Valid upper value of the range.
+     * @param from The lower value.
+     * @param to The upper value.
+     * @param step The step width.
+     *
+     * @return true, if everything was fine, otherwise an exception is thrown.
+     */
+    protected boolean validateBounds(
+        double fromValid, double toValid,
+        double from,      double to,      double step)
+    throws IllegalArgumentException
+    {
+        logger.debug("RangeState.validateRange");
+
+        if (from < fromValid) {
+            logger.error(
+                "Invalid 'from'. " + from + " is smaller than " + fromValid);
+            throw new IllegalArgumentException("error_feed_from_out_of_range");
+        }
+        else if (to > toValid) {
+            logger.error(
+                "Invalid 'to'. " + to + " is bigger than " + toValid);
+            throw new IllegalArgumentException("error_feed_to_out_of_range");
+        }
+        else if (from > to) {
+            throw new IllegalArgumentException("error_feed_from_bigger_to");
+        }
+
+        return true;
+    }
+}
+// vim:set ts=4 sw=4 si et sta sts=4 fenc=utf-8 :