--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/artifacts/src/main/java/org/dive4elements/river/artifacts/states/RangeState.java	Thu Apr 25 15:23:37 2013 +0200
@@ -0,0 +1,95 @@
+package org.dive4elements.river.artifacts.states;
+
+import org.dive4elements.artifacts.Artifact;
+
+import org.dive4elements.river.artifacts.FLYSArtifact;
+
+import org.dive4elements.river.artifacts.access.RangeAccess;
+
+import org.apache.log4j.Logger;
+
+
+/**
+ * State in which km range is set.
+ * @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 Logger logger = Logger.getLogger(RangeState.class);
+
+
+    public RangeState() {
+    }
+
+    protected abstract double[] getMinMax(Artifact artifact);
+
+
+    protected boolean validateBounds(
+        double fromValid, double toValid,
+        double from,      double to)
+    throws IllegalArgumentException
+    {
+        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");
+        }
+
+        return true;
+    }
+
+
+    /**
+     * 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");
+
+        // XXX The step width is not validated at the moment!
+        return validateBounds(fromValid, toValid, from, to);
+    }
+
+
+    @Override
+    public boolean validate(Artifact artifact)
+    throws IllegalArgumentException
+    {
+        FLYSArtifact flys = (FLYSArtifact) artifact;
+
+        try {
+            RangeAccess rangeAccess = new RangeAccess(flys, null);
+            double from = rangeAccess.getFrom();
+            double to   = rangeAccess.getTo();
+            double step = rangeAccess.getStep();
+
+            double[] minmax = getMinMax(flys);
+
+            return validateBounds(minmax[0], minmax[1], from, to, step);
+        }
+        catch (NumberFormatException nfe) {
+            throw new IllegalArgumentException("error_invalid_double_value");
+        }
+        catch (NullPointerException npe) {
+            throw new IllegalArgumentException("error_empty_state");
+        }
+    }
+}
+// vim:set ts=4 sw=4 si et sta sts=4 fenc=utf-8 :