--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/flys-artifacts/src/main/java/org/dive4elements/river/artifacts/states/LocationDistanceSelect.java	Thu Apr 25 12:06:39 2013 +0200
@@ -0,0 +1,152 @@
+package org.dive4elements.river.artifacts.states;
+
+import org.apache.log4j.Logger;
+
+import gnu.trove.TDoubleArrayList;
+
+import org.dive4elements.artifacts.Artifact;
+
+import org.dive4elements.artifactdatabase.data.StateData;
+
+import org.dive4elements.river.artifacts.FLYSArtifact;
+import org.dive4elements.river.artifacts.WINFOArtifact;
+
+
+/**
+ * @author <a href="mailto:ingo.weinzierl@intevation.de">Ingo Weinzierl</a>
+ */
+public class LocationDistanceSelect
+extends      ComputationRangeState
+{
+
+    /** The logger used in this class. */
+    private static Logger logger = Logger.getLogger(LocationDistanceSelect.class);
+
+    /** The name of the 'mode' field. */
+    public static final String MODE = "ld_mode";
+
+    /** The name of the 'locations' field. */
+    public static final String LOCATIONS = "ld_locations";
+
+
+    /**
+     * The default constructor that initializes an empty State object.
+     */
+    public LocationDistanceSelect() {
+    }
+
+
+    @Override
+    protected String getUIProvider() {
+        return "location_distance_panel";
+    }
+
+
+    /** Validates the range (or location). */
+    @Override
+    public boolean validate(Artifact artifact)
+    throws IllegalArgumentException
+    {
+        logger.debug("LocationDistanceSelect.validate");
+
+        FLYSArtifact flys = (FLYSArtifact)artifact;
+        StateData mode = getData(flys, MODE);
+        String mValue = mode != null ? (String)mode.getValue() : null;
+        if (mValue != null) {
+            if (mValue.equals("distance")) {
+                return super.validate(flys);
+            }
+            else {
+                return validateLocations(flys);
+            }
+        }
+        return false;
+    }
+
+
+    /** Validate selected locations. */
+    protected boolean validateLocations(FLYSArtifact flys)
+    throws    IllegalArgumentException
+    {
+        StateData dValues = getData(flys, LOCATIONS);
+        String    values  = dValues != null ? (String)dValues.getValue() : null;
+
+        if (values == null || values.length() == 0) {
+            throw new IllegalArgumentException("error_empty_state");
+        }
+
+        double[] absMinMax = getMinMax(flys);
+        double[] relMinMax = getMinMaxFromString(values);
+
+        if (relMinMax[0] < absMinMax[0] || relMinMax[0] > absMinMax[1]) {
+            throw new IllegalArgumentException("error_feed_from_out_of_range");
+        }
+
+        if (relMinMax[1] > absMinMax[1] || relMinMax[1] < absMinMax[0]) {
+            throw new IllegalArgumentException("error_feed_to_out_of_range");
+        }
+
+        return true;
+    }
+
+
+    /**
+     * Extracts the min/max values from String <i>s</i>. An
+     * IllegalArgumentException is thrown if there is a value that throws a
+     * NumberFormatException.
+     *
+     * @param s String that contains whitespace separated double values.
+     *
+     * @return a 2dmin array [min,max].
+     */
+    public static double[] getMinMaxFromString(String s)
+    throws IllegalArgumentException
+    {
+        String[] values = s.split(" ");
+
+        double[] minmax = new double[] {
+            Double.MAX_VALUE,
+            -Double.MAX_VALUE };
+
+        for (String v: values) {
+            try {
+                double value = Double.valueOf(v);
+
+                minmax[0] = minmax[0] < value ? minmax[0] : value;
+                minmax[1] = minmax[1] > value ? minmax[1] : value;
+            }
+            catch (NumberFormatException nfe) {
+                throw new IllegalArgumentException(
+                    "error_invalid_double_value");
+            }
+        }
+
+        return minmax;
+    }
+
+
+    public static double[] getLocations(WINFOArtifact flys) {
+        StateData data  = flys.getData(LOCATIONS);
+        String    value = data != null ? (String) data.getValue() : null;
+
+        if (value == null || value.length() == 0) {
+            logger.warn("No location data given.");
+            return null;
+        }
+
+        String[]         splitted = value.split(" ");
+        TDoubleArrayList values   = new TDoubleArrayList();
+
+        for (String split: splitted) {
+            try {
+                values.add(Double.valueOf(split));
+            }
+            catch (NumberFormatException nfe) {
+                logger.warn(nfe, nfe);
+            }
+        }
+
+        return values.toNativeArray();
+    }
+}
+// vim:set ts=4 sw=4 si et sta sts=4 fenc=utf-8 :