--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/flys-artifacts/src/main/java/de/intevation/flys/jfree/XYDatasetToZeroMapper.java	Fri Sep 28 12:14:50 2012 +0200
@@ -0,0 +1,135 @@
+package de.intevation.flys.jfree;
+
+import java.util.Iterator;
+import java.util.List;
+import java.util.ArrayList;
+
+import org.jfree.data.xy.XYDataset;
+
+import org.jfree.data.general.DatasetChangeListener;
+import org.jfree.data.general.DatasetGroup;
+
+import org.jfree.data.DomainOrder;
+
+import java.io.Serializable;
+
+public class XYDatasetToZeroMapper
+implements   Serializable
+{
+    protected int seriesA;
+    protected int seriesB;
+
+    public class MappedXYDataset implements XYDataset, Serializable {
+
+        protected XYDataset parent;
+
+        public MappedXYDataset() {
+        }
+
+        public MappedXYDataset(XYDataset parent) {
+            this.parent = parent;
+        }
+
+        protected int remap(int series) {
+            switch (series) {
+                case 0: return seriesA;
+                case 1: return seriesB;
+            }
+            return series;
+        }
+
+        @Override
+        public int getSeriesCount() {
+            return seriesA != seriesB ? 2 : 1;
+        }
+
+        @Override
+        public Comparable getSeriesKey(int series) {
+            return parent.getSeriesKey(remap(series));
+        }
+
+        @Override
+        public int indexOf(Comparable seriesKey) {
+            Comparable cmpA = parent.getSeriesKey(seriesA);
+            if (cmpA == seriesKey
+            || (cmpA != null && cmpA.equals(seriesKey))) {
+                return 0;
+            }
+            Comparable cmpB = parent.getSeriesKey(seriesB);
+            if (cmpB == seriesKey
+            || (cmpB != null && cmpB.equals(seriesKey))) {
+                return 1;
+            }
+            return -1;
+        }
+
+        @Override
+        public void addChangeListener(DatasetChangeListener listener) {
+            parent.addChangeListener(listener);
+        }
+
+        @Override
+        public void removeChangeListener(DatasetChangeListener listener) {
+            parent.removeChangeListener(listener);
+        }
+
+        @Override
+        public DatasetGroup getGroup() {
+            return parent.getGroup();
+        }
+
+        @Override
+        public void setGroup(DatasetGroup group) {
+            parent.setGroup(group);
+        }
+
+        @Override
+        public DomainOrder getDomainOrder() {
+            return parent.getDomainOrder();
+        }
+
+        @Override
+        public int getItemCount(int series) {
+            return parent.getItemCount(remap(series));
+        }
+
+        @Override
+        public Number getX(int series, int item) {
+            return parent.getX(remap(series), item);
+        }
+
+        @Override
+        public double getXValue(int series, int item) {
+            return parent.getXValue(remap(series), item);
+        }
+
+        @Override
+        public Number getY(int series, int item) {
+            return parent.getY(remap(series), item);
+        }
+
+        @Override
+        public double getYValue(int series, int item) {
+            return parent.getYValue(remap(series), item);
+        }
+    } // class MappedXYDataset
+
+    public XYDatasetToZeroMapper() {
+    }
+
+    public XYDatasetToZeroMapper(int seriesA) {
+        this(seriesA, seriesA);
+    }
+
+    public XYDatasetToZeroMapper(int seriesA, int seriesB) {
+        this.seriesA = seriesA;
+        this.seriesB = seriesB;
+    }
+
+    public Iterator<XYDataset> iterator(XYDataset dataset) {
+        List<XYDataset> list = new ArrayList<XYDataset>(1);
+        list.add(new MappedXYDataset(dataset));
+        return list.iterator();
+    }
+}
+// vim:set ts=4 sw=4 si et sta sts=4 fenc=utf8 :