--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/artifacts/src/main/java/org/dive4elements/river/artifacts/model/fixings/DateUniqueMaker.java	Wed Aug 21 01:09:25 2013 +0200
@@ -0,0 +1,41 @@
+package org.dive4elements.river.artifacts.model.fixings;
+
+import java.util.Date;
+
+import gnu.trove.TIntObjectHashMap;
+import gnu.trove.TLongHashSet;
+
+public class DateUniqueMaker {
+
+    private TLongHashSet      times;
+    private TIntObjectHashMap already;
+
+    public DateUniqueMaker() {
+        times   = new TLongHashSet();
+        already = new TIntObjectHashMap();
+    }
+
+    public <T extends QWI> void makeUnique(T t) {
+
+        // Map same index to same new value
+        if (already.containsKey(t.index)) {
+            t.date = (Date)already.get(t.index);
+            return;
+        }
+        long time = t.date.getTime();
+        if (!times.add(time)) { // same found before
+            do {
+                time += 30L*1000L; // Add 30secs
+            }
+            while (!times.add(time));
+            Date newDate = new Date(time);
+            already.put(t.index, newDate);
+            // Write back modified time.
+            t.date = newDate;
+        }
+        else {
+            // register as seen.
+            already.put(t.index, t.date);
+        }
+    }
+}