--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/artifacts/src/main/java/org/dive4elements/river/utils/DateAverager.java	Thu Apr 25 15:23:37 2013 +0200
@@ -0,0 +1,36 @@
+package org.dive4elements.river.utils;
+
+import gnu.trove.TLongArrayList;
+
+import java.util.Date;
+
+public class DateAverager
+{
+   protected TLongArrayList dates;
+
+    public DateAverager() {
+        dates = new TLongArrayList();
+    }
+
+    public void add(Date date) {
+        dates.add(date.getTime());
+    }
+
+    public Date getAverage() {
+        int N = dates.size();
+        if (N == 0) {
+            return null;
+        }
+        long min = dates.min();
+        long sum = 0L;
+        for (int i = 0; i < N; ++i) {
+            sum += dates.getQuick(i) - min;
+        }
+        return new Date(min + (long)Math.round(sum/(double)N));
+    }
+
+    public void clear() {
+        dates.resetQuick();
+    }
+}
+// vim:set ts=4 sw=4 si et sta sts=4 fenc=utf8 :