diff -N IDHitMapDriver.java
--- /dev/null	1 Jan 1970 00:00:00 -0000
+++ IDHitMapDriver.java	12 Aug 2009 18:30:59 -0000	1.1
@@ -0,0 +1,54 @@

+package org.lcsim.contrib.SteveMagill;
+
+import java.util.*;
+import org.lcsim.event.*;
+import org.lcsim.event.CalorimeterHit;
+import org.lcsim.util.Driver;
+import org.lcsim.recon.cluster.util.*;
+import org.lcsim.util.aida.AIDA;
+import hep.aida.ITree;
+
+public class IDHitMapDriver extends Driver
+{
+    private AIDA aida = AIDA.defaultInstance();
+    private String[] _inhitnames;
+    private String _omapname;
+      
+    public IDHitMapDriver()
+    {
+
+    }
+   
+    protected void process(EventHeader event)
+    {
+        super.process(event);  // executes all added drivers
+        
+        //  create map linking cellID to CalHit
+        Map<Long, CalorimeterHit> omap = new HashMap<Long, CalorimeterHit>();
+
+        for (int i=0; i<_inhitnames.length; i++)
+        {
+            List<CalorimeterHit> schits = event.get(CalorimeterHit.class,_inhitnames[i]);
+            for (CalorimeterHit schit : schits)
+            {
+                long cid = schit.getCellID();
+                omap.put(cid, schit);
+            }
+        }
+
+        event.put(_omapname,omap);
+
+    }  // end of event loop
+        
+    public void setInHitnames(String[] inhitnames)
+    {
+        _inhitnames = inhitnames;
+    }
+
+    public void setOutMapname(String omapname)
+    {
+        _omapname = omapname;
+    }
+        
+}
+