diff -u -r1.4 -r1.5
--- SiSensor.java	8 May 2007 06:41:53 -0000	1.4
+++ SiSensor.java	8 May 2007 23:39:47 -0000	1.5
@@ -9,20 +9,22 @@

  * Open. You can then make changes to the template in the Source Editor.
  */
 

-import org.lcsim.detector.IDetectorElement;
-import org.lcsim.detector.DetectorElement;
-import org.lcsim.detector.IPhysicalVolumePath;
-import org.lcsim.detector.solids.Box;
-import org.lcsim.detector.Rotation3D;
-import org.lcsim.detector.converter.compact.DeDetector;
-//import static org.lcsim.units.clhep.SystemOfUnits.*;
-//import static org.lcsim.units.clhep.PhysicalConstants.*;        
-
-import hep.physics.vec.Hep3Vector;

 import hep.physics.vec.BasicHep3Vector;

+import hep.physics.vec.Hep3Vector;

 import hep.physics.vec.VecOp;
 

-import java.util.*;

+import java.util.ArrayList;
+import java.util.EnumMap;
+import java.util.List;
+import java.util.Map;
+
+import org.lcsim.detector.DetectorElement;
+import org.lcsim.detector.IDetectorElement;
+import org.lcsim.detector.Rotation3D;
+import org.lcsim.detector.converter.compact.DeDetector;
+import org.lcsim.detector.converter.compact.DeSubdetector;
+import org.lcsim.detector.identifier.IIdentifierHelper;
+import org.lcsim.detector.solids.Box;

 
 /**
  *

@@ -493,6 +495,16 @@

                 "   Property 1";
         return output;
     }

+    
+    public IIdentifierHelper getIdentifierHelper()
+    {
+        List<DeSubdetector> subdet = findAncestors(DeSubdetector.class);        
+        if ( subdet.size() == 0 )
+        {
+            throw new RuntimeException("Can't find DeSubdetector for SiSensor!");
+        }
+        return subdet.get(0).getIdentifierHelper();
+    }