diff -u -r1.4 -r1.5
--- DetectorIdentifierHelper.java	11 Dec 2007 07:27:48 -0000	1.4
+++ DetectorIdentifierHelper.java	2 Jul 2008 21:28:34 -0000	1.5
@@ -39,6 +39,10 @@

  * </ul>
  * </p>
  * 

+ * <p>
+ * Every DetectorIdentifierHelper is associated with a single subdetector, such as the Hcal Barrel.
+ * </p>
+ * 

  * @author Jeremy McCormick <[log in to unmask]>
  */
 public class DetectorIdentifierHelper

@@ -134,6 +138,9 @@

     IIdentifier lumiId;
     IIdentifier lumiEndcapPositiveId;
     IIdentifier lumiEndcapNegativeId;

+    
+    private IDetectorElement subdetectorDetectorElement = null;
+    private int subdetectorSystemNumber = -1;

 
     // LDC si tracking...
     // inner = sit

@@ -292,7 +299,10 @@

     }
 
     // Public ctor.

-    public DetectorIdentifierHelper(IIdentifierDictionary dict, SystemMap systemMap)

+    public DetectorIdentifierHelper(
+    		IDetectorElement subdetectorDetectorElement, 
+    		IIdentifierDictionary dict, 
+    		SystemMap systemMap)

     {
         super(dict);
         try {

@@ -302,6 +312,12 @@

         {
             throw new RuntimeException(x);
         }

+        
+        // Make association to a subdetector's DetectorElement.
+        this.subdetectorDetectorElement = subdetectorDetectorElement;
+        
+        // Make assocation to a subdetector's system value.
+        this.subdetectorSystemNumber = this.getSystemValue(this.subdetectorDetectorElement.getIdentifier());

     }	
 
     private IIdentifier makeSubsysId(int system)

@@ -842,4 +858,19 @@

     {
         return invalidIndex;
     }

-}

+    
+    public String getSubdetectorName()
+    {
+    	return subdetectorDetectorElement.getName();
+    }
+    
+    public int getSubdetectorSystemNumber()
+    {
+    	return subdetectorSystemNumber;
+    }
+    
+    public IDetectorElement getSubdetectorDetectorElement()
+    {
+    	return subdetectorDetectorElement;
+    }
+}

\ No newline at end of file