diff -N MCPClassifier.java
--- /dev/null	1 Jan 1970 00:00:00 -0000
+++ MCPClassifier.java	5 Aug 2005 21:55:25 -0000	1.1
@@ -0,0 +1,55 @@

+package org.lcsim.event.util;
+
+import java.util.ArrayList;
+import java.util.HashMap;
+import java.util.List;
+import java.util.Map;
+import org.lcsim.event.MCParticle;
+
+
+/**
+ * MCPClassifier has a single method getClassification(MCParticle) which
+ * returns a string classifying the MCParticle parameter. String values
+ * are:
+ * GeneratorInt -> Generator particle the simulator never saw
+ * GeneratorPre -> Generator particle passed to the simulator along with a
+ *                 predecay, and the simulator generated the decay products.
+ * GeneratorFS  -> Generator final state particle: either FinalState in the
+ *                 input file, or intermediate passed to the Simulator with a
+ *                 predecay that never happened.
+ * Backscatter  -> Simulator particle produced as a result of backscatter from
+ *                 a non-tracking region.
+ * VNEOP        -> Simulator particle produced without destroying parent.
+ * IntOrDecay   -> Simulator particle produced as a result of an interaction or
+ *                 decay in a tracking region.
+ *
+ */
+
+public class MCPClassifier
+{
+    
+    public String getClassification(MCParticle p)
+    {
+		if(p.getGeneratorStatus() > 0)
+		{
+			boolean hasGeneratorDaughters = false;
+			List<MCParticle> daughters = p.getDaughters();
+			for(MCParticle d : daughters)
+			{
+				if(d.getGeneratorStatus() > 0)hasGeneratorDaughters = true;
+			}
+			if(!hasGeneratorDaughters)return "GeneratorFS";
+			if(p.getSimulatorStatus().isDecayedInTracker() |
+			   p.getSimulatorStatus().isDecayedInCalorimeter())return "GeneratorPre";
+			return "GeneratorInt";
+		}
+		else
+		{
+			if(p.getSimulatorStatus().isBackscatter())return "Backscatter";
+			if(p.getSimulatorStatus().vertexIsNotEndpointOfParent())return "VNEOP";
+			return "IntOrDecay";
+		}
+
+    }
+    
+}