diff -N DefaultClusterPropertyCalculator.java
--- /dev/null	1 Jan 1970 00:00:00 -0000
+++ DefaultClusterPropertyCalculator.java	30 Jun 2005 20:53:49 -0000	1.1
@@ -0,0 +1,83 @@

+package org.lcsim.recon.cluster.util;
+
+import java.util.ArrayList;
+import java.util.Collections;
+import java.util.List;
+import org.lcsim.event.CalorimeterHit;
+import org.lcsim.event.Cluster;
+
+/**
+ * Default implementation of ClusterPropertyCalculator Interface 
+ * 
+ * @author cassell
+ */
+public class DefaultClusterPropertyCalculator implements ClusterPropertyCalculator
+{
+	protected double[] position;
+	protected double[] positionError;
+	protected double iphi;
+	protected double itheta;
+	protected double[] directionError;
+	protected double[] shapeParameters;
+
+	/** 
+	 * Calculate the cluster properties from the hits
+	 */
+	public DefaultClusterPropertyCalculator()
+	{
+		position = new double[3];
+		positionError = new double[6];
+		iphi = 0.;
+		itheta = 0.;
+		directionError = new double[6];
+		shapeParameters = new double[6];
+	}
+	public void calculateProperties(List<CalorimeterHit> hits)
+	{
+		double[] sums = {0.,0.,0.};
+		double wtsum = 0.;
+		for(int i=0;i<hits.size();i++)
+		{
+			CalorimeterHit hit = hits.get(i);
+			double[] pos = hit.getPosition();
+			double wt = hit.getEnergy();
+			wtsum += wt;
+			for(int j=0;j<3;j++)
+			{
+				sums[j] += wt*pos[j];
+			}
+		}
+		if(wtsum > 0.)
+		{
+			for(int j=0;j<3;j++)
+			{
+				position[j] = sums[j]/wtsum;
+			}
+		}
+	}
+	public double[] getPosition()
+	{
+		return position;
+	}
+	public double[] getPositionError()
+	{
+		return positionError;
+	}
+	public double getIPhi()
+	{
+		return iphi;
+	}
+	public double getITheta()
+	{
+		return itheta;
+	}
+	public double[] getDirectionError()
+	{
+		return directionError;
+	}
+	public double[] getShapeParameters()
+	{
+		return shapeParameters;
+	}
+		
+}