/**************************************************************************************
* Copyright (C) 2008 EsperTech, Inc. All rights reserved. *
* http://esper.codehaus.org *
* http://www.espertech.com *
* ---------------------------------------------------------------------------------- *
* The software in this package is published under the terms of the GPL license *
* a copy of which has been included with this distribution in the license.txt file. *
**************************************************************************************/
package com.espertech.esper.epl.agg.aggregator;
import java.math.BigInteger;
/**
* Sum for BigInteger values.
*/
public class AggregatorSumBigInteger implements AggregationMethod
{
protected BigInteger sum;
protected long numDataPoints;
/**
* Ctor.
*/
public AggregatorSumBigInteger()
{
sum = BigInteger.valueOf(0);
}
public void clear()
{
sum = BigInteger.valueOf(0);
numDataPoints = 0;
}
public void enter(Object object)
{
if (object == null)
{
return;
}
numDataPoints++;
sum = sum.add((BigInteger)object);
}
public void leave(Object object)
{
if (object == null)
{
return;
}
numDataPoints--;
sum = sum.subtract((BigInteger)object);
}
public Object getValue()
{
if (numDataPoints == 0)
{
return null;
}
return sum;
}
public Class getValueType()
{
return BigInteger.class;
}
}