/*
***************************************************************************************
* Copyright (C) 2006 EsperTech, Inc. All rights reserved. *
* http://www.espertech.com/esper *
* 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;
}
if (numDataPoints <= 1) {
clear();
} else {
numDataPoints--;
sum = sum.subtract((BigInteger) object);
}
}
public Object getValue() {
if (numDataPoints == 0) {
return null;
}
return sum;
}
}