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Complex event processing and event series analysis component

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/**************************************************************************************
 * Copyright (C) 2006-2015 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;
    }

}