/**************************************************************************************
* 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;
/**
* Counts all datapoints including null values.
*/
public class AggregatorCount implements AggregationMethod
{
protected long numDataPoints;
public void clear()
{
numDataPoints = 0;
}
public void enter(Object object)
{
numDataPoints++;
}
public void leave(Object object)
{
numDataPoints--;
}
public Object getValue()
{
return numDataPoints;
}
public Class getValueType()
{
return Long.class;
}
}