/**************************************************************************************
* 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.service;
import com.espertech.esper.epl.expression.ExprEvaluator;
/**
* All aggregation services require evaluation nodes which supply the value to be aggregated (summed, averaged, etc.)
* and aggregation state factories to make new aggregation states.
*/
public abstract class AggregationServiceBase implements AggregationService
{
/**
* Evaluation nodes under.
*/
protected ExprEvaluator evaluators[];
/**
* Ctor.
* @param evaluators - are the child node of each aggregation function used for computing the value to be aggregated
*/
public AggregationServiceBase(ExprEvaluator evaluators[])
{
this.evaluators = evaluators;
}
public ExprEvaluator[] getEvaluators() {
return evaluators;
}
}