/*
***************************************************************************************
* 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.expression.accessagg;
import com.espertech.esper.epl.agg.access.*;
import com.espertech.esper.epl.expression.core.ExprNode;
public class ExprAggAggregationAgentFactory {
public static AggregationAgent make(int streamNum, ExprNode optionalFilter) {
if (streamNum == 0) {
if (optionalFilter == null) {
return AggregationAgentDefault.INSTANCE;
} else {
return new AggregationAgentDefaultWFilter(optionalFilter.getExprEvaluator());
}
} else {
if (optionalFilter == null) {
return new AggregationAgentRewriteStream(streamNum);
} else {
return new AggregationAgentRewriteStreamWFilter(streamNum, optionalFilter.getExprEvaluator());
}
}
}
}