/*
***************************************************************************************
* 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.factory;
import com.espertech.esper.epl.agg.access.*;
import com.espertech.esper.epl.agg.service.AggregationStateFactory;
import com.espertech.esper.epl.expression.accessagg.ExprAggMultiFunctionLinearAccessNode;
import com.espertech.esper.epl.expression.core.ExprEvaluator;
import com.espertech.esper.epl.expression.core.ExprNode;
public class AggregationStateFactoryLinear implements AggregationStateFactory {
protected final ExprAggMultiFunctionLinearAccessNode expr;
protected final int streamNum;
protected final ExprEvaluator optionalFilter;
public AggregationStateFactoryLinear(ExprAggMultiFunctionLinearAccessNode expr, int streamNum, ExprEvaluator optionalFilter) {
this.expr = expr;
this.streamNum = streamNum;
this.optionalFilter = optionalFilter;
}
public AggregationState createAccess(int agentInstanceId, boolean join, Object groupKey, AggregationServicePassThru passThru) {
if (join) {
if (optionalFilter != null) {
return new AggregationStateLinearJoinWFilter(streamNum, optionalFilter);
}
return new AggregationStateLinearJoinImpl(streamNum);
}
if (optionalFilter != null) {
return new AggregationStateLinearWFilter(streamNum, optionalFilter);
}
return new AggregationStateLinearImpl(streamNum);
}
public ExprNode getAggregationExpression() {
return expr;
}
}