/*
* *************************************************************************************
* 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.core.context.stmt;
import com.espertech.esper.client.EventBean;
import com.espertech.esper.epl.expression.ExprEvaluatorContext;
import com.espertech.esper.epl.expression.ExprSubselectStrategy;
import java.util.Collection;
public class AIRegistrySubselectSingle implements AIRegistrySubselect, ExprSubselectStrategy {
private ExprSubselectStrategy strategy;
public AIRegistrySubselectSingle() {
}
public void assignService(int num, ExprSubselectStrategy subselectStrategy) {
this.strategy = subselectStrategy;
}
public void deassignService(int num) {
this.strategy = null;
}
public Collection<EventBean> evaluateMatching(EventBean[] eventsPerStream, ExprEvaluatorContext exprEvaluatorContext) {
return strategy.evaluateMatching(eventsPerStream, exprEvaluatorContext);
}
public int getAgentInstanceCount() {
return strategy == null ? 0 : 1;
}
}