/*
***************************************************************************************
* 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.subquery;
import com.espertech.esper.client.EventBean;
import com.espertech.esper.epl.agg.service.AggregationService;
import com.espertech.esper.epl.expression.core.ExprEvaluator;
import com.espertech.esper.epl.expression.core.ExprEvaluatorContext;
import com.espertech.esper.event.EventBeanUtility;
import java.util.Collection;
public class SubselectEvalStrategyNRExistsDefault implements SubselectEvalStrategyNR {
private final ExprEvaluator filterEval;
private final ExprEvaluator havingEval;
public SubselectEvalStrategyNRExistsDefault(ExprEvaluator filterEval, ExprEvaluator havingEval) {
this.filterEval = filterEval;
this.havingEval = havingEval;
}
public Object evaluate(EventBean[] eventsPerStream, boolean isNewData, Collection<EventBean> matchingEvents, ExprEvaluatorContext exprEvaluatorContext, AggregationService aggregationService) {
if (matchingEvents == null || matchingEvents.size() == 0) {
return false;
}
if (filterEval == null && havingEval == null) {
return true;
}
EventBean[] events = EventBeanUtility.allocatePerStreamShift(eventsPerStream);
if (havingEval != null) {
Boolean pass = (Boolean) havingEval.evaluate(events, true, exprEvaluatorContext);
return (pass != null) && pass;
} else if (filterEval != null) {
for (EventBean subselectEvent : matchingEvents) {
// Prepare filter expression event list
events[0] = subselectEvent;
Boolean pass = (Boolean) filterEval.evaluate(events, true, exprEvaluatorContext);
if ((pass != null) && pass) {
return true;
}
}
return false;
} else {
throw new IllegalStateException("Both filter and having clause encountered");
}
}
}