/*
***************************************************************************************
* 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.type.RelationalOpEnum;
import java.util.Collection;
public class SubselectEvalStrategyNRRelOpAnyDefault extends SubselectEvalStrategyNRRelOpBase {
private final ExprEvaluator filterEval;
public SubselectEvalStrategyNRRelOpAnyDefault(ExprEvaluator valueEval, ExprEvaluator selectEval, boolean resultWhenNoMatchingEvents, RelationalOpEnum.Computer computer, ExprEvaluator filterEval) {
super(valueEval, selectEval, resultWhenNoMatchingEvents, computer);
this.filterEval = filterEval;
}
protected Object evaluateInternal(Object leftResult, EventBean[] events, boolean isNewData, Collection<EventBean> matchingEvents, ExprEvaluatorContext exprEvaluatorContext, AggregationService aggregationService) {
boolean hasNonNullRow = false;
boolean hasRows = false;
for (EventBean subselectEvent : matchingEvents) {
events[0] = subselectEvent;
// Eval filter expression
if (filterEval != null) {
Boolean pass = (Boolean) filterEval.evaluate(events, true, exprEvaluatorContext);
if ((pass == null) || (!pass)) {
continue;
}
}
hasRows = true;
Object valueRight;
if (selectEval != null) {
valueRight = selectEval.evaluate(events, true, exprEvaluatorContext);
} else {
valueRight = events[0].getUnderlying();
}
if (valueRight != null) {
hasNonNullRow = true;
}
if ((leftResult != null) && (valueRight != null)) {
if (computer.compare(leftResult, valueRight)) {
return true;
}
}
}
if (!hasRows) {
return false;
}
if ((!hasNonNullRow) || (leftResult == null)) {
return null;
}
return false;
}
}