/*
***************************************************************************************
* 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 SubselectEvalStrategyNRRelOpAllDefault extends SubselectEvalStrategyNRRelOpBase {
private final ExprEvaluator filterOrHavingEval;
public SubselectEvalStrategyNRRelOpAllDefault(ExprEvaluator valueEval, ExprEvaluator selectEval, boolean resultWhenNoMatchingEvents, RelationalOpEnum.Computer computer, ExprEvaluator filterOrHavingEval) {
super(valueEval, selectEval, resultWhenNoMatchingEvents, computer);
this.filterOrHavingEval = filterOrHavingEval;
}
protected Object evaluateInternal(Object leftResult, EventBean[] events, boolean isNewData, Collection<EventBean> matchingEvents, ExprEvaluatorContext exprEvaluatorContext, AggregationService aggregationService) {
boolean hasRows = false;
boolean hasNullRow = false;
for (EventBean subselectEvent : matchingEvents) {
events[0] = subselectEvent;
if (filterOrHavingEval != null) {
Boolean pass = (Boolean) filterOrHavingEval.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) {
hasNullRow = true;
} else {
if (leftResult != null) {
if (!computer.compare(leftResult, valueRight)) {
return false;
}
}
}
}
if (!hasRows) {
return true;
}
if (leftResult == null) {
return null;
}
if (hasNullRow) {
return null;
}
return true;
}
}