/*
***************************************************************************************
* 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.subquery;
import com.espertech.esper.client.EventBean;
import com.espertech.esper.collection.MultiKeyUntyped;
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 java.util.Collection;
public abstract class SubselectAggregationPreprocessorBase {
protected final AggregationService aggregationService;
protected final ExprEvaluator filterEval;
protected final ExprEvaluator[] groupKeys;
public SubselectAggregationPreprocessorBase(AggregationService aggregationService, ExprEvaluator filterEval, ExprEvaluator[] groupKeys) {
this.aggregationService = aggregationService;
this.filterEval = filterEval;
this.groupKeys = groupKeys;
}
public abstract void evaluate(EventBean[] eventsPerStream, Collection<EventBean> matchingEvents, ExprEvaluatorContext exprEvaluatorContext);
protected Object generateGroupKey(EventBean[] eventsPerStream, boolean isNewData, ExprEvaluatorContext exprEvaluatorContext) {
if (groupKeys.length == 1) {
return groupKeys[0].evaluate(eventsPerStream, isNewData, exprEvaluatorContext);
}
Object[] keys = new Object[groupKeys.length];
for (int i = 0; i < groupKeys.length; i++) {
keys[i] = groupKeys[i].evaluate(eventsPerStream, isNewData, exprEvaluatorContext);
}
return new MultiKeyUntyped(keys);
}
}