/*
***************************************************************************************
* 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.lookup;
import com.espertech.esper.epl.expression.core.ExprEvaluator;
import com.espertech.esper.epl.expression.core.ExprNode;
import com.espertech.esper.epl.expression.core.ExprNodeUtility;
import com.espertech.esper.epl.join.table.EventTable;
import com.espertech.esper.epl.join.table.PropertyIndexedEventTableSingle;
import com.espertech.esper.epl.virtualdw.VirtualDWView;
/**
* Index lookup strategy for subqueries.
*/
public class SubordInKeywordSingleTableLookupStrategyFactory implements SubordTableLookupStrategyFactory {
protected final ExprEvaluator[] evaluators;
protected boolean isNWOnTrigger;
protected int streamCountOuter;
protected final LookupStrategyDesc strategyDesc;
public SubordInKeywordSingleTableLookupStrategyFactory(boolean isNWOnTrigger, int streamCountOuter, ExprNode[] exprNodes) {
this.streamCountOuter = streamCountOuter;
this.evaluators = ExprNodeUtility.getEvaluators(exprNodes);
this.isNWOnTrigger = isNWOnTrigger;
this.strategyDesc = new LookupStrategyDesc(LookupStrategyType.INKEYWORDSINGLEIDX, ExprNodeUtility.toExpressionStringsMinPrecedence(exprNodes));
}
public SubordTableLookupStrategy makeStrategy(EventTable[] eventTable, VirtualDWView vdw) {
if (isNWOnTrigger) {
return new SubordInKeywordSingleTableLookupStrategyNW(evaluators, (PropertyIndexedEventTableSingle) eventTable[0], strategyDesc);
} else {
return new SubordInKeywordSingleTableLookupStrategy(streamCountOuter, evaluators, (PropertyIndexedEventTableSingle) eventTable[0], strategyDesc);
}
}
public String toQueryPlan() {
return this.getClass().getSimpleName();
}
}