/*
***************************************************************************************
* 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.client.EventBean;
import com.espertech.esper.epl.expression.core.ExprEvaluator;
import com.espertech.esper.epl.expression.core.ExprEvaluatorContext;
import com.espertech.esper.epl.expression.core.ExprNodeUtility;
import com.espertech.esper.epl.join.plan.InKeywordTableLookupUtil;
import com.espertech.esper.epl.join.table.PropertyIndexedEventTableSingle;
import com.espertech.esper.metrics.instrumentation.InstrumentationHelper;
import java.util.Collection;
import java.util.Set;
/**
* Index lookup strategy for subqueries for in-keyword single-index sided.
*/
public class SubordInKeywordSingleTableLookupStrategyNW implements SubordTableLookupStrategy {
/**
* Index to look up in.
*/
protected final PropertyIndexedEventTableSingle index;
protected final ExprEvaluator[] evaluators;
protected final LookupStrategyDesc strategyDesc;
public SubordInKeywordSingleTableLookupStrategyNW(ExprEvaluator[] evaluators, PropertyIndexedEventTableSingle index, LookupStrategyDesc strategyDesc) {
this.evaluators = evaluators;
this.index = index;
this.strategyDesc = strategyDesc;
}
/**
* Returns index to look up in.
*
* @return index to use
*/
public PropertyIndexedEventTableSingle getIndex() {
return index;
}
public Collection<EventBean> lookup(EventBean[] eventsPerStream, ExprEvaluatorContext context) {
if (InstrumentationHelper.ENABLED) {
InstrumentationHelper.get().qIndexSubordLookup(this, index, null);
}
Set<EventBean> result = InKeywordTableLookupUtil.singleIndexLookup(evaluators, eventsPerStream, context, index);
if (InstrumentationHelper.ENABLED) {
InstrumentationHelper.get().aIndexSubordLookup(result, null);
}
return result;
}
public LookupStrategyDesc getStrategyDesc() {
return strategyDesc;
}
public String toQueryPlan() {
return this.getClass().getSimpleName() + " evaluators " + ExprNodeUtility.printEvaluators(evaluators);
}
}