/*
***************************************************************************************
* 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.join.exec.base;
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.join.plan.InKeywordTableLookupUtil;
import com.espertech.esper.epl.join.rep.Cursor;
import com.espertech.esper.epl.join.table.PropertyIndexedEventTableSingle;
import com.espertech.esper.epl.lookup.LookupStrategyDesc;
import java.util.Set;
/**
* Lookup on an index using a set of expression results as key values.
*/
public class InKeywordMultiTableLookupStrategyExpr implements JoinExecTableLookupStrategy {
private final PropertyIndexedEventTableSingle[] indexes;
private final int streamNum;
private final EventBean[] eventsPerStream;
private final ExprEvaluator evaluator;
private final LookupStrategyDesc lookupStrategyDesc;
public InKeywordMultiTableLookupStrategyExpr(ExprEvaluator evaluator, int streamNum, PropertyIndexedEventTableSingle[] indexes, LookupStrategyDesc lookupStrategyDesc) {
if (indexes == null) {
throw new IllegalArgumentException("Unexpected null index received");
}
this.indexes = indexes;
this.streamNum = streamNum;
this.eventsPerStream = new EventBean[streamNum + 1];
this.evaluator = evaluator;
this.lookupStrategyDesc = lookupStrategyDesc;
}
/**
* Returns index to look up in.
*
* @return index to use
*/
public PropertyIndexedEventTableSingle[] getIndex() {
return indexes;
}
public Set<EventBean> lookup(EventBean theEvent, Cursor cursor, ExprEvaluatorContext exprEvaluatorContext) {
eventsPerStream[streamNum] = theEvent;
return InKeywordTableLookupUtil.multiIndexLookup(evaluator, eventsPerStream, exprEvaluatorContext, indexes);
}
public String toString() {
return this.getClass().getSimpleName() + " " + lookupStrategyDesc.toString();
}
public LookupStrategyDesc getStrategyDesc() {
return lookupStrategyDesc;
}
}