com.espertech.esper.epl.join.base.HistoricalIndexLookupStrategyInKeywordMulti Maven / Gradle / Ivy
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Complex event processing and event series analysis component
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/*
***************************************************************************************
* 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.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.expression.core.ExprNode;
import com.espertech.esper.epl.join.plan.InKeywordTableLookupUtil;
import com.espertech.esper.epl.join.table.EventTable;
import java.util.Iterator;
import java.util.Set;
/**
* Index lookup strategy into a poll-based cache result.
*/
public class HistoricalIndexLookupStrategyInKeywordMulti implements HistoricalIndexLookupStrategy {
private final EventBean[] eventsPerStream;
private final ExprEvaluator evaluator;
private final int lookupStream;
public HistoricalIndexLookupStrategyInKeywordMulti(int lookupStream, ExprNode expression) {
this.eventsPerStream = new EventBean[lookupStream + 1];
this.evaluator = expression.getForge().getExprEvaluator();
this.lookupStream = lookupStream;
}
public Iterator lookup(EventBean lookupEvent, EventTable[] indexTable, ExprEvaluatorContext exprEvaluatorContext) {
eventsPerStream[lookupStream] = lookupEvent;
Set result = InKeywordTableLookupUtil.multiIndexLookup(evaluator, eventsPerStream, exprEvaluatorContext, indexTable);
if (result == null) {
return null;
}
return result.iterator();
}
public String toQueryPlan() {
return this.getClass().getSimpleName();
}
}