/**************************************************************************************
* Copyright (C) 2008 EsperTech, Inc. All rights reserved. *
* http://esper.codehaus.org *
* 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.pollindex;
import com.espertech.esper.client.EventBean;
import com.espertech.esper.client.EventType;
import com.espertech.esper.epl.join.table.EventTable;
import com.espertech.esper.epl.join.table.PropertyIndexedEventTableSingleFactory;
import com.espertech.esper.epl.join.table.UnindexedEventTableList;
import java.util.List;
/**
* Strategy for building an index out of poll-results knowing the properties to base the index on.
*/
public class PollResultIndexingStrategyIndexSingle implements PollResultIndexingStrategy
{
private final int streamNum;
private final EventType eventType;
private final String propertyName;
/**
* Ctor.
* @param streamNum is the stream number of the indexed stream
* @param eventType is the event type of the indexed stream
* @param propertyName is the property names to be indexed
*/
public PollResultIndexingStrategyIndexSingle(int streamNum, EventType eventType, String propertyName)
{
this.streamNum = streamNum;
this.eventType = eventType;
this.propertyName = propertyName;
}
public EventTable[] index(List<EventBean> pollResult, boolean isActiveCache)
{
if (!isActiveCache)
{
return new EventTable[] {new UnindexedEventTableList(pollResult, streamNum)};
}
PropertyIndexedEventTableSingleFactory factory = new PropertyIndexedEventTableSingleFactory(streamNum, eventType, propertyName, false, null);
EventTable[] tables = factory.makeEventTables();
for (EventTable table : tables) {
table.add(pollResult.toArray(new EventBean[pollResult.size()]));
}
return tables;
}
public String toQueryPlan() {
return this.getClass().getSimpleName() + " properties " + propertyName;
}
}