/**************************************************************************************
* 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.PropertySortedEventTableCoercedFactory;
import com.espertech.esper.epl.join.table.PropertySortedEventTableFactory;
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 PollResultIndexingStrategySorted implements PollResultIndexingStrategy
{
private final int streamNum;
private final EventType eventType;
private final String propertyName;
private final Class coercionType;
/**
* Ctor.
* @param streamNum is the stream number of the indexed stream
* @param eventType is the event type of the indexed stream
*/
public PollResultIndexingStrategySorted(int streamNum, EventType eventType, String propertyName, Class coercionType)
{
this.streamNum = streamNum;
this.eventType = eventType;
this.propertyName = propertyName;
this.coercionType = coercionType;
}
public EventTable index(List<EventBean> pollResult, boolean isActiveCache)
{
if (!isActiveCache)
{
return new UnindexedEventTableList(pollResult);
}
PropertySortedEventTableFactory tableFactory;
if (coercionType == null) {
tableFactory = new PropertySortedEventTableFactory(streamNum, eventType, propertyName);
}
else {
tableFactory = new PropertySortedEventTableCoercedFactory(streamNum, eventType, propertyName, coercionType);
}
EventTable table = tableFactory.makeEventTable();
table.add(pollResult.toArray(new EventBean[pollResult.size()]));
return table;
}
public String toQueryPlan() {
return this.getClass().getSimpleName() + " property " + propertyName + " coercion " + coercionType;
}
}