/*
***************************************************************************************
* 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.pollindex;
import com.espertech.esper.client.EventBean;
import com.espertech.esper.client.EventType;
import com.espertech.esper.core.service.ExprEvaluatorContextStatement;
import com.espertech.esper.core.service.StatementContext;
import com.espertech.esper.epl.join.table.EventTable;
import com.espertech.esper.epl.join.table.EventTableFactoryTableIdentStmt;
import com.espertech.esper.epl.join.table.PropertyIndexedEventTableSingleFactory;
import com.espertech.esper.epl.join.table.UnindexedEventTableList;
import java.util.Arrays;
import java.util.List;
/**
* Strategy for building an index out of poll-results knowing the properties to base the index on.
*/
public class PollResultIndexingStrategyIndexSingleArray implements PollResultIndexingStrategy {
private final int streamNum;
private final EventType eventType;
private final String[] propertyNames;
/**
* Ctor.
*
* @param streamNum is the stream number of the indexed stream
* @param eventType is the event type of the indexed stream
* @param propertyNames is the property names to be indexed
*/
public PollResultIndexingStrategyIndexSingleArray(int streamNum, EventType eventType, String[] propertyNames) {
this.streamNum = streamNum;
this.eventType = eventType;
this.propertyNames = propertyNames;
}
public EventTable[] index(List<EventBean> pollResult, boolean isActiveCache, StatementContext statementContext) {
if (!isActiveCache) {
return new EventTable[]{new UnindexedEventTableList(pollResult, streamNum)};
}
EventTable[] tables = new EventTable[propertyNames.length];
ExprEvaluatorContextStatement evaluatorContextStatement = new ExprEvaluatorContextStatement(statementContext, false);
for (int i = 0; i < propertyNames.length; i++) {
PropertyIndexedEventTableSingleFactory factory = new PropertyIndexedEventTableSingleFactory(streamNum, eventType, propertyNames[i], false, null);
tables[i] = factory.makeEventTables(new EventTableFactoryTableIdentStmt(statementContext), evaluatorContextStatement)[0];
tables[i].add(pollResult.toArray(new EventBean[pollResult.size()]), evaluatorContextStatement);
}
return tables;
}
public String toQueryPlan() {
return this.getClass().getSimpleName() + " properties " + Arrays.toString(propertyNames);
}
}