/**************************************************************************************
* 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.lookup;
import com.espertech.esper.client.EventPropertyGetter;
import com.espertech.esper.client.EventType;
import com.espertech.esper.epl.join.table.EventTable;
import com.espertech.esper.epl.join.table.PropertyIndexedEventTable;
import java.util.Arrays;
/**
* Index lookup strategy for subqueries.
*/
public class SubordIndexedTableLookupStrategyPropFactory implements SubordTableLookupStrategyFactory
{
private final String[] properties;
/**
* Stream numbers to get key values from.
*/
private final int[] keyStreamNums;
/**
* Getters to use to get key values.
*/
private final EventPropertyGetter[] propertyGetters;
private final LookupStrategyDesc strategyDesc;
/**
* Ctor.
* @param eventTypes is the event types per stream
* @param keyStreamNumbers is the stream number per property
* @param properties is the key properties
*/
public SubordIndexedTableLookupStrategyPropFactory(boolean isNWOnTrigger, EventType[] eventTypes, int[] keyStreamNumbers, String[] properties)
{
this.keyStreamNums = keyStreamNumbers;
this.properties = properties;
this.strategyDesc = new LookupStrategyDesc(LookupStrategyType.MULTIPROP, properties);
propertyGetters = new EventPropertyGetter[properties.length];
for (int i = 0; i < keyStreamNumbers.length; i++)
{
int streamNumber = keyStreamNumbers[i];
String property = properties[i];
EventType eventType = eventTypes[streamNumber];
propertyGetters[i] = eventType.getGetter(property);
if (propertyGetters[i] == null)
{
throw new IllegalArgumentException("Property named '" + properties[i] + "' is invalid for type " + eventType);
}
}
for (int i = 0; i < keyStreamNums.length; i++) {
keyStreamNums[i] += (isNWOnTrigger ? 1 : 0); // for on-trigger the key will be provided in a {1,2,...} stream and not {0,...}
}
}
public SubordTableLookupStrategy makeStrategy(EventTable eventTable) {
return new SubordIndexedTableLookupStrategyProp(keyStreamNums, propertyGetters, (PropertyIndexedEventTable) eventTable, strategyDesc);
}
/**
* Returns properties to use from lookup event to look up in index.
* @return properties to use from lookup event
*/
public String[] getProperties()
{
return properties;
}
public String toQueryPlan() {
return this.getClass().getSimpleName() +
" indexProps=" + Arrays.toString(properties) +
" keyStreamNums=" + Arrays.toString(keyStreamNums);
}
}