SubordIndexedTableLookupStrategySinglePropFactory.java

/**************************************************************************************
 * 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.PropertyIndexedEventTableSingle;
import com.espertech.esper.epl.join.table.PropertyIndexedEventTableSingleUnique;
import com.espertech.esper.event.EventBeanUtility;

/**
 * Index lookup strategy for subqueries.
 */
public class SubordIndexedTableLookupStrategySinglePropFactory implements SubordTableLookupStrategyFactory
{
    private final String property;

    /**
     * Stream numbers to get key values from.
     */
    protected final int keyStreamNum;

    /**
     * Getters to use to get key values.
     */
    protected final EventPropertyGetter propertyGetter;

    /**
     * Ctor.
     * @param eventTypes is the event types per stream
     * @param keyStreamNum is the stream number per property
     * @param property is the key properties
     */
    public SubordIndexedTableLookupStrategySinglePropFactory(boolean isNWOnTrigger, EventType[] eventTypes, int keyStreamNum, String property)
    {
        this.keyStreamNum = keyStreamNum + (isNWOnTrigger ? 1 : 0); // for on-trigger the key will be provided in a {1,2,...} stream and not {0,...}
        this.property = property;
        propertyGetter = EventBeanUtility.getAssertPropertyGetter(eventTypes, keyStreamNum, property);
    }

    public SubordTableLookupStrategy makeStrategy(EventTable eventTable) {
        if (eventTable instanceof PropertyIndexedEventTableSingleUnique) {
            return new SubordIndexedTableLookupStrategySinglePropUnique(keyStreamNum, propertyGetter, (PropertyIndexedEventTableSingleUnique) eventTable);
        }
        return new SubordIndexedTableLookupStrategySingleProp(keyStreamNum, propertyGetter, (PropertyIndexedEventTableSingle) eventTable);
    }

    public String toString()
    {
        return toQueryPlan();
    }

    public String toQueryPlan() {
        return this.getClass().getSimpleName() + " property=" + property + " stream=" + keyStreamNum;
    }
}