/**************************************************************************************
* 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.expression;
import com.espertech.esper.client.EventBean;
import com.espertech.esper.view.window.RelativeAccessByEventNIndex;
/**
* Represents the 'prior' prior event function in an expression node tree.
*/
public class ExprPriorEvalStrategyRelativeAccess extends ExprPriorEvalStrategyBase
{
private final transient RelativeAccessByEventNIndex relativeAccess;
public ExprPriorEvalStrategyRelativeAccess(RelativeAccessByEventNIndex relativeAccess) {
this.relativeAccess = relativeAccess;
}
public EventBean getSubstituteEvent(EventBean originalEvent, boolean isNewData, int constantIndexNumber) {
return relativeAccess.getRelativeToEvent(originalEvent, constantIndexNumber);
}
}