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