/*
***************************************************************************************
* 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.core;
import com.espertech.esper.client.EventBean;
public class ExprNodeUtilUnderlyingEvaluator implements ExprEvaluator {
private final int streamNum;
private final Class resultType;
public ExprNodeUtilUnderlyingEvaluator(int streamNum, Class resultType) {
this.streamNum = streamNum;
this.resultType = resultType;
}
public Object evaluate(EventBean[] eventsPerStream, boolean isNewData, ExprEvaluatorContext context) {
if ((eventsPerStream == null) || (eventsPerStream[streamNum] == null)) {
return null;
}
return eventsPerStream[streamNum].getUnderlying();
}
public Class getType() {
return resultType;
}
}