/**************************************************************************************
* 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 java.util.Collection;
public interface ExprPreviousEvalStrategy
{
public Object evaluate(EventBean[] eventsPerStream, ExprEvaluatorContext exprEvaluatorContext);
public Collection<EventBean> evaluateGetCollEvents(EventBean[] eventsPerStream, ExprEvaluatorContext context);
public Collection evaluateGetCollScalar(EventBean[] eventsPerStream, ExprEvaluatorContext context);
public EventBean evaluateGetEventBean(EventBean[] eventsPerStream, ExprEvaluatorContext context);
}