/**************************************************************************************
* 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.RandomAccessByIndex;
import com.espertech.esper.view.window.RandomAccessByIndexGetter;
import com.espertech.esper.view.window.RelativeAccessByEventNIndex;
import com.espertech.esper.view.window.RelativeAccessByEventNIndexMap;
import java.util.Collection;
public class ExprPreviousEvalStrategyCount implements ExprPreviousEvalStrategy
{
private final int streamNumber;
private final RandomAccessByIndexGetter randomAccessGetter;
private final RelativeAccessByEventNIndexMap relativeAccessGetter;
public ExprPreviousEvalStrategyCount(int streamNumber, RandomAccessByIndexGetter randomAccessGetter, RelativeAccessByEventNIndexMap relativeAccessGetter)
{
this.streamNumber = streamNumber;
this.randomAccessGetter = randomAccessGetter;
this.relativeAccessGetter = relativeAccessGetter;
}
public Object evaluate(EventBean[] eventsPerStream, ExprEvaluatorContext exprEvaluatorContext)
{
long size;
if (randomAccessGetter != null)
{
RandomAccessByIndex randomAccess = randomAccessGetter.getAccessor();
size = randomAccess.getWindowCount();
}
else
{
EventBean evalEvent = eventsPerStream[streamNumber];
RelativeAccessByEventNIndex relativeAccess = relativeAccessGetter.getAccessor(evalEvent);
size = relativeAccess.getWindowToEventCount(evalEvent);
}
return size;
}
public Collection<EventBean> evaluateGetCollEvents(EventBean[] eventsPerStream, ExprEvaluatorContext context) {
return null;
}
public Collection evaluateGetCollScalar(EventBean[] eventsPerStream, ExprEvaluatorContext context) {
return null;
}
public EventBean evaluateGetEventBean(EventBean[] eventsPerStream, ExprEvaluatorContext context) {
return null;
}
}