com.espertech.esper.epl.agg.access.AggregationAccessorLastNoEval Maven / Gradle / Ivy
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Complex event processing and event series analysis component
/*
* *************************************************************************************
* Copyright (C) 2006-2015 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.agg.access;
import com.espertech.esper.client.EventBean;
import com.espertech.esper.epl.expression.core.ExprEvaluatorContext;
import java.util.Collection;
import java.util.Collections;
public class AggregationAccessorLastNoEval implements AggregationAccessor {
public final static AggregationAccessorLastNoEval INSTANCE = new AggregationAccessorLastNoEval();
public Object getValue(AggregationState state, EventBean[] eventsPerStream, boolean isNewData, ExprEvaluatorContext exprEvaluatorContext) {
EventBean bean = ((AggregationStateLinear) state).getLastValue();
if (bean == null) {
return null;
}
return bean.getUnderlying();
}
public Collection getEnumerableEvents(AggregationState state, EventBean[] eventsPerStream, boolean isNewData, ExprEvaluatorContext exprEvaluatorContext) {
EventBean bean = ((AggregationStateLinear) state).getLastValue();
if (bean == null) {
return null;
}
return Collections.singletonList(bean);
}
public Collection
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