/*
***************************************************************************************
* 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.agg.service;
import com.espertech.esper.epl.variable.VariableReader;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
/**
* Implementation for handling aggregation with grouping by group-keys.
*/
public class AggSvcGroupByReclaimAgedEvalFuncVariable implements AggSvcGroupByReclaimAgedEvalFunc {
private static final Logger log = LoggerFactory.getLogger(AggSvcGroupByReclaimAgedEvalFuncVariable.class);
private VariableReader variableReader;
public AggSvcGroupByReclaimAgedEvalFuncVariable(VariableReader variableReader) {
this.variableReader = variableReader;
}
public Double getLongValue() {
Object val = variableReader.getValue();
if ((val != null) && (val instanceof Number)) {
return ((Number) val).doubleValue();
}
log.warn("Variable '" + variableReader.getVariableMetaData().getVariableName() + " returned a null value, using last valid value");
return null;
}
}