/*
***************************************************************************************
* 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.aggregator;
import com.espertech.esper.type.MinMaxTypeEnum;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
/**
* Min/max aggregator for all values, not considering events leaving the aggregation (i.e. ever).
*/
public class AggregatorMinMaxEver implements AggregationMethod {
private static final Logger log = LoggerFactory.getLogger(AggregatorMinMaxEver.class);
protected final MinMaxTypeEnum minMaxTypeEnum;
protected Comparable currentMinMax;
/**
* Ctor.
*
* @param minMaxTypeEnum - enum indicating to return minimum or maximum values
*/
public AggregatorMinMaxEver(MinMaxTypeEnum minMaxTypeEnum) {
this.minMaxTypeEnum = minMaxTypeEnum;
}
public void clear() {
currentMinMax = null;
}
public void enter(Object object) {
if (object == null) {
return;
}
if (currentMinMax == null) {
currentMinMax = (Comparable) object;
return;
}
if (minMaxTypeEnum == MinMaxTypeEnum.MAX) {
if (currentMinMax.compareTo(object) < 0) {
currentMinMax = (Comparable) object;
}
} else {
if (currentMinMax.compareTo(object) > 0) {
currentMinMax = (Comparable) object;
}
}
}
public void leave(Object object) {
// no-op, this is designed to handle min-max ever
log.warn(".leave Received remove stream, none was expected");
}
public Object getValue() {
return currentMinMax;
}
public void setCurrentMinMax(Comparable currentMinMax) {
this.currentMinMax = currentMinMax;
}
public Comparable getCurrentMinMax() {
return currentMinMax;
}
}