/**
* Copyright (C) 2001-2017 by RapidMiner and the contributors
*
* Complete list of developers available at our web site:
*
* http://rapidminer.com
*
* This program is free software: you can redistribute it and/or modify it under the terms of the
* GNU Affero General Public License as published by the Free Software Foundation, either version 3
* of the License, or (at your option) any later version.
*
* This program is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without
* even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Affero General Public License for more details.
*
* You should have received a copy of the GNU Affero General Public License along with this program.
* If not, see http://www.gnu.org/licenses/.
*/
package com.rapidminer.operator.preprocessing.transformation.aggregation;
/**
* This is an {@link Aggregator} for the {@link MaxAggregationFunction}
*
* @author Sebastian Land
*/
public class MaxAggregator extends NumericalAggregator {
private double max = Double.NEGATIVE_INFINITY;
private boolean hasValue = false;
public MaxAggregator(AggregationFunction function) {
super(function);
}
@Override
public void count(double value) {
hasValue = true;
if (max < value) { // NaN would always return false: Implicit NaN check
max = value;
}
}
@Override
protected void count(double value, double weight) {
hasValue = true;
if (max < value) { // NaN would always return false: Implicit NaN check
max = value;
}
}
@Override
public double getValue() {
if (hasValue) {
return max;
} else {
return Double.NaN;
}
}
@Override
public void setValue(double value) {
this.max = value;
}
}