MeanAggregator.java

/*
 *  RapidMiner
 *
 *  Copyright (C) 2001-2014 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 MeanAggregationFunction}
 * 
 * @author Sebastian Land
 */
public class MeanAggregator extends NumericalAggregator {

    private double sum = 0;
    private double totalWeight = 0;

    public MeanAggregator(AggregationFunction function) {
        super(function);
    }

    @Override
    public void count(double value) {
        sum += value;
        totalWeight++;
    }

    @Override
    public void count(double value, double weight) {
        sum += value * weight;
        totalWeight += weight;
    }

    @Override
    public double getValue() {
        return sum / totalWeight;
    }

    @Override
	public void setValue(double value) {
		this.sum = value;
	}

}