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A modified version of the GGP-Base library for Alloy.

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package org.ggp.base.apps.research;

/**
 * WeightedAverage is a convenience class for tracking a weighted average.
 *
 * @author Sam Schreiber
 */
public final class WeightedAverage implements Comparable
{
    private double totalValue = 0, totalWeight = 0;

    public void addValue(double value) {
        addValue(value, 1.0);
    }

    public void addValue(double value, double weight) {
        totalValue += value;
        totalWeight += weight;
    }

    public double getValue() {
        return totalValue / totalWeight;
    }

    public double getWeight() {
        return totalWeight;
    }

    @Override
    public String toString() {
        return "" + ((int)(getValue() * 1000.0)/1000.0) + " [" + getWeight() + "]";
    }

    @Override
    public int compareTo(WeightedAverage arg0) {
        return (int)Math.signum(getValue() - arg0.getValue());
    }
}