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package org.apache.juneau.utils;

/**
 * A simple weighted average of numbers.
 *
 * 
See Also:
    *
*/ public class WeightedAverage { private Double value = 0d; private int weight = 0; /** * Add a number with a weight to this average. * * @param w The weight of the new value. * @param v The new value. * @return This object. */ public WeightedAverage add(int w, Number v) { if (v != null) { try { double w1 = weight, w2 = w; weight = Math.addExact(weight, w); if (weight != 0) { value = (value * (w1/weight)) + (v.floatValue() * (w2/weight)); } } catch (ArithmeticException ae) { throw new ArithmeticException("Weight overflow."); } } return this; } /** * Returns the weighted average of all numbers. * * @return The weighted average of all numbers. */ public double getValue() { return value; } }




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