private static void scaleWeights()

in commons-rng-sampling/src/main/java/org/apache/commons/rng/sampling/distribution/FastLoadedDiceRollerDiscreteSampler.java [579:603]

• 20 lines of code
• 8 McCabe index (conditional complexity)

    private static void scaleWeights(long[] values, int[] exponents) {
        // Find the minimum exponent and common trailing zeros.
        int minExponent = Integer.MAX_VALUE;
        for (int i = 0; i < exponents.length; i++) {
            if (values[i] != 0) {
                minExponent = Math.min(minExponent, exponents[i]);
            }
        }
        // Trailing zeros occur when the original weights have a representation with
        // less than 52 binary digits, e.g. {1.5, 0.5, 0.25}.
        int trailingZeros = Long.SIZE;
        for (int i = 0; i < values.length && trailingZeros != 0; i++) {
            trailingZeros = Math.min(trailingZeros, Long.numberOfTrailingZeros(values[i]));
        }
        // Scale by a power of 2 so the minimum exponent is zero.
        for (int i = 0; i < exponents.length; i++) {
            exponents[i] -= minExponent;
        }
        // Remove common trailing zeros.
        if (trailingZeros != 0) {
            for (int i = 0; i < values.length; i++) {
                values[i] >>>= trailingZeros;
            }
        }
    }