1 /**
2 * Logback: the reliable, generic, fast and flexible logging framework.
3 * Copyright (C) 1999-2015, QOS.ch. All rights reserved.
4 *
5 * This program and the accompanying materials are dual-licensed under
6 * either the terms of the Eclipse Public License v1.0 as published by
7 * the Eclipse Foundation
8 *
9 * or (per the licensee's choosing)
10 *
11 * under the terms of the GNU Lesser General Public License version 2.1
12 * as published by the Free Software Foundation.
13 */
14 package ch.qos.logback.classic.corpus;
15
16 import java.util.Random;
17
18 public class RandomUtil {
19
20 /**
21 * Approximate a gaussian distribution with only positive integer values
22 *
23 * @param average
24 * @param stdDeviation
25 * @return
26 */
27 static public int gaussianAsPositiveInt(Random random, int average, int stdDeviation) {
28 if (average < 1) {
29 throw new IllegalArgumentException("The average must not be smaller than 1.");
30 }
31
32 if (stdDeviation < 1) {
33 throw new IllegalArgumentException("The stdDeviation must not be smaller than 1.");
34 }
35
36 double d = random.nextGaussian() * stdDeviation + average;
37 int result = 1;
38 if (d > 1.0) {
39 result = (int) Math.round(d);
40 }
41 return result;
42 }
43 }