no.abmu.test.util.randomgenerator.RandomGeneratorUtil.java Source code

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Here is the source code for no.abmu.test.util.randomgenerator.RandomGeneratorUtil.java

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/*$Id: RandomGeneratorUtil.java 13605 2009-04-02 11:42:57Z jens $*/
/*
 ****************************************************************************
 *                                                                          *
 *                   (c) Copyright 2009 ABM-utvikling                       *
 *                                                                          *
 * This program is free software; you can redistribute it and/or modify it  *
 * under the terms of the GNU General Public License as published by the    *
 * Free Software Foundation; either version 2 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 General *
 * Public License for more details. http://www.gnu.org/licenses/gpl.html    *
 *                                                                          *
 ****************************************************************************
 */

package no.abmu.test.util.randomgenerator;

import java.util.Random;

import no.abmu.util.test.Assert;

import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;

/**
 * Provides useful helpers for generating random values.
 *
 * @author Jens Vindvad, Jens.Vindvad@abm-utvikling.no
 * @author $Author: jens $
 * @version $Rev: 13605 $
 * @date $Date: 2009-04-02 13:42:57 +0200 (Thu, 02 Apr 2009) $
 * @copyright ABM-Utvikling
 */
public final class RandomGeneratorUtil {

    private static final Random randomGenerator = new Random();
    private static final Log logger = (Log) LogFactory.getLog(RandomGeneratorUtil.class);

    private RandomGeneratorUtil() {
    }

    public static Integer createRandomInteger() {
        return randomGenerator.nextInt();
    }

    public static Long createRandomLong() {
        return randomGenerator.nextLong();
    }

    public static String createRandomString() {
        return String.valueOf(randomGenerator.nextLong());
    }

    public static Integer createRandomADifferentInteger(Integer oldValue) {
        Assert.checkRequiredArgument("oldValue", oldValue);

        Integer newRandomValue = createRandomInteger();

        // Just to be sure new value are different from old value.
        while (oldValue.equals(newRandomValue)) {
            String warningMessage = "[createRandomADifferentInteger] new and old integer has same value ='"
                    + oldValue + "'.";
            System.out.println(warningMessage);
            logger.warn(warningMessage);
            newRandomValue = createRandomInteger();
        }
        return newRandomValue;
    }

    public static Long createRandomADifferentLong(Long oldValue) {
        Assert.checkRequiredArgument("oldValue", oldValue);

        Long newRandomValue = createRandomLong();

        // Just to be sure new value are different from old value.
        while (oldValue.equals(newRandomValue)) {
            String warningMessage = "[createRandomADifferentLong] new and old long has same value ='" + oldValue
                    + "'.";
            System.out.println(warningMessage);
            logger.warn(warningMessage);
            newRandomValue = createRandomLong();
        }

        return newRandomValue;
    }

}