Alea.java :  » Database-ORM » Speedo_1.4.5 » org » objectweb » speedo » Java Open Source

/**
 * Copyright (C) 2001-2004 France Telecom R&D
 *
 * This library is free software; you can redistribute it and/or
 * modify it under the terms of the GNU Lesser General Public
 * License as published by the Free Software Foundation; either
 * version 2 of the License, or (at your option) any later version.
 *
 * This library 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
 * Lesser General Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public
 * License along with this library; if not, write to the Free Software
 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
 */
package org.objectweb.speedo;

import java.util.*;

/**
 * Generate random number and string.
 * 
 */
final public class Alea {

  private static Random rn = new Random();

  private Alea() {
  }

  public static int rand(int lo, int hi) {
    int n = hi - lo + 1;
    int i = rn.nextInt() % n;
    if (i < 0)
      i = -i;
    return lo + i;
  }

  public static String randomstring(int lo, int hi) {
    int n = rand(lo, hi);
    byte b[] = new byte[n];
    for (int i = 0; i < n; i++)
      b[i] = (byte) rand('a', 'z');
    return new String(b, 0, 0, b.length);
  }

  public static String randomstring() {
    return randomstring(5, 25);
  }
}