1   /*
2    * Copyright (c) 2004-2008 QOS.ch
3    * All rights reserved.
4    * 
5    * Permission is hereby granted, free  of charge, to any person obtaining
6    * a  copy  of this  software  and  associated  documentation files  (the
7    * "Software"), to  deal in  the Software without  restriction, including
8    * without limitation  the rights to  use, copy, modify,  merge, publish,
9    * distribute,  sublicense, and/or sell  copies of  the Software,  and to
10   * permit persons to whom the Software  is furnished to do so, subject to
11   * the following conditions:
12   * 
13   * The  above  copyright  notice  and  this permission  notice  shall  be
14   * included in all copies or substantial portions of the Software.
15   * 
16   * THE  SOFTWARE IS  PROVIDED  "AS  IS", WITHOUT  WARRANTY  OF ANY  KIND,
17   * EXPRESS OR  IMPLIED, INCLUDING  BUT NOT LIMITED  TO THE  WARRANTIES OF
18   * MERCHANTABILITY,    FITNESS    FOR    A   PARTICULAR    PURPOSE    AND
19   * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
20   * LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
21   * OF CONTRACT, TORT OR OTHERWISE,  ARISING FROM, OUT OF OR IN CONNECTION
22   * WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
23   */
24  
25  package org.slf4j.helpers;
26  
27  
28  class MyRandom  {
29  
30    private static final long serialVersionUID = -907426287094698288L;
31  
32    private final static long m = 200000000041L;  // a prime number
33    private final static long a = 2000000011L; // a prime number
34    
35    long y;
36    long unused;
37    int bits = 32;
38    
39    public MyRandom() { 
40      this(System.nanoTime()); 
41    }
42  
43    
44    public MyRandom(long seed) { 
45      this.y = seed; 
46    }
47    
48    
49    int nextInt() {
50      // we don't really care about the randomness of this
51      // generator
52      y = (a*y + 1) % m;
53      unused = y >>> (48-bits); // just exercise the >>> operator
54      return (int)(y);
55    }
56  }