/*
* Copyright (C) 2005 Luca Veltri - University of Parma - Italy
*
* This file is part of MjSip (http://www.mjsip.org)
*
* MjSip 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.
*
* MjSip 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.
*
* You should have received a copy of the GNU General Public License
* along with MjSip; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*
* Author(s):
* Luca Veltri (luca.veltri@unipr.it)
*/
package org.zoolu.tools;
/** Class Random collects some static methods for generating
* random numbers and other stuff.
*/
public class Random
{
/** The random seed */
static final long seed=System.currentTimeMillis();
//static final long seed=0;
static java.util.Random rand=new java.util.Random(seed);
//static java.util.Random rand=new java.util.Random();
/** Returns a random integer between 0 and n-1 */
/*static public int nextInt(int n)
{ seed=(seed*37)%987654321;
return (int)(seed%n);
}*/
/** Returns true or false respectively with probability p/100 and (1-p/100) */
/*static boolean percent(int p)
{ return integer(100)<p;
}*/
/** Sets the seed of this random number generator using a single long seed */
public static void setSeed(long seed)
{ rand.setSeed(seed);
}
/** Returns a random integer */
public static int nextInt()
{ return rand.nextInt();
}
/** Returns a random integer between 0 and n-1 */
public static int nextInt(int n)
{ return Math.abs(rand.nextInt())%n;
}
/** Returns a random long */
public static long nextLong()
{ return rand.nextLong();
}
/** Returns a random boolean */
public static boolean nextBoolean()
{ return rand.nextInt(2)==1;
}
/** Returns a random array of bytes */
public static byte[] nextBytes(int len)
{ byte[] buff=new byte[len];
for (int i=0; i<len; i++) buff[i]=(byte)nextInt(256);
return buff;
}
/** Returns a random String */
public static String nextString(int len)
{ byte[] buff=new byte[len];
for (int i=0; i<len; i++)
{ int n=nextInt(62);
buff[i]=(byte)((n<10)? 48+n : ((n<36)? 55+n : 61+n));
}
return new String(buff);
}
/** Returns a random numeric String */
public static String nextNumString(int len)
{ byte[] buff=new byte[len];
for (int i=0; i<len; i++) buff[i]=(byte)(48+nextInt(10));
return new String(buff);
}
/** Returns a random hexadecimal String */
public static String nextHexString(int len)
{ byte[] buff=new byte[len];
for (int i=0; i<len; i++)
{ int n=nextInt(16);
buff[i]=(byte)((n<10)? 48+n : 87+n);
}
return new String(buff);
}
}