Mega Code Archive
A random org seeded random generator
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/**
* 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.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
*/
//package org.cspoker.common.util.random;
import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;
import java.net.MalformedURLException;
import java.net.URL;
import java.net.URLConnection;
import java.security.SecureRandom;
import java.util.Random;
//import org.apache.log4j.Logger;
/**
* A random.org seeded random generator.
*
* @author Kenzo
*
*/
public class RandomOrgSeededRandomGenerator implements RandomSource {
//private static Logger logger = Logger
// .getLogger(RandomOrgSeededRandomGenerator.class);
private static RandomOrgSeededRandomGenerator instance = new RandomOrgSeededRandomGenerator();
private Random random;
/**
* Construct a new random.org seeded random generator.
*
*/
private RandomOrgSeededRandomGenerator() {
try {
final URL url = new URL(
"http://www.random.org/strings/?num=10&len=10&digits=on&unique=on&format=plain&rnd=new");
URLConnection connection = url.openConnection();
connection.setConnectTimeout(5000);
final BufferedReader in = new BufferedReader(new InputStreamReader(
connection.getInputStream()));
final StringBuilder stringBuilder = new StringBuilder();
String line;
while ((line = in.readLine()) != null) {
stringBuilder.append(line);
}
in.close();
final byte[] seed = stringBuilder.toString().getBytes();
random = new SecureRandom(seed);
} catch (final MalformedURLException e) {
//logger.info("Default secure random is used.");
random = new SecureRandom();
} catch (final IOException e) {
//logger.info("Default secure random is used.");
random = new SecureRandom();
}
}
public static RandomOrgSeededRandomGenerator getInstance() {
return RandomOrgSeededRandomGenerator.instance;
}
/**
* Returns a random-object.
*
* The default implementation uses the current time as seed.
*
* @return A random-object.
*/
public Random getRandom() {
return random;
}
}
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