RandomOrgSeededRandomGenerator.java Source code

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Here is the source code for RandomOrgSeededRandomGenerator.java

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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;
    }
}