org.cybergarage.round.ConsistentHash.java Source code

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Here is the source code for org.cybergarage.round.ConsistentHash.java

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/******************************************************************
*
* Round for Java
*
* Copyright (C) Satoshi Konno 2015
*
* This is licensed under BSD-style license, see file COPYING.
*
******************************************************************/

package org.cybergarage.round;

import java.net.*;
import java.io.*;
import org.json.*;
import java.util.HashMap;
import java.security.MessageDigest;
import java.io.ByteArrayOutputStream;

import org.cybergarage.round.rpc.*;

public class ConsistentHash {
    public final static String GetHashCode(String seed) {
        try {
            MessageDigest md = MessageDigest.getInstance("SHA-256");
            md.update(seed.getBytes());
            byte[] digest = md.digest();

            ByteArrayOutputStream buffer = new ByteArrayOutputStream();
            PrintStream ps = new PrintStream(buffer);
            for (int i = 0; i < digest.length; i++) {
                ps.printf("%02x", (digest[i] & 0xff));
            }
            return buffer.toString();
        } catch (java.security.NoSuchAlgorithmException e) {
            return "";
        }
    }
}