/*

  * Copyright (c) 2003-2008, by Henrik Arro and Contributors

  *

  * This file is part of JSeq, a tool to automatically create

  * sequence diagrams by tracing program execution.

  *

  * See <http://jseq.sourceforge.net> for more information.

  *

  * JSeq is free software: you can redistribute it and/or modify

  * it under the terms of the GNU Lesser General Public License as

  * published by the Free Software Foundation, either version 3 of

  * the License, or (at your option) any later version.

  *

  * JSeq 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 Lesser General Public License for more details.

  *

  * You should have received a copy of the GNU Lesser General Public License

  * along with JSeq. If not, see <http://www.gnu.org/licenses/>.

  */

 package th.co.edge.jseq.argouml;

 import java.net.InetAddress;

 import java.net.UnknownHostException;

 import java.rmi.server.UID;

 /**

  * A <code>UUID</code> is a utility class that is used to generate "globally"

  * unique identifiers.

  *

  * <p>

  * The algorithm uses the IP address of the machine running the code as part of

  * the identifier, so an external address needs to be available to make the

  * numbers really unique.

  */

 public class UUID {

     private static String address = "";

     /**

      * Since this is a utility class containing only static methods, we hide the

      * only constructor.

      */

     private UUID() {

     }

     static {

         try {

             InetAddress inetAddress = InetAddress.getLocalHost();

             byte[] bytes = inetAddress.getAddress();

             StringBuffer sb = new StringBuffer();

             for (int i = 0; i < bytes.length; i++) {

                 Byte b = new Byte(bytes[i]);

                 sb.append(b.longValue() + "-");

             }

             address = sb.toString();

         } catch (UnknownHostException e) {

             System.err.println(e);

         }

     }

     /**

      * Returns a globally unique identifier.

      *

      * @return a globally unique identifier

      */

     public static String getID() {

         UID uid = new UID();

         return address + uid;

     }

 }