package org.litesoft.p2pchat;

import java.net.*;

// Copyright Status:
//
// All Software available from LiteSoft.org (including this file) is
// hereby released into the public domain.
//
// It is free!  As in, you may use it freely in both commercial and
// non-commercial applications, bundle it with your software
// distribution, include it on a CD-ROM, list the source code in a book,
// mirror the documentation at your own web site, or use it in any other
// way you see fit.
//
// NO Warranty!
//
// All software is provided "as is".
//
// There is ABSOLUTELY NO WARRANTY OF ANY KIND: not for the design, fitness
// (for a particular purpose), level of errors (or lack thereof), or
// applicability of this software.  The entire risk as to the quality
// and performance of this software is with you.  Should this software
// prove defective, you assume the cost of all necessary servicing, repair
// or correction.
//
// In no event unless required by applicable law or agreed to in writing
// will any party who created or may modify and/or redistribute this
// software, be liable to you for damages, including any general,
// special, incidental or consequential damages arising out of the use or
// inability to use this software (including but not limited to loss of
// data or data being rendered inaccurate or losses sustained by you or
// third parties or a failure of this software to operate with any
// other programs), even if such holder or other party has been advised
// of the possibility of such damages.
//
// NOTE: Should you discover a bug, have a recogmendation for a change, wish
// to submit modifications, or wish to add new classes/functionality,
// please email them to:
//
//        changes@litesoft.org
//

/**
 * @author  George Smith
 * @version 0.3 02/02/02 Added IllegalArgument.ifNull for all public params that may not be null
 * @version 0.2 01/28/02 Refactored and Added Licence
 * @version 0.1 12/27/01 Incorporated into p2pchat
 * @version 0.0 --/--/98 Initial Version
 */
public class ThisMachine {
  private ThisMachine() {
  }          // private Constructor!

  private static InetAddress[] OurInetAddresses;

  public static String getName() {
    if (!FetchOurInetAddresses())
      return "";

    return OurInetAddresses[0].getHostName();
  }

  public static String getIPAddress(int IPindex) {
    return getIPAddress(getNthAddress(IPindex));
  }

  public static String getIPAddress(byte[] address) {
    if (address == null) {
      return null;
    }
    String z = "";
    for (int j = 0; j < address.length; j++)
      z += "." + (((int) address[j]) & 255);
    return z.substring(1);
  }

  private static byte[] getNthAddress(int IPindex) {
    if (FetchOurInetAddresses())
      if ((0 <= IPindex) && (IPindex < OurInetAddresses.length))
        return OurInetAddresses[IPindex].getAddress();
    return null;
  }

  private static synchronized boolean FetchOurInetAddresses() {
    if (OurInetAddresses != null)
      return true;

    try {
      OurInetAddresses = InetAddress.getAllByName(InetAddress.getLocalHost().getHostName());
    }
    catch (UnknownHostException e) {
      OurInetAddresses = null;
    }

    return (OurInetAddresses != null);
  }
}