/**
* Jin - a chess client for internet chess servers.
* More information is available at http://www.jinchess.com/.
* Copyright (C) 2003 Alexander Maryanovsky.
* All rights reserved.
*
* 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 free.jin;
/**
* Defines various username policies, such as which usernames are legal, whether
* they are case sensitive etc.
*/
public interface UsernamePolicy{
/**
* Returns whether the two specified usernames are considered to be the same.
*/
boolean isSame(String username1, String username2);
/**
* Given a username, returns a string describing a reason why it is invalid,
* or <code>null</code> if the username is valid.
*/
String invalidityReason(String username);
/**
* Returns the usual username used for logging in as guest.
*/
String getGuestUsername();
}
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