/* Group.java -- Represents a group of Principals Copyright (C) 1998, 2001 Free Software Foundation, Inc. This file is part of GNU Classpath. GNU Classpath 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, or (at your option) any later version. GNU Classpath 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 GNU Classpath; see the file COPYING. If not, write to the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA. Linking this library statically or dynamically with other modules is making a combined work based on this library. Thus, the terms and conditions of the GNU General Public License cover the whole combination. As a special exception, the copyright holders of this library give you permission to link this library with independent modules to produce an executable, regardless of the license terms of these independent modules, and to copy and distribute the resulting executable under terms of your choice, provided that you also meet, for each linked independent module, the terms and conditions of the license of that module. An independent module is a module which is not derived from or based on this library. If you modify this library, you may extend this exception to your version of the library, but you are not obligated to do so. If you do not wish to do so, delete this exception statement from your version. */ package java.security.acl; import java.security.Principal; import java.util.Enumeration; /** * This interface represents a group of Principals. Note that * since this interface extends Principal, a Group * can be used where ever a Principal is requested. This * includes arguments to the methods in this interface. * * @version 0.0 * * @author Aaron M. Renn (arenn@urbanophile.com) */ public interface Group extends Principal { /** * This method adds a new Principal to this group. * * @param user The new Principal to add * * @return true if the user was successfully added or false if the user is already a member */ boolean addMember(Principal user); /** * This method deletes a member from the group. * * @param user The Principal to delete * * @return true if the user was successfully deleted or false if the user is not a member of the group */ boolean removeMember(Principal user); /** * This method tests whether or not a given Principal is a * member of this group. * * @param user The Principal to test for membership * * @return true if the user is member, false otherwise */ boolean isMember(Principal member); /** * This method returns a list of all members of the group as an * Enumeration. * * @return The list of all members of the group */ Enumeration members(); }
