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91 lines
3.3 KiB
Java
91 lines
3.3 KiB
Java
/* Group.java -- Represents a group of Principals
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Copyright (C) 1998, 2001 Free Software Foundation, Inc.
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This file is part of GNU Classpath.
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GNU Classpath is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 2, or (at your option)
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any later version.
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GNU Classpath is distributed in the hope that it will be useful, but
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WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with GNU Classpath; see the file COPYING. If not, write to the
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Free Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
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02111-1307 USA.
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Linking this library statically or dynamically with other modules is
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making a combined work based on this library. Thus, the terms and
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conditions of the GNU General Public License cover the whole
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combination.
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As a special exception, the copyright holders of this library give you
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permission to link this library with independent modules to produce an
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executable, regardless of the license terms of these independent
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modules, and to copy and distribute the resulting executable under
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terms of your choice, provided that you also meet, for each linked
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independent module, the terms and conditions of the license of that
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module. An independent module is a module which is not derived from
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or based on this library. If you modify this library, you may extend
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this exception to your version of the library, but you are not
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obligated to do so. If you do not wish to do so, delete this
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exception statement from your version. */
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package java.security.acl;
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import java.security.Principal;
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import java.util.Enumeration;
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/**
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* This interface represents a group of <code>Principals</code>. Note that
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* since this interface extends <code>Principal</code>, a <code>Group</code>
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* can be used where ever a <code>Principal</code> is requested. This
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* includes arguments to the methods in this interface.
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*
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* @version 0.0
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*
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* @author Aaron M. Renn (arenn@urbanophile.com)
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*/
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public interface Group extends Principal
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{
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/**
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* This method adds a new <code>Principal</code> to this group.
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*
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* @param user The new <code>Principal</code> to add
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*
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* @return <code>true</code> if the user was successfully added or <code>false</code> if the user is already a member
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*/
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public abstract boolean addMember(Principal user);
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/**
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* This method deletes a member from the group.
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*
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* @param user The <code>Principal</code> to delete
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*
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* @return <code>true</code> if the user was successfully deleted or <code>false</code> if the user is not a member of the group
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*/
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public abstract boolean removeMember(Principal user);
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/**
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* This method tests whether or not a given <code>Principal</code> is a
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* member of this group.
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*
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* @param user The <code>Principal</code> to test for membership
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*
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* @return <code>true</code> if the user is member, <code>false</code> otherwise
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*/
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public abstract boolean isMember(Principal member);
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/**
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* This method returns a list of all members of the group as an
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* <code>Enumeration</code>.
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*
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* @return The list of all members of the group
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*/
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public abstract Enumeration members();
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}
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