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Java Source | 1998-03-20 | 2.4 KB | 77 lines |
- /*
- * @(#)Group.java 1.12 98/03/18
- *
- * Copyright 1996, 1997 by Sun Microsystems, Inc.,
- * 901 San Antonio Road, Palo Alto, California, 94303, U.S.A.
- * All rights reserved.
- *
- * This software is the confidential and proprietary information
- * of Sun Microsystems, Inc. ("Confidential Information"). You
- * shall not disclose such Confidential Information and shall use
- * it only in accordance with the terms of the license agreement
- * you entered into with Sun.
- */
-
- package java.security.acl;
-
- import java.util.Enumeration;
- import java.security.Principal;
-
- /**
- * This interface is used to represent a group of principals. (A principal
- * represents an entity such as an individual user or a company). <p>
- *
- * Note that Group extends Principal. Thus, either a Principal or a Group can
- * be passed as an argument to methods containing a Principal parameter. For
- * example, you can add either a Principal or a Group to a Group object by
- * calling the object's <code>addMember</code> method, passing it the
- * Principal or Group.
- *
- * @author Satish Dharmaraj
- */
- public interface Group extends Principal {
-
- /**
- * Adds the specified member to the group.
- *
- * @param user the principal to add to this group.
- *
- * @return true if the member was successfully added,
- * false if the principal was already a member.
- */
- public boolean addMember(Principal user);
-
- /**
- * Removes the specified member from the group.
- *
- * @param user the principal to remove from this group.
- *
- * @return true if the principal was removed, or
- * false if the principal was not a member.
- */
- public boolean removeMember(Principal user);
-
- /**
- * Returns true if the passed principal is a member of the group.
- * This method does a recursive search, so if a principal belongs to a
- * group which is a member of this group, true is returned.
- *
- * @param member the principal whose membership is to be checked.
- *
- * @return true if the principal is a member of this group,
- * false otherwise.
- */
- public boolean isMember(Principal member);
-
-
- /**
- * Returns an enumeration of the members in the group.
- * The returned objects can be instances of either Principal
- * or Group (which is a subclass of Principal).
- *
- * @return an enumeration of the group members.
- */
- public Enumeration members();
-
- }
-