88 lines
2.1 KiB
88 lines
2.1 KiB
/*
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* Copyright (c) 1996, 2013, Oracle and/or its affiliates. All rights reserved.
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* ORACLE PROPRIETARY/CONFIDENTIAL. Use is subject to license terms.
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*
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*
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*
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*
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*
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*
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*
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*
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*
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*
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*
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*
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*
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*
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*
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*
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*
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*
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*
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*
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*/
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package java.security.acl;
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import java.util.Enumeration;
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import java.security.Principal;
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/**
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* This interface is used to represent a group of principals. (A principal
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* represents an entity such as an individual user or a company). <p>
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*
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* Note that Group extends Principal. Thus, either a Principal or a Group can
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* be passed as an argument to methods containing a Principal parameter. For
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* example, you can add either a Principal or a Group to a Group object by
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* calling the object's {@code addMember} method, passing it the
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* Principal or Group.
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*
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* @author Satish Dharmaraj
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*/
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public interface Group extends Principal {
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/**
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* Adds the specified member to the group.
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*
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* @param user the principal to add to this group.
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*
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* @return true if the member was successfully added,
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* false if the principal was already a member.
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*/
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public boolean addMember(Principal user);
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/**
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* Removes the specified member from the group.
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*
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* @param user the principal to remove from this group.
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*
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* @return true if the principal was removed, or
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* false if the principal was not a member.
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*/
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public boolean removeMember(Principal user);
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/**
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* Returns true if the passed principal is a member of the group.
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* This method does a recursive search, so if a principal belongs to a
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* group which is a member of this group, true is returned.
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*
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* @param member the principal whose membership is to be checked.
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*
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* @return true if the principal is a member of this group,
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* false otherwise.
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*/
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public boolean isMember(Principal member);
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/**
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* Returns an enumeration of the members in the group.
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* The returned objects can be instances of either Principal
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* or Group (which is a subclass of Principal).
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*
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* @return an enumeration of the group members.
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*/
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public Enumeration<? extends Principal> members();
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}
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