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[/] [openrisc/] [trunk/] [gnu-dev/] [or1k-gcc/] [libjava/] [classpath/] [java/] [security/] [acl/] [AclEntry.java] - Blame information for rev 791

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1 771 jeremybenn
/* AclEntry.java -- An entry in an ACL list.
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   Copyright (C) 1998 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., 51 Franklin Street, Fifth Floor, Boston, MA
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02110-1301 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 models an entry in an access control list (ACL).  Java
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 * ACL's consist of a list of entries, where each consists of a
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 * <code>Principal</code> and a list of <code>Permission</code>'s which
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 * have been granted to that <code>Principal</code>.  An ACL can also
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 * be <em>negative</em>, which indicates that the list of
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 * <code>Permission</code>'s is a list of permissions that are <em>not</em>
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 * granted to the <code>Principal</code>.  A <code>Principal</code> can
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 * have at most one regular (or positive) ACL entry and one negative
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 * ACL entry.
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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 AclEntry extends Cloneable
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{
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 /**
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   * This method returns the <code>Principal</code> associated with this
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   * ACL entry.
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   *
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   * @return The <code>Principal</code> for this ACL entry
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   */
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  Principal getPrincipal();
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  /**
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   * This method sets ths <code>Principal</code> associated with this
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   * ACL entry.  This operation will only succeed if there is not already
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   * a <code>Principal</code> assigned.
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   *
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   * @param user The <code>Principal</code> for this ACL entry
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   *
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   * @return <code>true</code> if the <code>Principal</code> was successfully set or <code>false</code> if this entry already has a <code>Principal</code>.
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   */
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  boolean setPrincipal(Principal user);
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  /**
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   * This method sets this ACL entry to be a <em>negative</em> entry, indicating
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   * that it contains a list of permissions that are <em>not</em> granted
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   * to the entry's <code>Principal</code>.  Note that there is no way to
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   * undo this operation.
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   */
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  void setNegativePermissions();
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  /**
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   * This method tests whether or not this ACL entry is a negative entry or not.
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   *
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   * @return <code>true</code> if this ACL entry is negative, <code>false</code> otherwise
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   */
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  boolean isNegative();
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  /**
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   * This method adds the specified permission to this ACL entry.
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   *
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   * @param permission The <code>Permission</code> to add
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   *
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   * @return <code>true</code> if the permission was added or <code>false</code> if it was already set for this entry
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   */
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  boolean addPermission(Permission permission);
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  /**
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   * This method deletes the specified permission to this ACL entry.
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   *
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   * @param perm The <code>Permission</code> to delete from this ACL entry.
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   *
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   * @return <code>true</code> if the permission was successfully deleted or <code>false</code> if the permission was not part of this ACL to begin with
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   */
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  boolean removePermission(Permission perm);
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  /**
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   * This method tests whether or not the specified permission is associated
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   * with this ACL entry.
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   *
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   * @param permission The <code>Permission</code> to test
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   *
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   * @return <code>true</code> if this permission is associated with this entry or <code>false</code> otherwise
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   */
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  boolean checkPermission(Permission permission);
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  /**
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   * This method returns a list of all <code>Permission</code> objects
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   * associated with this ACL entry as an <code>Enumeration</code>.
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   *
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   * @return A list of permissions for this ACL entry
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   */
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  Enumeration<Permission> permissions();
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  /**
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   * This method returns this object as a <code>String</code>.
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   *
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   * @return A <code>String</code> representation of this object
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   */
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  String toString();
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  /**
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   * This method returns a clone of this ACL entry
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   *
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   * @return A clone of this ACL entry
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   */
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  Object clone();
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}

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