1 /*

     2  * Copyright (c) 1997, 2007, Oracle and/or its affiliates. All rights reserved.

     3  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.

     4  *

     5  * This code is free software; you can redistribute it and/or modify it

     6  * under the terms of the GNU General Public License version 2 only, as

     7  * published by the Free Software Foundation.  Oracle designates this

     8  * particular file as subject to the "Classpath" exception as provided

     9  * by Oracle in the LICENSE file that accompanied this code.

    10  *

    11  * This code is distributed in the hope that it will be useful, but WITHOUT

    12  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or

    13  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License

    14  * version 2 for more details (a copy is included in the LICENSE file that

    15  * accompanied this code).

    16  *

    17  * You should have received a copy of the GNU General Public License version

    18  * 2 along with this work; if not, write to the Free Software Foundation,

    19  * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.

    20  *

    21  * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA

    22  * or visit www.oracle.com if you need additional information or have any

    23  * questions.

    24  */

    25 

    26 

    27 package com.sun.jmx.snmp.IPAcl;

    28 

    29 

    30 

    31 import java.util.Vector;

    32 import java.io.Serializable;

    33 

    34 import java.security.Principal;

    35 import java.security.acl.Owner;

    36 import java.security.acl.LastOwnerException;

    37 import java.security.acl.NotOwnerException;

    38 

    39 

    40 /**

    41  * Owner of Access Control Lists (ACLs).

    42  * The initial owner Principal should be specified as an

    43  * argument to the constructor of the class AclImpl.

    44  *

    45  * @see java.security.acl.Owner

    46  */

    47 

    48 class OwnerImpl implements Owner, Serializable {

    49   private static final long serialVersionUID = -576066072046319874L;

    50 

    51   private Vector<Principal> ownerList = null;

    52 

    53   /**

    54    * Constructs an empty list of owner.

    55    */

    56   public OwnerImpl (){

    57         ownerList = new Vector<Principal>();

    58   }

    59 

    60   /**

    61    * Constructs a list of owner with the specified principal as first element.

    62    *

    63    * @param owner the principal added to the owner list.

    64    */

    65   public OwnerImpl (PrincipalImpl owner){

    66         ownerList = new Vector<Principal>();

    67         ownerList.addElement(owner);

    68   }

    69 

    70   /**

    71    * Adds an owner. Only owners can modify ACL contents. The caller principal

    72    * must be an owner of the ACL in order to invoke this method. That is, only

    73    * an owner can add another owner. The initial owner is configured at

    74    * ACL construction time.

    75    *

    76    * @param caller the principal invoking this method.

    77    *        It must be an owner of the ACL.

    78    * @param owner the owner that should be added to the list of owners.

    79    * @return true if successful, false if owner is already an owner.

    80    * @exception NotOwnerException if the caller principal is not an owner

    81    *    of the ACL.

    82    */

    83   public boolean addOwner(Principal caller, Principal owner)

    84         throws NotOwnerException {

    85         if (!ownerList.contains(caller))

    86           throw new NotOwnerException();

    87 

    88         if (ownerList.contains(owner)) {

    89           return false;

    90         } else {

    91           ownerList.addElement(owner);

    92           return true;

    93         }

    94   }

    95 

    96   /**

    97    * Deletes an owner. If this is the last owner in the ACL, an exception is raised.

    98    *<P>

    99    * The caller principal must be an owner of the ACL in order to invoke this method.

   100    *

   101    * @param caller the principal invoking this method. It must be an owner

   102    *   of the ACL.

   103    * @param owner the owner to be removed from the list of owners.

   104    * @return true if successful, false if owner is already an owner.

   105    * @exception NotOwnerException if the caller principal is not an owner

   106    *   of the ACL.

   107    * @exception LastOwnerException if there is only one owner left, so that

   108    *   deleteOwner would leave the ACL owner-less.

   109    */

   110   public boolean deleteOwner(Principal caller, Principal owner)

   111                 throws NotOwnerException,LastOwnerException {

   112 

   113         if (!ownerList.contains(caller))

   114           throw new NotOwnerException();

   115 

   116         if (!ownerList.contains(owner)){

   117           return false;

   118         } else {

   119           if (ownerList.size() == 1)

   120                 throw new LastOwnerException();

   121 

   122           ownerList.removeElement(owner);

   123           return true;

   124         }

   125   }

   126 

   127   /**

   128    * Returns true if the given principal is an owner of the ACL.

   129    *

   130    * @param owner the principal to be checked to determine whether or

   131    *        not it is an owner.

   132    * @return true if the given principal is an owner of the ACL.

   133    */

   134   public boolean isOwner(Principal owner){

   135         return ownerList.contains(owner);

   136   }

   137 }