J. Duke | 319a3b9 | 2007-12-01 00:00:00 +0000 | [diff] [blame^] | 1 | /* |
| 2 | * Copyright 1997-2007 Sun Microsystems, Inc. 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. Sun designates this |
| 8 | * particular file as subject to the "Classpath" exception as provided |
| 9 | * by Sun 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 Sun Microsystems, Inc., 4150 Network Circle, Santa Clara, |
| 22 | * CA 95054 USA or visit www.sun.com if you need additional information or |
| 23 | * have any 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 | } |