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 }