J. Duke | 319a3b9 | 2007-12-01 00:00:00 +0000 | [diff] [blame^] | 1 | /* |
| 2 | * Copyright 1996-2006 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 | package sun.security.acl; |
| 27 | |
| 28 | import java.util.*; |
| 29 | import java.security.*; |
| 30 | import java.security.acl.*; |
| 31 | |
| 32 | /** |
| 33 | * Class implementing the Owner interface. The |
| 34 | * initial owner principal is configured as |
| 35 | * part of the constructor. |
| 36 | * @author Satish Dharmaraj |
| 37 | */ |
| 38 | public class OwnerImpl implements Owner { |
| 39 | private Group ownerGroup; |
| 40 | |
| 41 | public OwnerImpl(Principal owner) { |
| 42 | ownerGroup = new GroupImpl("AclOwners"); |
| 43 | ownerGroup.addMember(owner); |
| 44 | } |
| 45 | |
| 46 | /** |
| 47 | * Adds an owner. Owners can modify ACL contents and can disassociate |
| 48 | * ACLs from the objects they protect in the AclConfig interface. |
| 49 | * The caller principal must be a part of the owners list of the ACL in |
| 50 | * order to invoke this method. The initial owner is configured |
| 51 | * at ACL construction time. |
| 52 | * @param caller the principal who is invoking this method. |
| 53 | * @param owner The owner that should be added to the owners list. |
| 54 | * @return true if success, false if already an owner. |
| 55 | * @exception NotOwnerException if the caller principal is not on |
| 56 | * the owners list of the Acl. |
| 57 | */ |
| 58 | public synchronized boolean addOwner(Principal caller, Principal owner) |
| 59 | throws NotOwnerException |
| 60 | { |
| 61 | if (!isOwner(caller)) |
| 62 | throw new NotOwnerException(); |
| 63 | |
| 64 | ownerGroup.addMember(owner); |
| 65 | return false; |
| 66 | } |
| 67 | |
| 68 | /** |
| 69 | * Delete owner. If this is the last owner in the ACL, an exception is |
| 70 | * raised. |
| 71 | * The caller principal must be a part of the owners list of the ACL in |
| 72 | * order to invoke this method. |
| 73 | * @param caller the principal who is invoking this method. |
| 74 | * @param owner The owner to be removed from the owners list. |
| 75 | * @return true if the owner is removed, false if the owner is not part |
| 76 | * of the owners list. |
| 77 | * @exception NotOwnerException if the caller principal is not on |
| 78 | * the owners list of the Acl. |
| 79 | * @exception LastOwnerException if there is only one owner left in the group, then |
| 80 | * deleteOwner would leave the ACL owner-less. This exception is raised in such a case. |
| 81 | */ |
| 82 | public synchronized boolean deleteOwner(Principal caller, Principal owner) |
| 83 | throws NotOwnerException, LastOwnerException |
| 84 | { |
| 85 | if (!isOwner(caller)) |
| 86 | throw new NotOwnerException(); |
| 87 | |
| 88 | Enumeration<? extends Principal> e = ownerGroup.members(); |
| 89 | // |
| 90 | // check if there is atleast 2 members left. |
| 91 | // |
| 92 | Object o = e.nextElement(); |
| 93 | if (e.hasMoreElements()) |
| 94 | return ownerGroup.removeMember(owner); |
| 95 | else |
| 96 | throw new LastOwnerException(); |
| 97 | |
| 98 | } |
| 99 | |
| 100 | /** |
| 101 | * returns if the given principal belongs to the owner list. |
| 102 | * @param owner The owner to check if part of the owners list |
| 103 | * @return true if the passed principal is in the owner list, false if not. |
| 104 | */ |
| 105 | public synchronized boolean isOwner(Principal owner) { |
| 106 | return ownerGroup.isMember(owner); |
| 107 | } |
| 108 | } |