1 /* |
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2 * Copyright (c) 1996, 2006, Oracle and/or its affiliates. All rights reserved. |
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3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
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4 * |
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5 * This code is free software; you can redistribute it and/or modify it |
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6 * under the terms of the GNU General Public License version 2 only, as |
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7 * published by the Free Software Foundation. Oracle designates this |
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8 * particular file as subject to the "Classpath" exception as provided |
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9 * by Oracle in the LICENSE file that accompanied this code. |
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10 * |
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11 * This code is distributed in the hope that it will be useful, but WITHOUT |
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12 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or |
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13 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License |
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14 * version 2 for more details (a copy is included in the LICENSE file that |
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15 * accompanied this code). |
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16 * |
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17 * You should have received a copy of the GNU General Public License version |
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18 * 2 along with this work; if not, write to the Free Software Foundation, |
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19 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. |
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20 * |
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21 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
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22 * or visit www.oracle.com if you need additional information or have any |
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23 * questions. |
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24 */ |
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25 |
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26 package sun.security.acl; |
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27 |
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28 import java.util.*; |
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29 import java.security.*; |
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30 import java.security.acl.*; |
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31 |
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32 /** |
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33 * Class implementing the Owner interface. The |
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34 * initial owner principal is configured as |
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35 * part of the constructor. |
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36 * @author Satish Dharmaraj |
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37 */ |
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38 public class OwnerImpl implements Owner { |
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39 private Group ownerGroup; |
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40 |
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41 public OwnerImpl(Principal owner) { |
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42 ownerGroup = new GroupImpl("AclOwners"); |
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43 ownerGroup.addMember(owner); |
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44 } |
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45 |
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46 /** |
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47 * Adds an owner. Owners can modify ACL contents and can disassociate |
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48 * ACLs from the objects they protect in the AclConfig interface. |
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49 * The caller principal must be a part of the owners list of the ACL in |
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50 * order to invoke this method. The initial owner is configured |
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51 * at ACL construction time. |
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52 * @param caller the principal who is invoking this method. |
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53 * @param owner The owner that should be added to the owners list. |
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54 * @return true if success, false if already an owner. |
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55 * @exception NotOwnerException if the caller principal is not on |
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56 * the owners list of the Acl. |
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57 */ |
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58 public synchronized boolean addOwner(Principal caller, Principal owner) |
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59 throws NotOwnerException |
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60 { |
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61 if (!isOwner(caller)) |
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62 throw new NotOwnerException(); |
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63 |
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64 ownerGroup.addMember(owner); |
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65 return false; |
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66 } |
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67 |
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68 /** |
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69 * Delete owner. If this is the last owner in the ACL, an exception is |
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70 * raised. |
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71 * The caller principal must be a part of the owners list of the ACL in |
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72 * order to invoke this method. |
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73 * @param caller the principal who is invoking this method. |
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74 * @param owner The owner to be removed from the owners list. |
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75 * @return true if the owner is removed, false if the owner is not part |
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76 * of the owners list. |
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77 * @exception NotOwnerException if the caller principal is not on |
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78 * the owners list of the Acl. |
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79 * @exception LastOwnerException if there is only one owner left in the group, then |
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80 * deleteOwner would leave the ACL owner-less. This exception is raised in such a case. |
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81 */ |
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82 public synchronized boolean deleteOwner(Principal caller, Principal owner) |
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83 throws NotOwnerException, LastOwnerException |
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84 { |
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85 if (!isOwner(caller)) |
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86 throw new NotOwnerException(); |
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87 |
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88 Enumeration<? extends Principal> e = ownerGroup.members(); |
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89 // |
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90 // check if there is atleast 2 members left. |
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91 // |
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92 Object o = e.nextElement(); |
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93 if (e.hasMoreElements()) |
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94 return ownerGroup.removeMember(owner); |
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95 else |
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96 throw new LastOwnerException(); |
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97 |
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98 } |
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99 |
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100 /** |
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101 * returns if the given principal belongs to the owner list. |
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102 * @param owner The owner to check if part of the owners list |
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103 * @return true if the passed principal is in the owner list, false if not. |
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104 */ |
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105 public synchronized boolean isOwner(Principal owner) { |
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106 return ownerGroup.isMember(owner); |
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107 } |
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108 } |
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