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| 1 | /* | ||
| 2 | * Copyright (c) 1996, 2011, 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 | package sun.security.acl; | ||
| 27 | |||
| 28 | import java.util.*; | ||
| 29 | import java.security.*; | ||
| 30 | import java.security.acl.*; | ||
| 31 | |||
| 32 | /** | ||
| 33 | * This class implements a group of principals. | ||
| 34 | * @author Satish Dharmaraj | ||
| 35 | */ | ||
| 36 | public class GroupImpl implements Group { | ||
| 37 | private Vector<Principal> groupMembers = new Vector<>(50, 100); | ||
| 38 | private String group; | ||
| 39 | |||
| 40 | /** | ||
| 41 | * Constructs a Group object with no members. | ||
| 42 | * @param groupName the name of the group | ||
| 43 | */ | ||
| 44 | public GroupImpl(String groupName) { | ||
| 45 | this.group = groupName; | ||
| 46 | } | ||
| 47 | |||
| 48 | /** | ||
| 49 | * adds the specified member to the group. | ||
| 50 | * @param user The principal to add to the group. | ||
| 51 | * @return true if the member was added - false if the | ||
| 52 | * member could not be added. | ||
| 53 | */ | ||
| 54 | public boolean addMember(Principal user) { | ||
| 55 | if (groupMembers.contains(user)) | ||
| 56 | return false; | ||
| 57 | |||
| 58 | // do not allow groups to be added to itself. | ||
| 59 | if (group.equals(user.toString())) | ||
| 60 | throw new IllegalArgumentException(); | ||
| 61 | |||
| 62 | groupMembers.addElement(user); | ||
| 63 | return true; | ||
| 64 | } | ||
| 65 | |||
| 66 | /** | ||
| 67 | * removes the specified member from the group. | ||
| 68 | * @param user The principal to remove from the group. | ||
| 69 | * @param true if the principal was removed false if | ||
| 70 | * the principal was not a member | ||
| 71 | */ | ||
| 72 | public boolean removeMember(Principal user) { | ||
| 73 | return groupMembers.removeElement(user); | ||
| 74 | } | ||
| 75 | |||
| 76 | /** | ||
| 77 | * returns the enumeration of the members in the group. | ||
| 78 | */ | ||
| 79 | public Enumeration<? extends Principal> members() { | ||
| 80 | return groupMembers.elements(); | ||
| 81 | } | ||
| 82 | |||
| 83 | /** | ||
| 84 | * This function returns true if the group passed matches | ||
| 85 | * the group represented in this interface. | ||
| 86 | * @param another The group to compare this group to. | ||
| 87 | */ | ||
| 88 | public boolean equals(Object obj) { | ||
| 89 | if (this == obj) { | ||
| 90 | return true; | ||
| 91 | } | ||
| 92 | if (obj instanceof Group == false) { | ||
| 93 | return false; | ||
| 94 | } | ||
| 95 | Group another = (Group)obj; | ||
| 96 | return group.equals(another.toString()); | ||
| 97 | } | ||
| 98 | |||
| 99 | // equals(Group) for compatibility | ||
| 100 | public boolean equals(Group another) { | ||
| 101 | return equals((Object)another); | ||
| 102 | } | ||
| 103 | |||
| 104 | /** | ||
| 105 | * Prints a stringified version of the group. | ||
| 106 | */ | ||
| 107 | public String toString() { | ||
| 108 | return group; | ||
| 109 | } | ||
| 110 | |||
| 111 | /** | ||
| 112 | * return a hashcode for the principal. | ||
| 113 | */ | ||
| 114 | public int hashCode() { | ||
| 115 | return group.hashCode(); | ||
| 116 | } | ||
| 117 | |||
| 118 | /** | ||
| 119 | * returns true if the passed principal is a member of the group. | ||
| 120 | * @param member The principal whose membership must be checked for. | ||
| 121 | * @return true if the principal is a member of this group, | ||
| 122 | * false otherwise | ||
| 123 | */ | ||
| 124 | public boolean isMember(Principal member) { | ||
| 125 | |||
| 126 | // | ||
| 127 | // if the member is part of the group (common case), return true. | ||
| 128 | // if not, recursively search depth first in the group looking for the | ||
| 129 | // principal. | ||
| 130 | // | ||
| 131 | if (groupMembers.contains(member)) { | ||
| 132 | return true; | ||
| 133 | } else { | ||
| 134 | Vector<Group> alreadySeen = new Vector<>(10); | ||
| 135 | return isMemberRecurse(member, alreadySeen); | ||
| 136 | } | ||
| 137 | } | ||
| 138 | |||
| 139 | /** | ||
| 140 | * return the name of the principal. | ||
| 141 | */ | ||
| 142 | public String getName() { | ||
| 143 | return group; | ||
| 144 | } | ||
| 145 | |||
| 146 | // | ||
| 147 | // This function is the recursive search of groups for this | ||
| 148 | // implementation of the Group. The search proceeds building up | ||
| 149 | // a vector of already seen groups. Only new groups are considered, | ||
| 150 | // thereby avoiding loops. | ||
| 151 | // | ||
| 152 | boolean isMemberRecurse(Principal member, Vector<Group> alreadySeen) { | ||
| 153 | Enumeration<? extends Principal> e = members(); | ||
| 154 | while (e.hasMoreElements()) { | ||
| 155 | boolean mem = false; | ||
| 156 | Principal p = (Principal) e.nextElement(); | ||
| 157 | |||
| 158 | // if the member is in this collection, return true | ||
| 159 | if (p.equals(member)) { | ||
| 160 | return true; | ||
| 161 | } else if (p instanceof GroupImpl) { | ||
| 162 | // | ||
| 163 | // if not recurse if the group has not been checked already. | ||
| 164 | // Can call method in this package only if the object is an | ||
| 165 | // instance of this class. Otherwise call the method defined | ||
| 166 | // in the interface. (This can lead to a loop if a mixture of | ||
| 167 | // implementations form a loop, but we live with this improbable | ||
| 168 | // case rather than clutter the interface by forcing the | ||
| 169 | // implementation of this method.) | ||
| 170 | // | ||
| 171 | GroupImpl g = (GroupImpl) p; | ||
| 172 | alreadySeen.addElement(this); | ||
| 173 | if (!alreadySeen.contains(g)) | ||
| 174 | mem = g.isMemberRecurse(member, alreadySeen); | ||
| 175 | } else if (p instanceof Group) { | ||
| 176 | Group g = (Group) p; | ||
| 177 | if (!alreadySeen.contains(g)) | ||
| 178 | mem = g.isMember(member); | ||
| 179 | } | ||
| 180 | |||
| 181 | if (mem) | ||
| 182 | return mem; | ||
| 183 | } | ||
| 184 | return false; | ||
| 185 | } | ||
| 186 | } | ||