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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 | +} | |