| /* |
| * Copyright (c) 1996, 2011, Oracle and/or its affiliates. All rights reserved. |
| * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
| * |
| * This code is free software; you can redistribute it and/or modify it |
| * under the terms of the GNU General Public License version 2 only, as |
| * published by the Free Software Foundation. Oracle designates this |
| * particular file as subject to the "Classpath" exception as provided |
| * by Oracle in the LICENSE file that accompanied this code. |
| * |
| * This code is distributed in the hope that it will be useful, but WITHOUT |
| * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or |
| * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License |
| * version 2 for more details (a copy is included in the LICENSE file that |
| * accompanied this code). |
| * |
| * You should have received a copy of the GNU General Public License version |
| * 2 along with this work; if not, write to the Free Software Foundation, |
| * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. |
| * |
| * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
| * or visit www.oracle.com if you need additional information or have any |
| * questions. |
| */ |
| |
| package sun.security.acl; |
| |
| import java.util.*; |
| import java.security.*; |
| import java.security.acl.*; |
| |
| /** |
| * This class implements a group of principals. |
| * @author Satish Dharmaraj |
| */ |
| public class GroupImpl implements Group { |
| private Vector<Principal> groupMembers = new Vector<>(50, 100); |
| private String group; |
| |
| /** |
| * Constructs a Group object with no members. |
| * @param groupName the name of the group |
| */ |
| public GroupImpl(String groupName) { |
| this.group = groupName; |
| } |
| |
| /** |
| * adds the specified member to the group. |
| * @param user The principal to add to the group. |
| * @return true if the member was added - false if the |
| * member could not be added. |
| */ |
| public boolean addMember(Principal user) { |
| if (groupMembers.contains(user)) |
| return false; |
| |
| // do not allow groups to be added to itself. |
| if (group.equals(user.toString())) |
| throw new IllegalArgumentException(); |
| |
| groupMembers.addElement(user); |
| return true; |
| } |
| |
| /** |
| * removes the specified member from the group. |
| * @param user The principal to remove from the group. |
| * @param true if the principal was removed false if |
| * the principal was not a member |
| */ |
| public boolean removeMember(Principal user) { |
| return groupMembers.removeElement(user); |
| } |
| |
| /** |
| * returns the enumeration of the members in the group. |
| */ |
| public Enumeration<? extends Principal> members() { |
| return groupMembers.elements(); |
| } |
| |
| /** |
| * This function returns true if the group passed matches |
| * the group represented in this interface. |
| * @param another The group to compare this group to. |
| */ |
| public boolean equals(Object obj) { |
| if (this == obj) { |
| return true; |
| } |
| if (obj instanceof Group == false) { |
| return false; |
| } |
| Group another = (Group)obj; |
| return group.equals(another.toString()); |
| } |
| |
| // equals(Group) for compatibility |
| public boolean equals(Group another) { |
| return equals((Object)another); |
| } |
| |
| /** |
| * Prints a stringified version of the group. |
| */ |
| public String toString() { |
| return group; |
| } |
| |
| /** |
| * return a hashcode for the principal. |
| */ |
| public int hashCode() { |
| return group.hashCode(); |
| } |
| |
| /** |
| * returns true if the passed principal is a member of the group. |
| * @param member The principal whose membership must be checked for. |
| * @return true if the principal is a member of this group, |
| * false otherwise |
| */ |
| public boolean isMember(Principal member) { |
| |
| // |
| // if the member is part of the group (common case), return true. |
| // if not, recursively search depth first in the group looking for the |
| // principal. |
| // |
| if (groupMembers.contains(member)) { |
| return true; |
| } else { |
| Vector<Group> alreadySeen = new Vector<>(10); |
| return isMemberRecurse(member, alreadySeen); |
| } |
| } |
| |
| /** |
| * return the name of the principal. |
| */ |
| public String getName() { |
| return group; |
| } |
| |
| // |
| // This function is the recursive search of groups for this |
| // implementation of the Group. The search proceeds building up |
| // a vector of already seen groups. Only new groups are considered, |
| // thereby avoiding loops. |
| // |
| boolean isMemberRecurse(Principal member, Vector<Group> alreadySeen) { |
| Enumeration<? extends Principal> e = members(); |
| while (e.hasMoreElements()) { |
| boolean mem = false; |
| Principal p = (Principal) e.nextElement(); |
| |
| // if the member is in this collection, return true |
| if (p.equals(member)) { |
| return true; |
| } else if (p instanceof GroupImpl) { |
| // |
| // if not recurse if the group has not been checked already. |
| // Can call method in this package only if the object is an |
| // instance of this class. Otherwise call the method defined |
| // in the interface. (This can lead to a loop if a mixture of |
| // implementations form a loop, but we live with this improbable |
| // case rather than clutter the interface by forcing the |
| // implementation of this method.) |
| // |
| GroupImpl g = (GroupImpl) p; |
| alreadySeen.addElement(this); |
| if (!alreadySeen.contains(g)) |
| mem = g.isMemberRecurse(member, alreadySeen); |
| } else if (p instanceof Group) { |
| Group g = (Group) p; |
| if (!alreadySeen.contains(g)) |
| mem = g.isMember(member); |
| } |
| |
| if (mem) |
| return mem; |
| } |
| return false; |
| } |
| } |