| /* |
| * 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.Principal; |
| import java.security.acl.*; |
| |
| /** |
| * This is a class that describes one entry that associates users |
| * or groups with permissions in the ACL. |
| * The entry may be used as a way of granting or denying permissions. |
| * @author Satish Dharmaraj |
| */ |
| public class AclEntryImpl implements AclEntry { |
| private Principal user = null; |
| private Vector<Permission> permissionSet = new Vector<>(10, 10); |
| private boolean negative = false; |
| |
| /** |
| * Construct an ACL entry that associates a user with permissions |
| * in the ACL. |
| * @param user The user that is associated with this entry. |
| */ |
| public AclEntryImpl(Principal user) { |
| this.user = user; |
| } |
| |
| /** |
| * Construct a null ACL entry |
| */ |
| public AclEntryImpl() { |
| } |
| |
| /** |
| * Sets the principal in the entity. If a group or a |
| * principal had already been set, a false value is |
| * returned, otherwise a true value is returned. |
| * @param user The user that is associated with this entry. |
| * @return true if the principal is set, false if there is |
| * one already. |
| */ |
| public boolean setPrincipal(Principal user) { |
| if (this.user != null) |
| return false; |
| this.user = user; |
| return true; |
| } |
| |
| /** |
| * This method sets the ACL to have negative permissions. |
| * That is the user or group is denied the permission set |
| * specified in the entry. |
| */ |
| public void setNegativePermissions() { |
| negative = true; |
| } |
| |
| /** |
| * Returns true if this is a negative ACL. |
| */ |
| public boolean isNegative() { |
| return negative; |
| } |
| |
| /** |
| * A principal or a group can be associated with multiple |
| * permissions. This method adds a permission to the ACL entry. |
| * @param permission The permission to be associated with |
| * the principal or the group in the entry. |
| * @return true if the permission was added, false if the |
| * permission was already part of the permission set. |
| */ |
| public boolean addPermission(Permission permission) { |
| |
| if (permissionSet.contains(permission)) |
| return false; |
| |
| permissionSet.addElement(permission); |
| |
| return true; |
| } |
| |
| /** |
| * The method disassociates the permission from the Principal |
| * or the Group in this ACL entry. |
| * @param permission The permission to be disassociated with |
| * the principal or the group in the entry. |
| * @return true if the permission is removed, false if the |
| * permission is not part of the permission set. |
| */ |
| public boolean removePermission(Permission permission) { |
| return permissionSet.removeElement(permission); |
| } |
| |
| /** |
| * Checks if the passed permission is part of the allowed |
| * permission set in this entry. |
| * @param permission The permission that has to be part of |
| * the permission set in the entry. |
| * @return true if the permission passed is part of the |
| * permission set in the entry, false otherwise. |
| */ |
| public boolean checkPermission(Permission permission) { |
| return permissionSet.contains(permission); |
| } |
| |
| /** |
| * return an enumeration of the permissions in this ACL entry. |
| */ |
| public Enumeration<Permission> permissions() { |
| return permissionSet.elements(); |
| } |
| |
| /** |
| * Return a string representation of the contents of the ACL entry. |
| */ |
| public String toString() { |
| StringBuffer s = new StringBuffer(); |
| if (negative) |
| s.append("-"); |
| else |
| s.append("+"); |
| if (user instanceof Group) |
| s.append("Group."); |
| else |
| s.append("User."); |
| s.append(user + "="); |
| Enumeration<Permission> e = permissions(); |
| while(e.hasMoreElements()) { |
| Permission p = e.nextElement(); |
| s.append(p); |
| if (e.hasMoreElements()) |
| s.append(","); |
| } |
| return new String(s); |
| } |
| |
| /** |
| * Clones an AclEntry. |
| */ |
| @SuppressWarnings("unchecked") // Safe casts assuming clone() works correctly |
| public synchronized Object clone() { |
| AclEntryImpl cloned; |
| cloned = new AclEntryImpl(user); |
| cloned.permissionSet = (Vector<Permission>) permissionSet.clone(); |
| cloned.negative = negative; |
| return cloned; |
| } |
| |
| /** |
| * Return the Principal associated in this ACL entry. |
| * The method returns null if the entry uses a group |
| * instead of a principal. |
| */ |
| public Principal getPrincipal() { |
| return user; |
| } |
| } |