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/*
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* Copyright (c) 1998, 2006, Oracle and/or its affiliates. All rights reserved.
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* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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*
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* This code is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License version 2 only, as
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* published by the Free Software Foundation. Oracle designates this
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* particular file as subject to the "Classpath" exception as provided
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* by Oracle in the LICENSE file that accompanied this code.
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*
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* This code is distributed in the hope that it will be useful, but WITHOUT
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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* version 2 for more details (a copy is included in the LICENSE file that
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* accompanied this code).
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*
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* You should have received a copy of the GNU General Public License version
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* 2 along with this work; if not, write to the Free Software Foundation,
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* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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*
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* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
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* or visit www.oracle.com if you need additional information or have any
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* questions.
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*/
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package java.security;
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import java.security.*;
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import java.util.Enumeration;
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import java.util.Hashtable;
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import java.util.StringTokenizer;
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import sun.security.util.SecurityConstants;
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/**
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* The AllPermission is a permission that implies all other permissions.
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* <p>
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* <b>Note:</b> Granting AllPermission should be done with extreme care,
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* as it implies all other permissions. Thus, it grants code the ability
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* to run with security
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* disabled. Extreme caution should be taken before granting such
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* a permission to code. This permission should be used only during testing,
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* or in extremely rare cases where an application or applet is
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* completely trusted and adding the necessary permissions to the policy
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* is prohibitively cumbersome.
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*
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* @see java.security.Permission
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* @see java.security.AccessController
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* @see java.security.Permissions
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* @see java.security.PermissionCollection
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* @see java.lang.SecurityManager
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*
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*
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* @author Roland Schemers
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*
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* @serial exclude
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*/
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public final class AllPermission extends Permission {
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private static final long serialVersionUID = -2916474571451318075L;
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/**
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* Creates a new AllPermission object.
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*/
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public AllPermission()
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{
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super("<all permissions>");
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}
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/**
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* Creates a new AllPermission object. This
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* constructor exists for use by the <code>Policy</code> object
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* to instantiate new Permission objects.
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*
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* @param name ignored
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* @param actions ignored.
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*/
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public AllPermission(String name, String actions)
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{
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this();
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}
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/**
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* Checks if the specified permission is "implied" by
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* this object. This method always returns true.
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*
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* @param p the permission to check against.
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*
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* @return return
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*/
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public boolean implies(Permission p) {
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return true;
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}
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/**
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* Checks two AllPermission objects for equality. Two AllPermission
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* objects are always equal.
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*
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* @param obj the object we are testing for equality with this object.
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* @return true if <i>obj</i> is an AllPermission, false otherwise.
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*/
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public boolean equals(Object obj) {
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return (obj instanceof AllPermission);
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}
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/**
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* Returns the hash code value for this object.
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*
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* @return a hash code value for this object.
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*/
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public int hashCode() {
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return 1;
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}
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/**
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* Returns the canonical string representation of the actions.
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*
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* @return the actions.
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*/
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public String getActions()
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{
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return "<all actions>";
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}
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/**
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* Returns a new PermissionCollection object for storing AllPermission
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* objects.
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* <p>
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*
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* @return a new PermissionCollection object suitable for
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* storing AllPermissions.
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*/
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public PermissionCollection newPermissionCollection() {
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return new AllPermissionCollection();
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}
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}
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/**
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* A AllPermissionCollection stores a collection
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* of AllPermission permissions. AllPermission objects
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* must be stored in a manner that allows them to be inserted in any
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* order, but enable the implies function to evaluate the implies
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* method in an efficient (and consistent) manner.
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*
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* @see java.security.Permission
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* @see java.security.Permissions
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*
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*
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* @author Roland Schemers
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*
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* @serial include
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*/
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final class AllPermissionCollection
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extends PermissionCollection
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implements java.io.Serializable
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{
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// use serialVersionUID from JDK 1.2.2 for interoperability
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private static final long serialVersionUID = -4023755556366636806L;
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private boolean all_allowed; // true if any all permissions have been added
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/**
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* Create an empty AllPermissions object.
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*
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*/
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public AllPermissionCollection() {
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all_allowed = false;
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}
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/**
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* Adds a permission to the AllPermissions. The key for the hash is
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* permission.path.
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*
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* @param permission the Permission object to add.
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*
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* @exception IllegalArgumentException - if the permission is not a
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* AllPermission
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*
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* @exception SecurityException - if this AllPermissionCollection object
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* has been marked readonly
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*/
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public void add(Permission permission)
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{
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if (! (permission instanceof AllPermission))
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throw new IllegalArgumentException("invalid permission: "+
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permission);
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if (isReadOnly())
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throw new SecurityException("attempt to add a Permission to a readonly PermissionCollection");
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all_allowed = true; // No sync; staleness OK
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}
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/**
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* Check and see if this set of permissions implies the permissions
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* expressed in "permission".
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*
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* @param p the Permission object to compare
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*
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* @return always returns true.
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*/
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public boolean implies(Permission permission)
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{
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return all_allowed; // No sync; staleness OK
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}
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/**
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* Returns an enumeration of all the AllPermission objects in the
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* container.
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*
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* @return an enumeration of all the AllPermission objects.
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*/
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public Enumeration<Permission> elements()
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{
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return new Enumeration<Permission>() {
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private boolean hasMore = all_allowed;
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public boolean hasMoreElements() {
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return hasMore;
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}
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public Permission nextElement() {
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hasMore = false;
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return SecurityConstants.ALL_PERMISSION;
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}
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};
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}
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}
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