/*
* Copyright 1998-2006 Sun Microsystems, Inc. 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. Sun designates this
* particular file as subject to the "Classpath" exception as provided
* by Sun 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 Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
* CA 95054 USA or visit www.sun.com if you need additional information or
* have any questions.
*/
package java.security;
import java.security.*;
import java.util.Enumeration;
import java.util.Hashtable;
import java.util.StringTokenizer;
import sun.security.util.SecurityConstants;
/**
* The AllPermission is a permission that implies all other permissions.
* <p>
* <b>Note:</b> Granting AllPermission should be done with extreme care,
* as it implies all other permissions. Thus, it grants code the ability
* to run with security
* disabled. Extreme caution should be taken before granting such
* a permission to code. This permission should be used only during testing,
* or in extremely rare cases where an application or applet is
* completely trusted and adding the necessary permissions to the policy
* is prohibitively cumbersome.
*
* @see java.security.Permission
* @see java.security.AccessController
* @see java.security.Permissions
* @see java.security.PermissionCollection
* @see java.lang.SecurityManager
*
*
* @author Roland Schemers
*
* @serial exclude
*/
public final class AllPermission extends Permission {
private static final long serialVersionUID = -2916474571451318075L;
/**
* Creates a new AllPermission object.
*/
public AllPermission()
{
super("<all permissions>");
}
/**
* Creates a new AllPermission object. This
* constructor exists for use by the <code>Policy</code> object
* to instantiate new Permission objects.
*
* @param name ignored
* @param actions ignored.
*/
public AllPermission(String name, String actions)
{
this();
}
/**
* Checks if the specified permission is "implied" by
* this object. This method always returns true.
*
* @param p the permission to check against.
*
* @return return
*/
public boolean implies(Permission p) {
return true;
}
/**
* Checks two AllPermission objects for equality. Two AllPermission
* objects are always equal.
*
* @param obj the object we are testing for equality with this object.
* @return true if <i>obj</i> is an AllPermission, false otherwise.
*/
public boolean equals(Object obj) {
return (obj instanceof AllPermission);
}
/**
* Returns the hash code value for this object.
*
* @return a hash code value for this object.
*/
public int hashCode() {
return 1;
}
/**
* Returns the canonical string representation of the actions.
*
* @return the actions.
*/
public String getActions()
{
return "<all actions>";
}
/**
* Returns a new PermissionCollection object for storing AllPermission
* objects.
* <p>
*
* @return a new PermissionCollection object suitable for
* storing AllPermissions.
*/
public PermissionCollection newPermissionCollection() {
return new AllPermissionCollection();
}
}
/**
* A AllPermissionCollection stores a collection
* of AllPermission permissions. AllPermission objects
* must be stored in a manner that allows them to be inserted in any
* order, but enable the implies function to evaluate the implies
* method in an efficient (and consistent) manner.
*
* @see java.security.Permission
* @see java.security.Permissions
*
*
* @author Roland Schemers
*
* @serial include
*/
final class AllPermissionCollection
extends PermissionCollection
implements java.io.Serializable
{
// use serialVersionUID from JDK 1.2.2 for interoperability
private static final long serialVersionUID = -4023755556366636806L;
private boolean all_allowed; // true if any all permissions have been added
/**
* Create an empty AllPermissions object.
*
*/
public AllPermissionCollection() {
all_allowed = false;
}
/**
* Adds a permission to the AllPermissions. The key for the hash is
* permission.path.
*
* @param permission the Permission object to add.
*
* @exception IllegalArgumentException - if the permission is not a
* AllPermission
*
* @exception SecurityException - if this AllPermissionCollection object
* has been marked readonly
*/
public void add(Permission permission)
{
if (! (permission instanceof AllPermission))
throw new IllegalArgumentException("invalid permission: "+
permission);
if (isReadOnly())
throw new SecurityException("attempt to add a Permission to a readonly PermissionCollection");
all_allowed = true; // No sync; staleness OK
}
/**
* Check and see if this set of permissions implies the permissions
* expressed in "permission".
*
* @param p the Permission object to compare
*
* @return always returns true.
*/
public boolean implies(Permission permission)
{
return all_allowed; // No sync; staleness OK
}
/**
* Returns an enumeration of all the AllPermission objects in the
* container.
*
* @return an enumeration of all the AllPermission objects.
*/
public Enumeration<Permission> elements()
{
return new Enumeration<Permission>() {
private boolean hasMore = all_allowed;
public boolean hasMoreElements() {
return hasMore;
}
public Permission nextElement() {
hasMore = false;
return SecurityConstants.ALL_PERMISSION;
}
};
}
}