java.security
Class Policy
Policy is an abstract class for managing the system security
policy for the Java application environment. It specifies which permissions
are available for code from various sources. The security policy is
represented through a subclass of
Policy.
Only one
Policy is in effect at any time. A
ProtectionDomain initializes itself with information from this class
on the set of permssions to grant.
The location for the actual
Policy could be anywhere in any
form because it depends on the Policy implementation. The default system is
in a flat ASCII file or it could be in a database.
The current installed
Policy can be accessed with
getPolicy() and changed with
setPolicy(Policy) if the code
has the correct permissions.
The
refresh() method causes the
Policy instance to
refresh/reload its configuration. The method used to refresh depends on the
Policy implementation.
When a protection domain initializes its permissions, it uses code like
the following:
policy = Policy.getPolicy();
PermissionCollection perms = policy.getPermissions(myCodeSource);
The protection domain passes the
Policy handler a
CodeSource instance which contains the codebase URL and a public key.
The
Policy implementation then returns the proper set of
permissions for that
CodeSource.
The default
Policy implementation can be changed by setting
the "policy.provider" security provider in the "java.security" file to the
correct
Policy implementation class.
Policy()- Constructs a new
Policy object.
|
clone, equals, extends Object> getClass, finalize, hashCode, notify, notifyAll, toString, wait, wait, wait |
Policy
public Policy()
Constructs a new Policy object.
getPolicy
public static Policy getPolicy()
Returns the currently installed
Policy handler. The value
should not be cached as it can be changed any time by
setPolicy(Policy).
refresh
public abstract void refresh()
Causes this Policy instance to refresh / reload its
configuration. The method used to refresh depends on the concrete
implementation.
setPolicy
public static void setPolicy(Policy policy)
Sets the Policy handler to a new value.
policy - the new Policy to use.
Policy.java --- Policy Manager Class
Copyright (C) 1999, 2003, 2004 Free Software Foundation, Inc.
This file is part of GNU Classpath.
GNU Classpath is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 2, or (at your option)
any later version.
GNU Classpath 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 for more details.
You should have received a copy of the GNU General Public License
along with GNU Classpath; see the file COPYING. If not, write to the
Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
02110-1301 USA.
Linking this library statically or dynamically with other modules is
making a combined work based on this library. Thus, the terms and
conditions of the GNU General Public License cover the whole
combination.
As a special exception, the copyright holders of this library give you
permission to link this library with independent modules to produce an
executable, regardless of the license terms of these independent
modules, and to copy and distribute the resulting executable under
terms of your choice, provided that you also meet, for each linked
independent module, the terms and conditions of the license of that
module. An independent module is a module which is not derived from
or based on this library. If you modify this library, you may extend
this exception to your version of the library, but you are not
obligated to do so. If you do not wish to do so, delete this
exception statement from your version.