java.security
Class AccessController
Access control context and permission checker.
Can check permissions in the access control context of the current thread
through the checkPermission() method.
Manipulates the access control context for code that needs to be executed
the protection domain of the calling class (by explicitly ignoring the
context of the calling code) in the doPrivileged() methods.
And provides a getContext() method which gives the access
control context of the current thread that can be used for checking
permissions at a later time and/or in another thread.
static | T doPrivileged(PrivilegedAction action)- Calls the
run() method of the given action with as
(initial) access control context only the protection domain of the
calling class.
|
static | T doPrivileged(PrivilegedAction action, AccessControlContext context)- Calls the
run() method of the given action with as
(initial) access control context the given context combined with the
protection domain of the calling class.
|
static | T doPrivileged(PrivilegedExceptionAction action)- Calls the
run() method of the given action with as
(initial) access control context only the protection domain of the
calling class.
|
static | T doPrivileged(PrivilegedExceptionAction action, AccessControlContext context)- Calls the
run() method of the given action with as
(initial) access control context the given context combined with the
protection domain of the calling class.
|
static void | checkPermission(Permission perm)- Checks wether the access control context of the current thread allows
the given Permission.
|
static AccessControlContext | getContext()- Returns the complete access control context of the current thread.
|
clone, equals, extends Object> getClass, finalize, hashCode, notify, notifyAll, toString, wait, wait, wait |
T doPrivileged
public static T doPrivileged(PrivilegedAction action)
Calls the run() method of the given action with as
(initial) access control context only the protection domain of the
calling class. Calls to checkPermission() in the
run() method ignore all earlier protection domains of
classes in the call chain. Note that the protection domains of classes
called by the code in the run() method are not ignored.
action - the PrivilegedAction whose run()
should be be called.
- the result of the
action.run() method.
T doPrivileged
public static T doPrivileged(PrivilegedAction action,
AccessControlContext context)
Calls the run() method of the given action with as
(initial) access control context the given context combined with the
protection domain of the calling class. Calls to
checkPermission() in the run() method ignore
all earlier protection domains of classes in the call chain, but add
checks for the protection domains given in the supplied context.
action - the PrivilegedAction whose run()
should be be called.context - the AccessControlContext whose protection
domains should be added to the protection domain of the calling class.
- the result of the
action.run() method.
T doPrivileged
public static T doPrivileged(PrivilegedExceptionAction action)
throws PrivilegedActionException
Calls the run() method of the given action with as
(initial) access control context only the protection domain of the
calling class. Calls to checkPermission() in the
run() method ignore all earlier protection domains of
classes in the call chain. Note that the protection domains of classes
called by the code in the run() method are not ignored.
If the run() method throws an exception then this method
will wrap that exception in an PrivilegedActionException.
action - the PrivilegedExceptionAction whose
run() should be be called.
- the result of the
action.run() method.
T doPrivileged
public static T doPrivileged(PrivilegedExceptionAction action,
AccessControlContext context)
throws PrivilegedActionException
Calls the run() method of the given action with as
(initial) access control context the given context combined with the
protection domain of the calling class. Calls to
checkPermission() in the run() method ignore
all earlier protection domains of classes in the call chain, but add
checks for the protection domains given in the supplied context.
If the run() method throws an exception then this method
will wrap that exception in an PrivilegedActionException.
action - the PrivilegedExceptionAction whose
run() should be be called.context - the AccessControlContext whose protection
domains should be added to the protection domain of the calling class.
- the result of the
action.run() method.
checkPermission
public static void checkPermission(Permission perm)
throws AccessControlException Checks wether the access control context of the current thread allows
the given Permission. Throws an AccessControlException
when the permission is not allowed in the current context. Otherwise
returns silently without throwing an exception.
perm - the permission to be checked.
getContext
public static AccessControlContext getContext()
Returns the complete access control context of the current thread.
The returned object encompasses all
ProtectionDomain objects
for all classes in the current call stack, or the set of protection
domains until the last call to
doPrivileged(java.security.PrivilegedAction).
Additionally, if a call was made to
doPrivileged(java.security.PrivilegedAction,java.security.AccessControlContext)
that supplied an
AccessControlContext, then that context
will be intersected with the calculated one.
AccessController.java --- Access control context and permission checker
Copyright (C) 2001, 2004 Free Software Foundation, Inc.
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