+++ /dev/null
-/* AccessController.java --- Access control context and permission checker
- Copyright (C) 2001 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., 59 Temple Place, Suite 330, Boston, MA
-02111-1307 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. */
-
-package java.security;
-
-/**
- * Access control context and permission checker.
- * Can check permissions in the access control context of the current thread
- * through the <code>checkPermission()</code> 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 <code>doPriviliged()</code> methods.
- * And provides a <code>getContext()</code> 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.
- * <p>
- * XXX - Mostly a stub implementation at the moment. Needs native support
- * from the VM to function correctly. XXX - Do not forget to think about
- * how to handle <code>java.lang.reflect.Method.invoke()</code> on the
- * <code>doPrivileged()</code> methods.
- *
- * @author Mark Wielaard (mark@klomp.org)
- * @since 1.2
- */
-public final class AccessController
-{
- /**
- * This class only has static methods so there is no public contructor.
- */
- private AccessController()
- {
- }
-
- /**
- * Checks wether the access control context of the current thread allows
- * the given Permission. Throws an <code>AccessControlException</code>
- * when the permission is not allowed in the current context. Otherwise
- * returns silently without throwing an exception.
- *
- * @param perm the permission to be checked.
- * @exception AccessControlException thrown if the current context does not
- * allow the given permission.
- */
- public static void checkPermission(Permission perm)
- throws AccessControlException
- {
- getContext().checkPermission(perm);
- }
-
- /**
- * Calls the <code>run()</code> method of the given action with as
- * (initial) access control context only the protection domain of the
- * calling class. Calls to <code>checkPermission()</code> in the
- * <code>run()</code> 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 <code>run()</code> method are not ignored.
- *
- * @param action the <code>PrivilegedAction</code> whose <code>run()</code>
- * should be be called.
- * @returns the result of the <code>action.run()</code> method.
- */
- public static Object doPrivileged(PrivilegedAction action)
- {
- return action.run();
- }
-
- /**
- * Calls the <code>run()</code> 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
- * <code>checkPermission()</code> in the <code>run()</code> method ignore
- * all earlier protection domains of classes in the call chain, but add
- * checks for the protection domains given in the supplied context.
- *
- * @param action the <code>PrivilegedAction</code> whose <code>run()</code>
- * should be be called.
- * @param context the <code>AccessControlContext</code> whose protection
- * domains should be added to the protection domain of the calling class.
- * @returns the result of the <code>action.run()</code> method.
- */
- public static Object doPrivileged(PrivilegedAction action,
- AccessControlContext context)
- {
- return action.run();
- }
-
- /**
- * Calls the <code>run()</code> method of the given action with as
- * (initial) access control context only the protection domain of the
- * calling class. Calls to <code>checkPermission()</code> in the
- * <code>run()</code> 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 <code>run()</code> method are not ignored.
- * If the <code>run()</code> method throws an exception then this method
- * will wrap that exception in an <code>PrivilegedActionException</code>.
- *
- * @param action the <code>PrivilegedExceptionAction</code> whose
- * <code>run()</code> should be be called.
- * @returns the result of the <code>action.run()</code> method.
- * @exception PriviligedActionException wrapped around any exception that
- * is thrown in the <code>run()</code> method.
- */
- public static Object doPrivileged(PrivilegedExceptionAction action)
- throws PrivilegedActionException
- {
-
- try
- {
- return action.run();
- }
- catch (Exception e)
- {
- throw new PrivilegedActionException(e);
- }
- }
-
- /**
- * Calls the <code>run()</code> 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
- * <code>checkPermission()</code> in the <code>run()</code> 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 <code>run()</code> method throws an exception then this method
- * will wrap that exception in an <code>PrivilegedActionException</code>.
- *
- * @param action the <code>PrivilegedExceptionAction</code> whose
- * <code>run()</code> should be be called.
- * @param context the <code>AccessControlContext</code> whose protection
- * domains should be added to the protection domain of the calling class.
- * @returns the result of the <code>action.run()</code> method.
- * @exception PriviligedActionException wrapped around any exception that
- * is thrown in the <code>run()</code> method.
- */
- public static Object doPrivileged(PrivilegedExceptionAction action,
- AccessControlContext context)
- throws PrivilegedActionException
- {
-
- try
- {
- return action.run();
- }
- catch (Exception e)
- {
- throw new PrivilegedActionException(e);
- }
- }
-
- /**
- * Returns the complete access control context of the current thread.
- * <p>
- * XXX - Should this include all the protection domains in the call chain
- * or only the domains till the last <code>doPrivileged()</code> call?
- * <p>
- * XXX - needs native support. Currently returns an empty context.
- */
- public static AccessControlContext getContext()
- {
- // For now just return an new empty context
- return new AccessControlContext(new ProtectionDomain[0]);
- }
-}
projects / msp430-gcc.git / blobdiff