/**************************************************************************
* Copyright (c) 2001 by Punch Telematix. All rights reserved. *
* *
* Redistribution and use in source and binary forms, with or without *
* modification, are permitted provided that the following conditions *
* are met: *
* 1. Redistributions of source code must retain the above copyright *
* notice, this list of conditions and the following disclaimer. *
* 2. Redistributions in binary form must reproduce the above copyright *
* notice, this list of conditions and the following disclaimer in the *
* documentation and/or other materials provided with the distribution. *
* 3. Neither the name of Punch Telematix nor the names of *
* other contributors may be used to endorse or promote products *
* derived from this software without specific prior written permission.*
* *
* THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESS OR IMPLIED *
* WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF *
* MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. *
* IN NO EVENT SHALL PUNCH TELEMATIX OR OTHER CONTRIBUTORS BE LIABLE *
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR *
* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF *
* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR *
* BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, *
* WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE *
* OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN *
* IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. *
**************************************************************************/
/**
* $Id: AccessController.java,v 1.1.1.1 2004/07/12 14:07:46 cvs Exp $
*/
package java.security;
/** Utitlity class responsible for launching privileged code.
** Also contains the method used to take a snapshot of the current context.
**@author ACUNIA NV
**@version $Version:$
*/
public final class AccessController {
static {
initialize();
}
private static native void initialize();
private static native Object doPrivileged0 (PrivilegedAction action, AccessControlContext context);
private static native Object doPrivileged0 (PrivilegedExceptionAction action, AccessControlContext context) throws Exception;
/** Launch some privileged code in the current context.
*/
public static Object doPrivileged (PrivilegedAction action) {
return doPrivileged(action, getContext());
}
/** Launch some privileged code in another context.
*/
public static Object doPrivileged (PrivilegedAction action, AccessControlContext context) {
return doPrivileged0(action, new AccessControlContext(get_calling_domains(), get_inherited_context(), context));
}
/** Launch some privileged code in the current context.
** The privileged code can throw checked Exceptions.
*/
public static Object doPrivileged (PrivilegedExceptionAction action) throws PrivilegedActionException {
try {
return doPrivileged0(action, getContext());
}
catch(Exception e){
throw new PrivilegedActionException(e);
}
}
/** Launch some privileged code in another context.
** The privileged code can throw checked Exceptions.
*/
public static Object doPrivileged (PrivilegedExceptionAction action, AccessControlContext context) throws PrivilegedActionException {
try {
return doPrivileged0(action, new AccessControlContext(get_calling_domains(), get_inherited_context(), context));
}
catch(Exception e){
throw new PrivilegedActionException(e);
}
}
/* Take a snapshot of the current context.
*/
public static AccessControlContext getContext() {
return new AccessControlContext(get_calling_domains(), get_inherited_context());
}
/** Get the list of ProtectionDomains associated with the current context.
*/
private static native ProtectionDomain[] get_calling_domains();
/** Get the AccessControlContext which was inherited by the most recent privileged frame.
** (In the worst case this will be the root frame).
*/
private static native AccessControlContext get_inherited_context();
public static void checkPermission (Permission perm) throws AccessControlException {
try {
getContext().checkPermission(perm);
}
catch(AccessControlException e) {
throw new AccessControlException("Context: " + getContext() + " Permission: " + perm);
}
}
private AccessController(){}
}