01 /*
02 * Copyright 1998-2004 Sun Microsystems, Inc. All Rights Reserved.
03 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
04 *
05 * This code is free software; you can redistribute it and/or modify it
06 * under the terms of the GNU General Public License version 2 only, as
07 * published by the Free Software Foundation. Sun designates this
08 * particular file as subject to the "Classpath" exception as provided
09 * by Sun in the LICENSE file that accompanied this code.
10 *
11 * This code is distributed in the hope that it will be useful, but WITHOUT
12 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
13 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
14 * version 2 for more details (a copy is included in the LICENSE file that
15 * accompanied this code).
16 *
17 * You should have received a copy of the GNU General Public License version
18 * 2 along with this work; if not, write to the Free Software Foundation,
19 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
20 *
21 * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
22 * CA 95054 USA or visit www.sun.com if you need additional information or
23 * have any questions.
24 */
25
26 package java.security;
27
28 /**
29 * A computation to be performed with privileges enabled. The computation is
30 * performed by invoking <code>AccessController.doPrivileged</code> on the
31 * <code>PrivilegedAction</code> object. This interface is used only for
32 * computations that do not throw checked exceptions; computations that
33 * throw checked exceptions must use <code>PrivilegedExceptionAction</code>
34 * instead.
35 *
36 * @see AccessController
37 * @see AccessController#doPrivileged(PrivilegedAction)
38 * @see PrivilegedExceptionAction
39 */
40
41 public interface PrivilegedAction<T> {
42 /**
43 * Performs the computation. This method will be called by
44 * <code>AccessController.doPrivileged</code> after enabling privileges.
45 *
46 * @return a class-dependent value that may represent the results of the
47 * computation. Each class that implements
48 * <code>PrivilegedAction</code>
49 * should document what (if anything) this value represents.
50 * @see AccessController#doPrivileged(PrivilegedAction)
51 * @see AccessController#doPrivileged(PrivilegedAction,
52 * AccessControlContext)
53 */
54 T run();
55 }
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