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| 1 | /* | ||
| 2 | * Copyright (c) 1998, 2004, Oracle and/or its affiliates. All rights reserved. | ||
| 3 | * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. | ||
| 4 | * | ||
| 5 | * This code is free software; you can redistribute it and/or modify it | ||
| 6 | * under the terms of the GNU General Public License version 2 only, as | ||
| 7 | * published by the Free Software Foundation. Oracle designates this | ||
| 8 | * particular file as subject to the "Classpath" exception as provided | ||
| 9 | * by Oracle 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 Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA | ||
| 22 | * or visit www.oracle.com if you need additional information or have any | ||
| 23 | * questions. | ||
| 24 | */ | ||
| 25 | |||
| 26 | package java.security; | ||
| 27 | |||
| 28 | |||
| 29 | /** | ||
| 30 | * A computation to be performed with privileges enabled. The computation is | ||
| 31 | * performed by invoking <code>AccessController.doPrivileged</code> on the | ||
| 32 | * <code>PrivilegedAction</code> object. This interface is used only for | ||
| 33 | * computations that do not throw checked exceptions; computations that | ||
| 34 | * throw checked exceptions must use <code>PrivilegedExceptionAction</code> | ||
| 35 | * instead. | ||
| 36 | * | ||
| 37 | * @see AccessController | ||
| 38 | * @see AccessController#doPrivileged(PrivilegedAction) | ||
| 39 | * @see PrivilegedExceptionAction | ||
| 40 | */ | ||
| 41 | |||
| 42 | public interface PrivilegedAction<T> { | ||
| 43 | /** | ||
| 44 | * Performs the computation. This method will be called by | ||
| 45 | * <code>AccessController.doPrivileged</code> after enabling privileges. | ||
| 46 | * | ||
| 47 | * @return a class-dependent value that may represent the results of the | ||
| 48 | * computation. Each class that implements | ||
| 49 | * <code>PrivilegedAction</code> | ||
| 50 | * should document what (if anything) this value represents. | ||
| 51 | * @see AccessController#doPrivileged(PrivilegedAction) | ||
| 52 | * @see AccessController#doPrivileged(PrivilegedAction, | ||
| 53 | * AccessControlContext) | ||
| 54 | */ | ||
| 55 | T run(); | ||
| 56 | } | ||