1 /*
2 * Copyright 1998-2006 Sun Microsystems, Inc. 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. Sun designates this
8 * particular file as subject to the "Classpath" exception as provided
9 * 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 sun.security.action;
27
28 /**
29 * A convenience class for loading a system library as a privileged action.
30 *
31 * <p>An instance of this class can be used as the argument of
32 * <code>AccessController.doPrivileged</code>.
33 *
34 * <p>The following code attempts to load the system library named
35 * <code>"lib"</code> as a privileged action: <p>
36 *
37 * <pre>
38 * java.security.AccessController.doPrivileged(new LoadLibraryAction("lib"));
39 * </pre>
40 *
41 * @author Roland Schemers
42 * @see java.security.PrivilegedAction
43 * @see java.security.AccessController
44 * @since 1.2
45 */
46
47 public class LoadLibraryAction implements java.security.PrivilegedAction<Void> {
48 private String theLib;
49
50 /**
51 * Constructor that takes the name of the system library that needs to be
52 * loaded.
53 *
54 * <p>The manner in which a library name is mapped to the
55 * actual system library is system dependent.
56 *
57 * @param theLib the name of the library.
58 */
59 public LoadLibraryAction(String theLib) {
60 this.theLib = theLib;
61 }
62
63 /**
64 * Loads the system library whose name was specified in the constructor.
65 */
66 public Void run() {
67 System.loadLibrary(theLib);
68 return null;
69 }
70 }
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