1 /*
   2  * Copyright (c) 1998, 2006, 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 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 }