1 /*

     2  * Copyright (c) 1997, 2013, 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 com.sun.istack.internal.tools;

    27 

    28 /**

    29  * Class defined for safe calls of getClassLoader methods of any kind (context/system/class

    30  * classloader. This MUST be package private and defined in every package which

    31  * uses such invocations.

    32  * @author snajper

    33  */

    34 class SecureLoader {

    35 

    36     static ClassLoader getContextClassLoader() {

    37         if (System.getSecurityManager() == null) {

    38             return Thread.currentThread().getContextClassLoader();

    39         } else {

    40             return (ClassLoader) java.security.AccessController.doPrivileged(

    41                     new java.security.PrivilegedAction() {

    42                         public java.lang.Object run() {

    43                             return Thread.currentThread().getContextClassLoader();

    44                         }

    45                     });

    46         }

    47     }

    48 

    49     static ClassLoader getClassClassLoader(final Class c) {

    50         if (System.getSecurityManager() == null) {

    51             return c.getClassLoader();

    52         } else {

    53             return (ClassLoader) java.security.AccessController.doPrivileged(

    54                     new java.security.PrivilegedAction() {

    55                         public java.lang.Object run() {

    56                             return c.getClassLoader();

    57                         }

    58                     });

    59         }

    60     }

    61 

    62     static ClassLoader getSystemClassLoader() {

    63         if (System.getSecurityManager() == null) {

    64             return ClassLoader.getSystemClassLoader();

    65         } else {

    66             return (ClassLoader) java.security.AccessController.doPrivileged(

    67                     new java.security.PrivilegedAction() {

    68                         public java.lang.Object run() {

    69                             return ClassLoader.getSystemClassLoader();

    70                         }

    71                     });

    72         }

    73     }

    74 

    75     static ClassLoader getParentClassLoader(final ClassLoader cl) {

    76         if (System.getSecurityManager() == null) {

    77             return cl.getParent();

    78         } else {

    79             return (ClassLoader) java.security.AccessController.doPrivileged(

    80                     new java.security.PrivilegedAction() {

    81                         public java.lang.Object run() {

    82                             return cl.getParent();

    83                         }

    84                     });

    85         }

    86     }

    87 

    88     static void setContextClassLoader(final ClassLoader cl) {

    89         if (System.getSecurityManager() == null) {

    90             Thread.currentThread().setContextClassLoader(cl);

    91         } else {

    92             java.security.AccessController.doPrivileged(

    93                     new java.security.PrivilegedAction() {

    94                         public java.lang.Object run() {

    95                             Thread.currentThread().setContextClassLoader(cl);

    96                             return null;

    97                         }

    98                     });

    99         }

   100     }

   101 

   102 }