1 /*
   2  * Copyright (c) 1997, 2017, 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 import java.security.AccessController;
  29 import java.security.PrivilegedAction;
  30 
  31 /**
  32  * Class defined for safe calls of getClassLoader methods of any kind (context/system/class
  33  * classloader. This MUST be package private and defined in every package which
  34  * uses such invocations.
  35  * @author snajper
  36  */
  37 class SecureLoader {
  38 
  39     static ClassLoader getContextClassLoader() {
  40         if (System.getSecurityManager() == null) {
  41             return Thread.currentThread().getContextClassLoader();
  42         } else {
  43             return AccessController.doPrivileged(
  44                     new PrivilegedAction<ClassLoader>() {
  45                         @Override
  46                         public ClassLoader run() {
  47                             return Thread.currentThread().getContextClassLoader();
  48                         }
  49                     });
  50         }
  51     }
  52 
  53     static ClassLoader getClassClassLoader(final Class c) {
  54         if (System.getSecurityManager() == null) {
  55             return c.getClassLoader();
  56         } else {
  57             return AccessController.doPrivileged(
  58                     new PrivilegedAction<ClassLoader>() {
  59                         @Override
  60                         public ClassLoader run() {
  61                             return c.getClassLoader();
  62                         }
  63                     });
  64         }
  65     }
  66 
  67     static ClassLoader getSystemClassLoader() {
  68         if (System.getSecurityManager() == null) {
  69             return ClassLoader.getSystemClassLoader();
  70         } else {
  71             return AccessController.doPrivileged(
  72                     new PrivilegedAction<ClassLoader>() {
  73                         @Override
  74                         public ClassLoader run() {
  75                             return ClassLoader.getSystemClassLoader();
  76                         }
  77                     });
  78         }
  79     }
  80 
  81     static ClassLoader getParentClassLoader(final ClassLoader cl) {
  82         if (System.getSecurityManager() == null) {
  83             return cl.getParent();
  84         } else {
  85             return AccessController.doPrivileged(
  86                     new PrivilegedAction<ClassLoader>() {
  87                         @Override
  88                         public ClassLoader run() {
  89                             return cl.getParent();
  90                         }
  91                     });
  92         }
  93     }
  94 
  95     static void setContextClassLoader(final ClassLoader cl) {
  96         if (System.getSecurityManager() == null) {
  97             Thread.currentThread().setContextClassLoader(cl);
  98         } else {
  99             AccessController.doPrivileged(
 100                     new PrivilegedAction<ClassLoader>() {
 101                         @Override
 102                         public ClassLoader run() {
 103                             Thread.currentThread().setContextClassLoader(cl);
 104                             return null;
 105                         }
 106                     });
 107         }
 108     }
 109 
 110 }