1 /*
   2  * Copyright (c) 1997, 2012, 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.codemodel.internal.fmt;
  27 
  28 import com.sun.codemodel.internal.*;
  29 
  30 /**
  31  * Class defined for safe calls of getClassLoader methods of any kind (context/system/class
  32  * classloader. This MUST be package private and defined in every package which
  33  * uses such invocations.
  34  * @author snajper
  35  */
  36 class SecureLoader {
  37 
  38     static ClassLoader getContextClassLoader() {
  39         if (System.getSecurityManager() == null) {
  40             return Thread.currentThread().getContextClassLoader();
  41         } else {
  42             return (ClassLoader) java.security.AccessController.doPrivileged(
  43                     new java.security.PrivilegedAction() {
  44                         public java.lang.Object run() {
  45                             return Thread.currentThread().getContextClassLoader();
  46                         }
  47                     });
  48         }
  49     }
  50 
  51     static ClassLoader getClassClassLoader(final Class c) {
  52         if (System.getSecurityManager() == null) {
  53             return c.getClassLoader();
  54         } else {
  55             return (ClassLoader) java.security.AccessController.doPrivileged(
  56                     new java.security.PrivilegedAction() {
  57                         public java.lang.Object run() {
  58                             return c.getClassLoader();
  59                         }
  60                     });
  61         }
  62     }
  63 
  64     static ClassLoader getSystemClassLoader() {
  65         if (System.getSecurityManager() == null) {
  66             return ClassLoader.getSystemClassLoader();
  67         } else {
  68             return (ClassLoader) java.security.AccessController.doPrivileged(
  69                     new java.security.PrivilegedAction() {
  70                         public java.lang.Object run() {
  71                             return ClassLoader.getSystemClassLoader();
  72                         }
  73                     });
  74         }
  75     }
  76 
  77     static void setContextClassLoader(final ClassLoader cl) {
  78         if (System.getSecurityManager() == null) {
  79             Thread.currentThread().setContextClassLoader(cl);
  80         } else {
  81             java.security.AccessController.doPrivileged(
  82                     new java.security.PrivilegedAction() {
  83                         public java.lang.Object run() {
  84                             Thread.currentThread().setContextClassLoader(cl);
  85                             return null;
  86                         }
  87                     });
  88         }
  89     }
  90 
  91 }