| /* |
| * java.lang.SecurityManager: part of the Java Class Libraries project. |
| * Copyright (C) 1998, 2001, 2002, 2005 Free Software Foundation |
| * |
| * This library is free software; you can redistribute it and/or |
| * modify it under the terms of the GNU Library General Public |
| * License as published by the Free Software Foundation; either |
| * version 2 of the License, or (at your option) any later version. |
| * |
| * This library is distributed in the hope that it will be useful, |
| * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
| * Library General Public License for more details. |
| * |
| * You should have received a copy of the GNU Library General Public |
| * License along with this library; if not, write to the |
| * Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, |
| * Boston, MA 02110-1301, USA. |
| */ |
| |
| package java.lang; |
| |
| import java.net.*; |
| import java.util.*; |
| import java.io.*; |
| |
| /** |
| ** VMSecurityManager is a helper class for SecurityManager the VM must |
| ** implement. |
| ** |
| ** @author John Keiser |
| ** @version 1.1.0, 31 May 1998 |
| **/ |
| class VMSecurityManager |
| { |
| /** Get a list of all the classes currently executing |
| ** methods on the Java stack. getClassContext()[0] is |
| ** the currently executing method |
| ** <STRONG>Spec Note:</STRONG> does not say whether |
| ** the stack will include the getClassContext() call or |
| ** the one just before it. |
| ** |
| ** @return an array containing all the methods on classes |
| ** on the Java execution stack. |
| **/ |
| static native Class[] getClassContext(Class caller); |
| |
| /** Get the current ClassLoader--the one nearest to the |
| ** top of the stack. |
| ** @return the current ClassLoader. |
| **/ |
| static ClassLoader currentClassLoader(Class caller) |
| { |
| // The docs above are wrong. See the online docs. |
| // FIXME this implementation is a bit wrong too -- the docs say we |
| // must also consider ancestors of the system class loader. |
| ClassLoader systemClassLoader = ClassLoader.systemClassLoader; |
| Class[] classStack = getClassContext (caller); |
| for (int i = 0; i < classStack.length; i++) |
| { |
| ClassLoader loader = classStack[i].getClassLoader(); |
| if (loader != null && loader != systemClassLoader) |
| return loader; |
| } |
| |
| return null; |
| } |
| } |