69 lines
2.3 KiB
Java
69 lines
2.3 KiB
Java
/*
|
|
* 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;
|
|
}
|
|
}
|