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/*
* 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;
}
}
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