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    1   /* ObjectInputStream.java -- Class used to read serialized objects
    2      Copyright (C) 1998, 1999, 2000, 2001, 2002, 2003, 2005
    3      Free Software Foundation, Inc.
    4   
    5   This file is part of GNU Classpath.
    6   
    7   GNU Classpath is free software; you can redistribute it and/or modify
    8   it under the terms of the GNU General Public License as published by
    9   the Free Software Foundation; either version 2, or (at your option)
   10   any later version.
   11   
   12   GNU Classpath is distributed in the hope that it will be useful, but
   13   WITHOUT ANY WARRANTY; without even the implied warranty of
   14   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
   15   General Public License for more details.
   16   
   17   You should have received a copy of the GNU General Public License
   18   along with GNU Classpath; see the file COPYING.  If not, write to the
   19   Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
   20   02110-1301 USA.
   21   
   22   Linking this library statically or dynamically with other modules is
   23   making a combined work based on this library.  Thus, the terms and
   24   conditions of the GNU General Public License cover the whole
   25   combination.
   26   
   27   As a special exception, the copyright holders of this library give you
   28   permission to link this library with independent modules to produce an
   29   executable, regardless of the license terms of these independent
   30   modules, and to copy and distribute the resulting executable under
   31   terms of your choice, provided that you also meet, for each linked
   32   independent module, the terms and conditions of the license of that
   33   module.  An independent module is a module which is not derived from
   34   or based on this library.  If you modify this library, you may extend
   35   this exception to your version of the library, but you are not
   36   obligated to do so.  If you do not wish to do so, delete this
   37   exception statement from your version. */
   38   
   39   
   40   package java.io;
   41   
   42   import gnu.classpath.Configuration;
   43   import gnu.classpath.VMStackWalker;
   44   import java.lang.reflect.Constructor;
   45   import java.security.AccessController;
   46   import java.security.PrivilegedAction;
   47   
   48   final class VMObjectInputStream
   49   {
   50     static
   51     {
   52       if (Configuration.INIT_LOAD_LIBRARY)
   53         {
   54   	System.loadLibrary("javaio");
   55         }
   56     }
   57   
   58     /**
   59      * PrivilegedAction needed for Class.getClassLoader()
   60      */ 
   61     private static PrivilegedAction loaderAction = new PrivilegedAction()
   62     {
   63      /**
   64        * Returns the first user defined class loader on the call stack, or the
   65        * context class loader of the current thread, when no non-null class loader
   66        * was found.
   67        */
   68       public Object run()
   69       {
   70         Class[] ctx = VMStackWalker.getClassContext();
   71   
   72         for (int i = 0; i < ctx.length; i++)
   73           {
   74             ClassLoader cl = ctx[i].getClassLoader();
   75             if (cl != null)
   76               return cl;
   77           }
   78         return Thread.currentThread().getContextClassLoader();
   79       }
   80       };
   81   
   82     /**
   83      * Returns the first user defined class loader on the call stack, or the
   84      * context class loader of the current thread, when no non-null class loader
   85      * was found.
   86      * 
   87      * @return the class loader
   88      */
   89     static ClassLoader currentClassLoader()
   90     {
   91       return (ClassLoader) AccessController.doPrivileged(loaderAction);
   92     }
   93   
   94     /**
   95      * Allocates a new Object of type clazz but without running the
   96      * default constructor on it. It then calls the given constructor on
   97      * it. The given constructor method comes from the constr_clazz
   98      * which is a super class of the given clazz.
   99      */
  100     static native Object allocateObject(Class clazz, Class constr_clazz,
  101   				      Constructor constructor)
  102       throws InstantiationException;
  103   }

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