old-autovect-branch/libjava/classpath/vm/reference/java/io/VMObjectInputStream.java

   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   // PrivilegedAction needed for Class.getClassLoader()
  59   private static PrivilegedAction loaderAction = new PrivilegedAction()
  60     {
  61       public Object run()
  62       {
  63         Class[] ctx = VMStackWalker.getClassContext();
  64         for (int i = 0; i < ctx.length; i++)
  65           {
  66             ClassLoader cl = ctx[i].getClassLoader();
  67             if (cl != null)
  68               return cl;
  69           }
  70         return null;
  71       }
  72     };
  73
  74   /**
  75    * Returns the first user defined class loader on the call stack, or
  76    * null when no non-null class loader was found.
  77    */
  78   static ClassLoader currentClassLoader()
  79   {
  80     return (ClassLoader) AccessController.doPrivileged(loaderAction);
  81   }
  82
  83   /**
  84    * Allocates a new Object of type clazz but without running the
  85    * default constructor on it. It then calls the given constructor on
  86    * it. The given constructor method comes from the constr_clazz
  87    * which is a super class of the given clazz.
  88    */
  89   static native Object allocateObject(Class clazz, Class constr_clazz,
  90                                       Constructor constructor)
  91     throws InstantiationException;
  92 }