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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