1/*
2 * Copyright (C) 2014 The Android Open Source Project
3 * Copyright (c) 1996, 2011, Oracle and/or its affiliates. All rights reserved.
4 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
5 *
6 * This code is free software; you can redistribute it and/or modify it
7 * under the terms of the GNU General Public License version 2 only, as
8 * published by the Free Software Foundation.  Oracle designates this
9 * particular file as subject to the "Classpath" exception as provided
10 * by Oracle in the LICENSE file that accompanied this code.
11 *
12 * This code is distributed in the hope that it will be useful, but WITHOUT
13 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
14 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
15 * version 2 for more details (a copy is included in the LICENSE file that
16 * accompanied this code).
17 *
18 * You should have received a copy of the GNU General Public License version
19 * 2 along with this work; if not, write to the Free Software Foundation,
20 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
21 *
22 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
23 * or visit www.oracle.com if you need additional information or have any
24 * questions.
25 */
26
27package java.lang;
28
29import java.lang.reflect.Method;
30import libcore.util.EmptyArray;
31
32/**
33 * The {@code Void} class is an uninstantiable placeholder class to hold a
34 * reference to the {@code Class} object representing the Java keyword
35 * void.
36 *
37 * @author  unascribed
38 * @since   JDK1.1
39 */
40public final
41class Void {
42
43    /**
44     * The {@code Class} object representing the pseudo-type corresponding to
45     * the keyword {@code void}.
46     */
47    public static final Class<Void> TYPE = lookupType();
48
49    // Android-changed: Upstream code would use reflection to establish the value of "void.class".
50    // ART makes a native call instead because the reflection approach could lead to initialization
51    // of TYPE with the current, i.e. uninitialized, value of TYPE due to other Android changes.
52    @dalvik.annotation.optimization.FastNative
53    private static native Class<Void> lookupType();
54    /*
55    @SuppressWarnings("unchecked")
56    private static Class<Void> lookupType() {
57        try {
58            Method method = Runnable.class.getMethod("run", EmptyArray.CLASS);
59            return (Class<Void>) method.getReturnType();
60        } catch (Exception e) {
61            throw new AssertionError(e);
62        }
63    }
64    */
65
66    /*
67     * The Void class cannot be instantiated.
68     */
69    private Void() {}
70}
71