1/*
2 * Copyright (c) 2015, 2017, Oracle and/or its affiliates. All rights reserved.
3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
4 *
5 * This code is free software; you can redistribute it and/or modify it
6 * under the terms of the GNU General Public License version 2 only, as
7 * published by the Free Software Foundation.
8 *
9 * This code is distributed in the hope that it will be useful, but WITHOUT
10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
11 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
12 * version 2 for more details (a copy is included in the LICENSE file that
13 * accompanied this code).
14 *
15 * You should have received a copy of the GNU General Public License version
16 * 2 along with this work; if not, write to the Free Software Foundation,
17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
18 *
19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
20 * or visit www.oracle.com if you need additional information or have any
21 * questions.
22 */
23
24package java.lang;
25
26import java.lang.module.ModuleDescriptor;
27
28/**
29 * A helper class intended to be injected into java.lang using the
30 * java --patch-module option. The helper class provides access to package private
31 * methods in java.lang.Module.
32 */
33
34public final class ModuleHelper {
35
36    private ModuleHelper() { }
37
38    /**
39     * Creates a named module but without defining the module to the VM.
40     */
41    public static Module newModule(ClassLoader loader, ModuleDescriptor descriptor) {
42        return new Module(loader, descriptor);
43    }
44
45    /**
46     * Updates module {@code from} to that it reads module {@code to} without
47     * notifying the VM.
48     */
49    public static void addReadsNoSync(Module from, Module to) {
50        from.implAddReadsNoSync(to);
51    }
52
53    /**
54     * Updates module {@code from} so that it exports package {@code pkg}
55     * to module {@code to} but without notifying the VM. If {@code to} is
56     * {@code null} then the package is exported unconditionally.
57     */
58    public static void addExportsNoSync(Module from, String pkg, Module to) {
59        if (to == null) {
60            from.implAddExportsNoSync(pkg);
61        } else {
62            from.implAddExportsNoSync(pkg, to);
63        }
64    }
65
66}
67