1 /*
2  * Copyright (c) 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 
24 package p4;
25 
26 import java.io.IOException;
27 import java.io.InputStream;
28 import java.lang.module.ModuleDescriptor;
29 import java.lang.module.ModuleFinder;
30 import java.net.URI;
31 import java.nio.file.FileSystem;
32 import java.nio.file.FileSystems;
33 import java.nio.file.Files;
34 import java.nio.file.Path;
35 import java.util.Map;
36 import java.util.Set;
37 
38 import jdk.internal.module.ModuleInfo;
39 import jdk.internal.module.ModuleInfo.Attributes;
40 
41 public class Main {
hasModuleTarget(InputStream in)42     private static boolean hasModuleTarget(InputStream in) throws IOException {
43         ModuleInfo.Attributes attrs = ModuleInfo.read(in, null);
44         return attrs.target() != null;
45     }
46 
hasModuleTarget(String modName)47     private static boolean hasModuleTarget(String modName) throws IOException {
48         FileSystem fs = FileSystems.newFileSystem(URI.create("jrt:/"), Map.of());
49         Path path = fs.getPath("/", "modules", modName, "module-info.class");
50         try (InputStream in = Files.newInputStream(path)) {
51             return hasModuleTarget(in);
52         }
53     }
54 
55     // the system module plugin by default drops ModuleTarget attribute
56     private static boolean expectModuleTarget = false;
main(String... args)57     public static void main(String... args) throws IOException {
58         if (args.length > 0) {
59             if (!args[0].equals("retainModuleTarget")) {
60                 throw new IllegalArgumentException(args[0]);
61             }
62 
63             expectModuleTarget = true;
64         }
65 
66         // java.base is packaged with ModuleTarget
67         if (!hasModuleTarget("java.base")) {
68             throw new RuntimeException("ModuleTarget absent for java.base");
69         }
70 
71         // verify module-info.class for m1 and m4
72         checkModule("m1", "p1", "p2");
73         checkModule("m4", "p4");
74     }
75 
checkModule(String mn, String... packages)76     private static void checkModule(String mn, String... packages) throws IOException {
77         // verify ModuleDescriptor from the runtime module
78         ModuleDescriptor md = ModuleLayer.boot().findModule(mn).get()
79                                    .getDescriptor();
80         checkModuleDescriptor(md, packages);
81 
82         // verify ModuleDescriptor from module-info.class read from ModuleReader
83         try (InputStream in = ModuleFinder.ofSystem().find(mn).get()
84             .open().open("module-info.class").get()) {
85             checkModuleDescriptor(ModuleDescriptor.read(in), packages);
86         }
87 
88         // verify ModuleDescriptor from module-info.class read from jimage
89         FileSystem fs = FileSystems.newFileSystem(URI.create("jrt:/"), Map.of());
90         Path path = fs.getPath("/", "modules", mn, "module-info.class");
91         checkModuleDescriptor(ModuleDescriptor.read(Files.newInputStream(path)), packages);
92     }
93 
checkModuleDescriptor(ModuleDescriptor md, String... packages)94     static void checkModuleDescriptor(ModuleDescriptor md, String... packages) throws IOException {
95         String mainClass = md.name().replace('m', 'p') + ".Main";
96         if (!md.mainClass().get().equals(mainClass)) {
97             throw new RuntimeException(md.mainClass().toString());
98         }
99 
100         // ModuleTarget attribute should be present
101         if (!hasModuleTarget(md.name())) {
102             throw new RuntimeException("ModuleTarget missing for " + md.name());
103         }
104 
105         Set<String> pkgs = md.packages();
106         if (!pkgs.equals(Set.of(packages))) {
107             throw new RuntimeException(pkgs + " expected: " + Set.of(packages));
108         }
109     }
110 }
111