1 /*
2  * Copyright (c) 2015, 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 jdk.test.lib.util;
25 
26 import java.lang.module.ModuleDescriptor;
27 import java.lang.module.ModuleFinder;
28 import java.lang.module.ModuleReader;
29 import java.lang.module.ModuleReference;
30 import java.net.URI;
31 import java.util.HashMap;
32 import java.util.HashSet;
33 import java.util.Map;
34 import java.util.Objects;
35 import java.util.Optional;
36 import java.util.Set;
37 
38 
39 /**
40  * This class consists exclusively of static utility methods that are useful
41  * for creating tests for modules.
42  */
43 
44 public final class ModuleUtils {
ModuleUtils()45     private ModuleUtils() { }
46 
47 
48     /**
49      * Returns a ModuleFinder that finds modules with the given module
50      * descriptors.
51      */
finderOf(ModuleDescriptor... descriptors)52     public static ModuleFinder finderOf(ModuleDescriptor... descriptors) {
53 
54         // Create a ModuleReference for each module
55         Map<String, ModuleReference> namesToReference = new HashMap<>();
56 
57         for (ModuleDescriptor descriptor : descriptors) {
58             String name = descriptor.name();
59 
60             URI uri = URI.create("module:/" + name);
61 
62             ModuleReference mref = new ModuleReference(descriptor, uri) {
63                 @Override
64                 public ModuleReader open() {
65                     throw new UnsupportedOperationException();
66                 }
67             };
68 
69             namesToReference.put(name, mref);
70         }
71 
72         return new ModuleFinder() {
73             @Override
74             public Optional<ModuleReference> find(String name) {
75                 Objects.requireNonNull(name);
76                 return Optional.ofNullable(namesToReference.get(name));
77             }
78             @Override
79             public Set<ModuleReference> findAll() {
80                 return new HashSet<>(namesToReference.values());
81             }
82         };
83     }
84 
85 }
86