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 import java.lang.module.ModuleDescriptor;

    25 import java.lang.module.ModuleFinder;

    26 import java.lang.module.ModuleReader;

    27 import java.lang.module.ModuleReference;

    28 import java.net.URI;

    29 import java.util.HashMap;

    30 import java.util.HashSet;

    31 import java.util.Map;

    32 import java.util.Objects;

    33 import java.util.Optional;

    34 import java.util.Set;

    35 

    36 

    37 /**

    38  * This class consists exclusively of static utility methods that are useful

    39  * for creating tests for modules.

    40  */

    41 

    42 public final class ModuleUtils {

    43     private ModuleUtils() { }

    44 

    45 

    46     /**

    47      * Returns a ModuleFinder that finds modules with the given module

    48      * descriptors.

    49      */

    50     static ModuleFinder finderOf(ModuleDescriptor... descriptors) {

    51 

    52         // Create a ModuleReference for each module

    53         Map<String, ModuleReference> namesToReference = new HashMap<>();

    54 

    55         for (ModuleDescriptor descriptor : descriptors) {

    56             String name = descriptor.name();

    57 

    58             URI uri = URI.create("module:/" + name);

    59 

    60             ModuleReference mref = new ModuleReference(descriptor, uri) {

    61                 @Override

    62                 public ModuleReader open() {

    63                     throw new UnsupportedOperationException();

    64                 }

    65             };

    66 

    67             namesToReference.put(name, mref);

    68         }

    69 

    70         return new ModuleFinder() {

    71             @Override

    72             public Optional<ModuleReference> find(String name) {

    73                 Objects.requireNonNull(name);

    74                 return Optional.ofNullable(namesToReference.get(name));

    75             }

    76             @Override

    77             public Set<ModuleReference> findAll() {

    78                 return new HashSet<>(namesToReference.values());

    79             }

    80         };

    81     }

    82 

    83 }