test/jdk/lib/testlibrary/ModuleUtils.java
author erikj
Tue, 12 Sep 2017 19:03:39 +0200
changeset 47216 71c04702a3d5
parent 42703 jdk/test/lib/testlibrary/ModuleUtils.java@20c39ea4a507
permissions -rw-r--r--
8187443: Forest Consolidation: Move files to unified layout Reviewed-by: darcy, ihse
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/*
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 * Copyright (c) 2015, Oracle and/or its affiliates. All rights reserved.
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 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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 *
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 * This code is free software; you can redistribute it and/or modify it
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 * under the terms of the GNU General Public License version 2 only, as
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 * published by the Free Software Foundation.
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 *
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 * This code is distributed in the hope that it will be useful, but WITHOUT
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 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
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 * version 2 for more details (a copy is included in the LICENSE file that
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 * accompanied this code).
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 *
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 * You should have received a copy of the GNU General Public License version
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 * 2 along with this work; if not, write to the Free Software Foundation,
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 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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 *
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 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
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 * or visit www.oracle.com if you need additional information or have any
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 * questions.
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 */
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import java.lang.module.ModuleDescriptor;
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import java.lang.module.ModuleFinder;
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import java.lang.module.ModuleReader;
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import java.lang.module.ModuleReference;
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import java.net.URI;
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import java.util.HashMap;
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import java.util.HashSet;
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import java.util.Map;
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import java.util.Objects;
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import java.util.Optional;
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import java.util.Set;
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/**
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 * This class consists exclusively of static utility methods that are useful
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 * for creating tests for modules.
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 */
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public final class ModuleUtils {
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    private ModuleUtils() { }
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    /**
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     * Returns a ModuleFinder that finds modules with the given module
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     * descriptors.
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     */
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    static ModuleFinder finderOf(ModuleDescriptor... descriptors) {
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        // Create a ModuleReference for each module
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        Map<String, ModuleReference> namesToReference = new HashMap<>();
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        for (ModuleDescriptor descriptor : descriptors) {
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            String name = descriptor.name();
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            URI uri = URI.create("module:/" + name);
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            ModuleReference mref = new ModuleReference(descriptor, uri) {
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                @Override
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                public ModuleReader open() {
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                    throw new UnsupportedOperationException();
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                }
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            };
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            namesToReference.put(name, mref);
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        }
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        return new ModuleFinder() {
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            @Override
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            public Optional<ModuleReference> find(String name) {
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                Objects.requireNonNull(name);
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                return Optional.ofNullable(namesToReference.get(name));
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            }
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            @Override
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            public Set<ModuleReference> findAll() {
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                return new HashSet<>(namesToReference.values());
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            }
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        };
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    }
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}