/*

 * Copyright (c) 2016, Oracle and/or its affiliates. All rights reserved.

 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.

 *

 * This code is free software; you can redistribute it and/or modify it

 * under the terms of the GNU General Public License version 2 only, as

 * published by the Free Software Foundation.

 *

 * This code is distributed in the hope that it will be useful, but WITHOUT

 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or

 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License

 * version 2 for more details (a copy is included in the LICENSE file that

 * accompanied this code).

 *

 * You should have received a copy of the GNU General Public License version

 * 2 along with this work; if not, write to the Free Software Foundation,

 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.

 *

 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA

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 */

import java.lang.module.ModuleDescriptor;

import java.lang.module.ModuleDescriptor.Requires.Modifier;

import java.lang.module.ModuleFinder;

import java.lang.module.ModuleReference;

import java.util.Collections;

import java.util.EnumSet;

import java.util.Map;

import java.util.Set;

import jdk.internal.misc.JavaLangModuleAccess;

import jdk.internal.misc.SharedSecrets;

import org.testng.annotations.Test;

import static org.testng.Assert.*;

/**

 * @test

 * @modules java.base/jdk.internal.misc

 * @summary Verify the properties of ModuleDescriptor created

 */

    private static final JavaLangModuleAccess jlma = SharedSecrets.getJavaLangModuleAccess();

    /**

     * Verify ModuleDescriptor contains unmodifiable sets

     */

    @Test

    public void testUnmodifableDescriptors() throws Exception {

        ModuleFinder.ofSystem().findAll()

                    .stream()

                    .map(ModuleReference::descriptor)

                    .forEach(this::testModuleDescriptor);

    }

    private void testModuleDescriptor(ModuleDescriptor md) {

        assertUnmodifiable(md.conceals(), "conceal");

        assertUnmodifiable(md.packages(), "package");

        assertUnmodifiable(md.requires(),

                           jlma.newRequires(EnumSet.allOf(Modifier.class), "require"));

        assertUnmodifiable(md.exports(), jlma.newExports("export"));

        assertUnmodifiable(md.uses(), "use");

        assertUnmodifiable(md.provides(), "provide",

                           jlma.newProvides("provide", Collections.singleton("provide")));

    }

    private <T> void assertUnmodifiable(Set<T> set, T dummy) {

        try {

            set.add(dummy);

            fail("Should throw UnsupportedOperationException");

        } catch (UnsupportedOperationException e) {

            // pass

        } catch (Exception e) {

            fail("Should throw UnsupportedOperationException");

        }

    }

    private <T, V> void assertUnmodifiable(Map<T, V> set, T dummyKey, V dummyValue) {

        try {

            set.put(dummyKey, dummyValue);

            fail("Should throw UnsupportedOperationException");

        } catch (UnsupportedOperationException e) {

            // pass

        } catch (Exception e) {

            fail("Should throw UnsupportedOperationException");

        }

    }

}