/*

 * Copyright (c) 2017, 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.

 *

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 */

/*

 * @test

 * @bug 8178427

 * @summary NPE in Infer$CheckUpperBounds

 * @compile T8178427.java

 */

import java.util.Map;

import java.util.concurrent.ExecutorService;

import java.util.function.*;

import java.util.stream.*;

abstract class X {

    public interface N<K, V> {

        Stream<V> getValues();

    }

    abstract <K, V> N<K, V> c();

    abstract <T, K, V, M extends N<K, V>> Collector<T, ?, M> f(

            Function<? super T, ? extends K> k,

            Function<? super T, ? extends Stream<? extends V>> v,

            Supplier<M> multimapSupplier);

    void m(Map<String, N<?, ?>> c, ExecutorService s) {

        s.submit(() -> {

            return c.entrySet().parallelStream()

                    .collect(f(Map.Entry::getKey, e -> e.getValue().getValues(), this::c));

        });

    }

}