/*

 * Copyright (c) 2018, 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

 * or visit www.oracle.com if you need additional information or have any

 * questions.

 */

import java.nio.ByteBuffer;

import java.util.concurrent.CompletableFuture;

import java.util.concurrent.CompletionException;

import java.util.concurrent.CompletionStage;

import static org.testng.Assert.assertThrows;

public class Support {

    private Support() { }

    public static void assertCompletesExceptionally(Class<? extends Throwable> clazz,

                                                    CompletionStage<?> stage) {

        CompletableFuture<?> cf =

                CompletableFuture.completedFuture(null).thenCompose(x -> stage);

        assertThrows(clazz, () -> {

            try {

                cf.join();

            } catch (CompletionException e) {

                throw e.getCause();

            }

        });

    }

    public static ByteBuffer fullCopy(ByteBuffer src) {

        ByteBuffer copy = ByteBuffer.allocate(src.capacity());

        int p = src.position();

        int l = src.limit();

        src.clear();

        copy.put(src).position(p).limit(l);

        src.position(p).limit(l);

        return copy;

    }

}