/*
 * 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;
    }
}