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 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
 *
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 * 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).
 *
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 * 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 8230665
 * @summary Test correct behavior of alignmentOffset()
 */

import java.io.IOException;
import java.nio.MappedByteBuffer;
import java.nio.channels.FileChannel;
import java.nio.file.Files;
import java.nio.file.Path;

public class AlignmentOffset {

    public static void main(String[] args) throws Throwable {
        test();
    }

    private static void test() throws IOException {
        MappedByteBuffer[] mbb = buffers();
        int failures = 0;
        for (MappedByteBuffer bb : mbb) {
            try {
                int offset = bb.alignmentOffset(1, 4);
                if (offset >= 0) {
                    System.out.println("PASSED");
                } else {
                    System.err.println("FAILED "+offset);
                    failures++;
                }
            } catch (UnsupportedOperationException e) {
                System.out.println("Not applicable, UOE thrown: ");
            }
        }
        if (failures > 0) {
            throw new RuntimeException("Test failed");
        }
    }

    private static MappedByteBuffer[] buffers() throws IOException {
        return new MappedByteBuffer[]{
                createMBB(new byte[]{0, 1, 2, 3}),
                createMBB(new byte[]{0, 1, 2, -3,
                    45, 6, 7, 78, 3, -7, 6, 7, -128, 127}),
        };
    }

    private static MappedByteBuffer createMBB(byte[] contents)
        throws IOException {
        Path tempFile = Files.createTempFile("mbb", null);
        tempFile.toFile().deleteOnExit();
        Files.write(tempFile, contents);
        try (FileChannel fc = FileChannel.open(tempFile)) {
            MappedByteBuffer map =
                fc.map(FileChannel.MapMode.READ_ONLY, 0, contents.length);
            map.load();
            return map;
        }
    }
}