/*
 * Copyright (c) 2022, 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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import java.io.IOException;
import java.nio.channels.FileChannel;
import java.nio.file.Files;
import java.nio.file.Path;

import static java.nio.file.StandardOpenOption.*;

/**
 * Common library for various test file utility functions.
 */
public final class FileChannelUtils {

    public static Path createSparseTempFile(String prefix, String suffix) throws IOException {
        Path file = Files.createTempFile(prefix, suffix);
        Files.delete(file); // need CREATE_NEW to make the file sparse

        FileChannel fc = FileChannel.open(file, CREATE_NEW, SPARSE, WRITE);
        fc.close();
        return file;
    }
}