/*

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 * 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 4091757 6652379 8177809

   @requires os.maxMemory >= 16G

   @summary Basic test for setLastModified method

 */

import java.io.*;

import java.nio.ByteBuffer;

import java.nio.channels.FileChannel;

public class SetLastModified {

    private static void ck(File f, long nt, long rt) throws Exception {

        if (rt == nt) return;

        if ((rt / 10 == nt / 10)

            || (rt / 100 == nt / 100)

            || (rt / 1000 == nt / 1000)

            || (rt / 10000 == (nt / 10000))) {

            System.err.println(f + ": Time set to " + nt

                               + ", rounded down by filesystem to " + rt);

            return;

        }

        if ((rt / 10 == (nt + 5) / 10)

            || (rt / 100 == (nt + 50) / 100)

            || (rt / 1000 == (nt + 500) / 1000)

            || (rt / 10000 == ((nt + 5000) / 10000))) {

            System.err.println(f + ": Time set to " + nt

                               + ", rounded up by filesystem to " + rt);

            return;

        }

        throw new Exception(f + ": Time set to " + nt

                            + ", then read as " + rt);

    }

    public static void main(String[] args) throws Exception {

        File d = new File(System.getProperty("test.dir", "."));

        File d2 = new File(d, "x.SetLastModified.dir");

        File f = new File(d2, "x.SetLastModified");

        long ot, t;

        /* New time: One week ago */

        long nt = System.currentTimeMillis() - 1000 * 60 * 60 * 24 * 7;

        if (f.exists()) f.delete();

        if (d2.exists()) d2.delete();

        if (!d2.mkdir()) {

            throw new Exception("Can't create test directory " + d2);

        }

        boolean threw = false;

        try {

            d2.setLastModified(-nt);

        } catch (IllegalArgumentException x) {

            threw = true;

        }

        if (!threw)

            throw new Exception("setLastModified succeeded with a negative time");

        ot = d2.lastModified();

        if (ot != 0) {

            if (d2.setLastModified(nt)) {

                ck(d2, nt, d2.lastModified());

                d2.setLastModified(ot);

            } else {

                System.err.println("Warning: setLastModified on directories "

                                   + "not supported");

            }

        }

        if (f.exists()) {

            if (!f.delete())

                throw new Exception("Can't delete test file " + f);

        }

        if (f.setLastModified(nt))

            throw new Exception("Succeeded on non-existent file: " + f);

        // set/check last modified on files of size 1, 1GB+1, 2GB+1, ..

        // On Windows we only test with a tiny file as that platform doesn't

        // support sparse files by default and so the test takes too long.

        final long G = 1024L * 1024L * 1024L;

        final long MAX_POSITION =

            System.getProperty("os.name").startsWith("Windows") ? 0L : 3L*G;

        long pos = 0L;

        while (pos <= MAX_POSITION) {

            try (FileChannel fc = new FileOutputStream(f).getChannel()) {

                fc.position(pos).write(ByteBuffer.wrap("x".getBytes()));

            }

            ot = f.lastModified();

            System.out.format("check with file size: %d\n", f.length());

            if (!f.setLastModified(nt))

                throw new Exception("setLastModified failed on file: " + f);

            ck(f, nt, f.lastModified());

            pos += G;

        }

        if (!f.delete()) throw new Exception("Can't delete test file " + f);

        if (!d2.delete()) throw new Exception("Can't delete test directory " + d2);

    }

}