/*

 * Copyright (c) 2007, 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.

 */

/*

 * @test

 * @bug 5037068

 * @summary Test import/export constructors and methods

 * @author Martin Buchholz

 */

import java.nio.*;

import java.util.*;

public class ImportExport {

    final Random rnd = new Random();

    void equal(byte[] x, byte[] y) {

        check(Arrays.equals(x, y));

    }

    void equal(long[] x, long[] y) {

        check(Arrays.equals(x, y));

    }

    void equal(byte[] bytes, BitSet s) {

        equal(s, BitSet.valueOf(bytes));

        equal(s, BitSet.valueOf(ByteBuffer.wrap(bytes)));

        equal(s, BitSet.valueOf(

                  ByteBuffer.wrap(

                      Arrays.copyOf(bytes, bytes.length + 8 + rnd.nextInt(8)))

                  .order(ByteOrder.LITTLE_ENDIAN)

                  .asLongBuffer()));

    }

    void checkEmptyBitSet(BitSet s) {

        equal(s.toByteArray(), new byte[0]);

        equal(s.toLongArray(), new long[0]);

        check(s.isEmpty());

    }

    void test(String[] args) throws Throwable {

        for (int i = 0; i < 17; i++) {

            byte[] bytes = new byte[i];

            BitSet s = new BitSet();

            equal(bytes, s);

            equal(BitSet.valueOf(bytes).toByteArray(), new byte[0]);

            if (i > 0) {

                int k = rnd.nextInt(i);

                for (int j = 0; j < 8; j++) {

                    bytes[k] |= 1 << j;

                    s.set(8*k+j);

                    equal(bytes, s);

                    byte[] expected = new byte[k+1]; expected[k] = bytes[k];

                    equal(BitSet.valueOf(bytes).toByteArray(), expected);

                    ByteBuffer bb = ByteBuffer.wrap(bytes);

                    bb.position(k);

                    equal(BitSet.valueOf(bb).toByteArray(),

                          new byte[]{bytes[k]});

                }

            }

        }

        for (int i = 0; i < 100; i++) {

            byte[] bytes = new byte[rnd.nextInt(17)];

            for (int j = 0; j < bytes.length; j++)

                bytes[j] = (byte) rnd.nextInt(0x100);

            BitSet s = BitSet.valueOf(bytes);

            byte[] expected = s.toByteArray();

            equal(expected.length, (s.length()+7)/8);

            if (bytes.length == 0)

                continue;

            if (expected.length > 0)

                check(expected[expected.length-1] != 0);

            if (bytes[bytes.length-1] != 0)

                equal(bytes, expected);

            int n = rnd.nextInt(8 * bytes.length);

            equal(s.get(n), ((bytes[n/8] & (1<<(n%8))) != 0));

        }

        for (int i = 0; i < 3; i++) {

            checkEmptyBitSet(BitSet.valueOf(new byte[i]));

            checkEmptyBitSet(BitSet.valueOf(ByteBuffer.wrap(new byte[i])));

            checkEmptyBitSet(BitSet.valueOf(new byte[i*64]));

            checkEmptyBitSet(BitSet.valueOf(ByteBuffer.wrap(new byte[i*64])));

            checkEmptyBitSet(BitSet.valueOf(new long[i]));

            checkEmptyBitSet(BitSet.valueOf(LongBuffer.wrap(new long[i])));

        }

        {

            long[] longs = new long[rnd.nextInt(10)];

            for (int i = 0; i < longs.length; i++)

                longs[i] = rnd.nextLong();

            LongBuffer b1 = LongBuffer.wrap(longs);

            LongBuffer b2 = LongBuffer.allocate(longs.length + 10);

            for (int i = 0; i < b2.limit(); i++)

                b2.put(i, rnd.nextLong());

            int beg = rnd.nextInt(10);

            b2.position(beg);

            b2.put(longs);

            b2.limit(b2.position());

            b2.position(beg);

            BitSet s1 = BitSet.valueOf(longs);

            BitSet s2 = BitSet.valueOf(b1);

            BitSet s3 = BitSet.valueOf(b2);

            equal(s1, s2);

            equal(s1, s3);

            if (longs.length > 0 && longs[longs.length -1] != 0) {

                equal(longs, s1.toLongArray());

                equal(longs, s2.toLongArray());

                equal(longs, s3.toLongArray());

            }

            for (int i = 0; i < 64 * longs.length; i++) {

                equal(s1.get(i), ((longs [i/64] & (1L<<(i%64))) != 0));

                equal(s2.get(i), ((b1.get(i/64) & (1L<<(i%64))) != 0));

                equal(s3.get(i), ((b2.get(b2.position()+i/64) & (1L<<(i%64))) != 0));

            }

        }

    }

    //--------------------- Infrastructure ---------------------------

    volatile int passed = 0, failed = 0;

    void pass() {passed++;}

    void fail() {failed++; Thread.dumpStack();}

    void fail(String msg) {System.err.println(msg); fail();}

    void unexpected(Throwable t) {failed++; t.printStackTrace();}

    void check(boolean cond) {if (cond) pass(); else fail();}

    void equal(Object x, Object y) {

        if (x == null ? y == null : x.equals(y)) pass();

        else fail(x + " not equal to " + y);}

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

        new ImportExport().instanceMain(args);}

    void instanceMain(String[] args) throws Throwable {

        try {test(args);} catch (Throwable t) {unexpected(t);}

        System.out.printf("%nPassed = %d, failed = %d%n%n", passed, failed);

        if (failed > 0) throw new AssertionError("Some tests failed");}

}