/*

 * Copyright (c) 2003, 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     4809442 6366832 4974878 6372554 4890211 6483125

 * @summary Basic test for Collections.reverseOrder

 * @author  Josh Bloch, Martin Buchholz

 */

import java.util.*;

import java.io.*;

public class ReverseOrder2 {

    static void realMain(String[] args) throws Throwable {

        check(Collections.reverseOrder()

              == Collections.reverseOrder(null));

        check(Collections.reverseOrder()

              == reincarnate(Collections.reverseOrder()));

        check(Collections.reverseOrder(Collections.reverseOrder(cmp))

              == cmp);

        equal(Collections.reverseOrder(cmp),

              Collections.reverseOrder(cmp));

        equal(Collections.reverseOrder(cmp).hashCode(),

              Collections.reverseOrder(cmp).hashCode());

        check(Collections.reverseOrder(cmp).hashCode() !=

              cmp.hashCode());

        test(new ArrayList<String>());

        test(new LinkedList<String>());

        test2(new ArrayList<Integer>());

        test2(new LinkedList<Integer>());

    }

    static void test(List<String> list) {

        for (int i = 0; i < N; i++)

            list.add(String.valueOf(i));

        Collections.shuffle(list);

        Collections.sort(list, Collections.reverseOrder(cmp));

        equal(list, golden);

    }

    private static Comparator<String> cmp = new Comparator<String> () {

        public int compare(String s1, String s2) {

            int i1 = Integer.parseInt(s1);

            int i2 = Integer.parseInt(s2);

            return (i1 < i2 ? Integer.MIN_VALUE : (i1 == i2 ? 0 : 1));

        }

    };

    static {

        for (int i = N-1; i >= 0; i--)

            golden.add(String.valueOf(i));

    }

    static void test2(List<Integer> list) {

        for (int i = 0; i < N; i++)

            list.add(i);

        Collections.shuffle(list);

        Collections.sort(list, Collections.reverseOrder(null));

        equal(list, golden2);

    }

    static {

        for (int i = N-1; i >= 0; i--)

            golden2.add(i);

    }

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

    static volatile int passed = 0, failed = 0;

    static void pass() {passed++;}

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

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

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

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

    static 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 {

        try {realMain(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");}

    static byte[] serializedForm(Object obj) {

        try {

            ByteArrayOutputStream baos = new ByteArrayOutputStream();

            new ObjectOutputStream(baos).writeObject(obj);

            return baos.toByteArray();

        } catch (IOException e) {throw new RuntimeException(e);}}

    static Object readObject(byte[] bytes)

        throws IOException, ClassNotFoundException {

        InputStream is = new ByteArrayInputStream(bytes);

        return new ObjectInputStream(is).readObject();}

    @SuppressWarnings("unchecked")

    static <T> T reincarnate(T obj) {

        try {return (T) readObject(serializedForm(obj));}

        catch (Exception e) {throw new RuntimeException(e);}}

}