/*

 * Copyright (c) 2006, 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 6467933

 * @summary Test proper handling of comparators permitting nulls

 * @author Martin Buchholz

 */

@SuppressWarnings("unchecked")

public class NullPermissiveComparator {

    static void equal(Map m, String s) {

        equal(m.toString(), s);

    }

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

        final Comparator nullLow = new Comparator() {

                public int compare(Object x, Object y) {

                    return x == y ?  0 :

                        x == null ? -1 :

                        y == null ?  1 :

                        ((Comparable)x).compareTo(y); }};

        final Comparator nullHigh = new Comparator() {

                public int compare(Object x, Object y) {

                    return x == y ?  0 :

                        x == null ?  1 :

                        y == null ? -1 :

                        ((Comparable)x).compareTo(y); }};

        TreeMap m = new TreeMap(nullLow);

        m.put("a", "A");

        m.put("b", "B");

        m.put("c", "C");

        equal(m, "{a=A, b=B, c=C}");

        equal(m.headMap("b"), "{a=A}");

        equal(m.tailMap("b"), "{b=B, c=C}");

        equal(m.headMap(null), "{}");

        equal(m.tailMap(null), "{a=A, b=B, c=C}");

        m.put(null, "NULL");

        equal(m, "{null=NULL, a=A, b=B, c=C}");

        equal(m.headMap("b"), "{null=NULL, a=A}");

        equal(m.tailMap("b"), "{b=B, c=C}");

        equal(m.headMap(null), "{}");

        equal(m.tailMap(null), "{null=NULL, a=A, b=B, c=C}");

        m = new TreeMap(nullHigh);

        m.put("a", "A");

        m.put("b", "B");

        m.put("c", "C");

        equal(m, "{a=A, b=B, c=C}");

        equal(m.headMap("b"), "{a=A}");

        equal(m.tailMap("b"), "{b=B, c=C}");

        equal(m.headMap(null), "{a=A, b=B, c=C}");

        equal(m.tailMap(null), "{}");

        m.put(null, "NULL");

        equal(m, "{a=A, b=B, c=C, null=NULL}");

        equal(m.headMap("b"), "{a=A}");

        equal(m.tailMap("b"), "{b=B, c=C, null=NULL}");

        equal(m.headMap(null), "{a=A, b=B, c=C}");

        equal(m.tailMap(null), "{null=NULL}");

    }

    //--------------------- 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");}

}