| /* |
| * 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 |
| */ |
| |
| import java.util.*; |
| import java.util.concurrent.*; |
| import java.util.concurrent.atomic.*; |
| import java.lang.reflect.*; |
| |
| @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");} |
| } |