| /* |
| * Copyright (c) 2005, 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 5018254 |
| * @summary Test null-allowing Comparators |
| * @author Martin Buchholz |
| */ |
| |
| import java.util.*; |
| import java.util.concurrent.*; |
| |
| public class NullAtEnd { |
| static volatile int passed = 0, failed = 0; |
| |
| static void fail(String msg) { |
| failed++; |
| new AssertionError(msg).printStackTrace(); |
| } |
| |
| static void pass() { |
| passed++; |
| } |
| |
| static void unexpected(Throwable t) { |
| failed++; |
| t.printStackTrace(); |
| } |
| |
| static void check(boolean condition, String msg) { |
| if (condition) |
| passed++; |
| else |
| fail(msg); |
| } |
| |
| static void check(boolean condition) { |
| check(condition, "Assertion failure"); |
| } |
| |
| private static boolean eq(Object x, Object y) { |
| return x == null ? y == null : x.equals(y); |
| } |
| |
| private static final Comparator<String> NULL_AT_END |
| = new Comparator<String>() { |
| /** |
| * Allows for nulls. Null is greater than anything non-null. |
| */ |
| public int compare(String x, String y) { |
| if (x == null && y == null) return 0; |
| if (x == null && y != null) return 1; |
| if (x != null && y == null) return -1; |
| return x.compareTo(y); |
| } |
| }; |
| |
| public static void main(String[] args) { |
| try { |
| SortedMap<String,String> m1 |
| = new TreeMap<String,String>(NULL_AT_END); |
| check(eq(m1.put("a", "a"), null)); |
| check(eq(m1.put("b", "b"), null)); |
| check(eq(m1.put("c", "c"), null)); |
| check(eq(m1.put(null, "d"), null)); |
| |
| SortedMap<String,String> m2 = new TreeMap<String,String>(m1); |
| |
| check(eq(m1.lastKey(), null)); |
| check(eq(m1.get(m1.lastKey()), "d")); |
| check(eq(m1.remove(m1.lastKey()), "d")); |
| check(eq(m1.lastKey(), "c")); |
| |
| check(eq(m2.entrySet().toString(), "[a=a, b=b, c=c, null=d]")); |
| |
| SortedMap<String,String> m3 = m2.tailMap("b"); |
| |
| check(eq(m3.lastKey(), null)); |
| check(eq(m3.get(m3.lastKey()), "d")); |
| check(eq(m3.remove(m3.lastKey()), "d")); |
| check(eq(m3.lastKey(), "c")); |
| |
| } catch (Throwable t) { unexpected(t); } |
| |
| System.out.printf("%nPassed = %d, failed = %d%n%n", passed, failed); |
| if (failed > 0) throw new Error("Some tests failed"); |
| } |
| } |