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/* |
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* Copyright (c) 2006, Oracle and/or its affiliates. All rights reserved. |
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* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
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* |
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* This code is free software; you can redistribute it and/or modify it |
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* under the terms of the GNU General Public License version 2 only, as |
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* published by the Free Software Foundation. |
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* |
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* This code is distributed in the hope that it will be useful, but WITHOUT |
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or |
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License |
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* version 2 for more details (a copy is included in the LICENSE file that |
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* accompanied this code). |
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* |
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* You should have received a copy of the GNU General Public License version |
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* 2 along with this work; if not, write to the Free Software Foundation, |
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* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. |
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* |
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* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
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* or visit www.oracle.com if you need additional information or have any |
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* questions. |
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*/ |
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|
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/* |
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* @test |
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* @bug 6467933 |
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* @summary Test proper handling of comparators permitting nulls |
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* @author Martin Buchholz |
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*/ |
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|
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import java.util.Comparator; |
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import java.util.Map; |
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import java.util.TreeMap; |
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|
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@SuppressWarnings("unchecked") |
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public class NullPermissiveComparator { |
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|
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static void equal(Map m, String s) { |
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equal(m.toString(), s); |
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} |
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|
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static void realMain(String[] args) throws Throwable { |
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final Comparator nullLow = new Comparator() { |
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public int compare(Object x, Object y) { |
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return x == y ? 0 : |
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x == null ? -1 : |
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y == null ? 1 : |
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((Comparable)x).compareTo(y); }}; |
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|
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final Comparator nullHigh = new Comparator() { |
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public int compare(Object x, Object y) { |
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return x == y ? 0 : |
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x == null ? 1 : |
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y == null ? -1 : |
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((Comparable)x).compareTo(y); }}; |
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|
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TreeMap m = new TreeMap(nullLow); |
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|
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m.put("a", "A"); |
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m.put("b", "B"); |
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m.put("c", "C"); |
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|
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equal(m, "{a=A, b=B, c=C}"); |
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equal(m.headMap("b"), "{a=A}"); |
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equal(m.tailMap("b"), "{b=B, c=C}"); |
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equal(m.headMap(null), "{}"); |
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equal(m.tailMap(null), "{a=A, b=B, c=C}"); |
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|
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m.put(null, "NULL"); |
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|
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equal(m, "{null=NULL, a=A, b=B, c=C}"); |
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equal(m.headMap("b"), "{null=NULL, a=A}"); |
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equal(m.tailMap("b"), "{b=B, c=C}"); |
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equal(m.headMap(null), "{}"); |
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equal(m.tailMap(null), "{null=NULL, a=A, b=B, c=C}"); |
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|
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m = new TreeMap(nullHigh); |
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|
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m.put("a", "A"); |
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m.put("b", "B"); |
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m.put("c", "C"); |
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|
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equal(m, "{a=A, b=B, c=C}"); |
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equal(m.headMap("b"), "{a=A}"); |
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equal(m.tailMap("b"), "{b=B, c=C}"); |
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equal(m.headMap(null), "{a=A, b=B, c=C}"); |
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equal(m.tailMap(null), "{}"); |
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|
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m.put(null, "NULL"); |
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|
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equal(m, "{a=A, b=B, c=C, null=NULL}"); |
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equal(m.headMap("b"), "{a=A}"); |
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equal(m.tailMap("b"), "{b=B, c=C, null=NULL}"); |
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equal(m.headMap(null), "{a=A, b=B, c=C}"); |
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equal(m.tailMap(null), "{null=NULL}"); |
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} |
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|
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//--------------------- Infrastructure --------------------------- |
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static volatile int passed = 0, failed = 0; |
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static void pass() {passed++;} |
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static void fail() {failed++; Thread.dumpStack();} |
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static void fail(String msg) {System.out.println(msg); fail();} |
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static void unexpected(Throwable t) {failed++; t.printStackTrace();} |
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static void check(boolean cond) {if (cond) pass(); else fail();} |
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static void equal(Object x, Object y) { |
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if (x == null ? y == null : x.equals(y)) pass(); |
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else fail(x + " not equal to " + y);} |
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public static void main(String[] args) throws Throwable { |
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try {realMain(args);} catch (Throwable t) {unexpected(t);} |
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System.out.printf("%nPassed = %d, failed = %d%n%n", passed, failed); |
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if (failed > 0) throw new AssertionError("Some tests failed");} |
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} |
