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/*
* 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.Comparator;
import java.util.Map;
import java.util.TreeMap;
@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");}
}
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