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