| /* |
| * Copyright (c) 2016, 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 8024500 8166446 |
| * @run testng SingletonIterator |
| */ |
| |
| import java.util.Collections; |
| import java.util.Iterator; |
| import java.util.NoSuchElementException; |
| import java.util.concurrent.atomic.AtomicInteger; |
| import org.testng.annotations.Test; |
| |
| import static org.testng.Assert.assertEquals; |
| import static org.testng.Assert.assertFalse; |
| import static org.testng.Assert.fail; |
| |
| @Test(groups = "unit") |
| public class SingletonIterator { |
| static void assertIteratorExhausted(Iterator<?> it) { |
| assertFalse(it.hasNext()); |
| try { |
| it.next(); |
| fail("should have thrown NoSuchElementException"); |
| } catch (NoSuchElementException success) { } |
| it.forEachRemaining(e -> { throw new AssertionError("action called incorrectly"); }); |
| } |
| |
| public void testForEachRemaining() { |
| Iterator<String> it = Collections.singleton("TheOne").iterator(); |
| AtomicInteger cnt = new AtomicInteger(0); |
| |
| it.forEachRemaining(s -> { |
| assertEquals("TheOne", s); |
| cnt.incrementAndGet(); |
| }); |
| |
| assertEquals(cnt.get(), 1); |
| assertIteratorExhausted(it); |
| } |
| |
| static class SingletonException extends RuntimeException { } |
| |
| public void testThrowFromForEachRemaining() { |
| Iterator<String> it = Collections.singleton("TheOne").iterator(); |
| |
| try { |
| it.forEachRemaining(s -> { throw new SingletonException(); }); |
| } catch (SingletonException ignore) { } |
| |
| assertIteratorExhausted(it); |
| } |
| } |