| /* |
| * Copyright (c) 2005, 2014, 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 6301085 6192552 6365601 |
| * @summary Basic tests for asLifoQueue |
| * @author Martin Buchholz |
| */ |
| |
| import java.util.*; |
| import java.util.concurrent.*; |
| |
| public class AsLifoQueue { |
| |
| private static void realMain(String[] args) throws Throwable { |
| try { |
| Deque<String> deq = new ArrayDeque<String>(); |
| check(deq.addAll(Arrays.asList("b", "a", "c"))); |
| equal(deq.toString(), "[b, a, c]"); |
| check(deq.add("d")); |
| equal(deq.toString(), "[b, a, c, d]"); |
| Queue<String> q = Collections.asLifoQueue(deq); |
| check(q.add("e")); |
| equal(deq.toString(),"[e, b, a, c, d]"); |
| } catch (Throwable t) { unexpected(t); } |
| |
| // Inspired by an excellent bug report by Jason Mehrens |
| try { |
| final Queue<String> q = |
| Collections.asLifoQueue(new LinkedBlockingDeque<String>(3)); |
| check(q.isEmpty()); equal(q.size(), 0); |
| check(q.add("a")); check(! q.isEmpty()); equal(q.size(), 1); |
| check(q.offer("b")); |
| check(q.add("c")); |
| equal(q.size(), 3); |
| check(! q.offer("d")); |
| equal(q.size(), 3); |
| THROWS(IllegalStateException.class, () -> q.add("d")); |
| equal(q.size(), 3); |
| equal(q.toString(), "[c, b, a]"); |
| equal(q.peek(), "c"); |
| equal(q.element(), "c"); |
| equal(q.remove(), "c"); |
| equal(q.poll(), "b"); |
| equal(q.peek(), "a"); |
| equal(q.remove(), "a"); |
| THROWS(NoSuchElementException.class, () -> q.remove()); |
| equal(q.poll(), null); |
| check(q.isEmpty()); |
| equal(q.size(), 0); |
| } catch (Throwable t) { unexpected(t); } |
| |
| THROWS(NullPointerException.class, () -> Collections.asLifoQueue(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");} |
| interface Fun {void f() throws Throwable;} |
| private static void THROWS(Class<? extends Throwable> k, Fun... fs) { |
| for (Fun f : fs) |
| try { f.f(); fail("Expected " + k.getName() + " not thrown"); } |
| catch (Throwable t) { |
| if (k.isAssignableFrom(t.getClass())) pass(); |
| else unexpected(t);}} |
| } |