1 /* 2 * Copyright (c) 2005, 2014, Oracle and/or its affiliates. All rights reserved. 3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. 4 * 5 * This code is free software; you can redistribute it and/or modify it 6 * under the terms of the GNU General Public License version 2 only, as 7 * published by the Free Software Foundation. 8 * 9 * This code is distributed in the hope that it will be useful, but WITHOUT 10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or 11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License 12 * version 2 for more details (a copy is included in the LICENSE file that 13 * accompanied this code). 14 * 15 * You should have received a copy of the GNU General Public License version 16 * 2 along with this work; if not, write to the Free Software Foundation, 17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. 18 * 19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA 20 * or visit www.oracle.com if you need additional information or have any 21 * questions. 22 */ 23 24 /* 25 * @test 26 * @bug 6301085 6192552 6365601 27 * @summary Basic tests for asLifoQueue 28 * @author Martin Buchholz 29 */ 30 31 package test.java.util.Collections; 32 33 import java.util.*; 34 import java.util.concurrent.*; 35 36 public class AsLifoQueue { 37 realMain(String[] args)38 private static void realMain(String[] args) throws Throwable { 39 try { 40 Deque<String> deq = new ArrayDeque<String>(); 41 check(deq.addAll(Arrays.asList("b", "a", "c"))); 42 equal(deq.toString(), "[b, a, c]"); 43 check(deq.add("d")); 44 equal(deq.toString(), "[b, a, c, d]"); 45 Queue<String> q = Collections.asLifoQueue(deq); 46 check(q.add("e")); 47 equal(deq.toString(),"[e, b, a, c, d]"); 48 } catch (Throwable t) { unexpected(t); } 49 50 // Inspired by an excellent bug report by Jason Mehrens 51 try { 52 final Queue<String> q = 53 Collections.asLifoQueue(new LinkedBlockingDeque<String>(3)); 54 check(q.isEmpty()); equal(q.size(), 0); 55 check(q.add("a")); check(! q.isEmpty()); equal(q.size(), 1); 56 check(q.offer("b")); 57 check(q.add("c")); 58 equal(q.size(), 3); 59 check(! q.offer("d")); 60 equal(q.size(), 3); 61 THROWS(IllegalStateException.class, () -> q.add("d")); 62 equal(q.size(), 3); 63 equal(q.toString(), "[c, b, a]"); 64 equal(q.peek(), "c"); 65 equal(q.element(), "c"); 66 equal(q.remove(), "c"); 67 equal(q.poll(), "b"); 68 equal(q.peek(), "a"); 69 equal(q.remove(), "a"); 70 THROWS(NoSuchElementException.class, () -> q.remove()); 71 equal(q.poll(), null); 72 check(q.isEmpty()); 73 equal(q.size(), 0); 74 } catch (Throwable t) { unexpected(t); } 75 76 THROWS(NullPointerException.class, () -> Collections.asLifoQueue(null)); 77 } 78 79 //--------------------- Infrastructure --------------------------- 80 static volatile int passed = 0, failed = 0; pass()81 static void pass() {passed++;} fail()82 static void fail() {failed++; Thread.dumpStack();} fail(String msg)83 static void fail(String msg) {System.out.println(msg); fail();} unexpected(Throwable t)84 static void unexpected(Throwable t) {failed++; t.printStackTrace();} check(boolean cond)85 static void check(boolean cond) {if (cond) pass(); else fail();} equal(Object x, Object y)86 static void equal(Object x, Object y) { 87 if (x == null ? y == null : x.equals(y)) pass(); 88 else fail(x + " not equal to " + y);} main(String[] args)89 public static void main(String[] args) throws Throwable { 90 try {realMain(args);} catch (Throwable t) {unexpected(t);} 91 System.out.printf("%nPassed = %d, failed = %d%n%n", passed, failed); 92 if (failed > 0) throw new AssertionError("Some tests failed");} f()93 interface Fun {void f() throws Throwable;} THROWS(Class<? extends Throwable> k, Fun... fs)94 private static void THROWS(Class<? extends Throwable> k, Fun... fs) { 95 for (Fun f : fs) 96 try { f.f(); fail("Expected " + k.getName() + " not thrown"); } 97 catch (Throwable t) { 98 if (k.isAssignableFrom(t.getClass())) pass(); 99 else unexpected(t);}} 100 } 101