| /* |
| * Copyright (c) 2005, 2010, 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 6324846 |
| * @summary Deque implementations must behave isomorphically |
| * @author Martin Buchholz |
| */ |
| |
| import java.util.ArrayDeque; |
| import java.util.Collection; |
| import java.util.Deque; |
| import java.util.Iterator; |
| import java.util.LinkedList; |
| import java.util.NoSuchElementException; |
| import java.util.concurrent.ConcurrentLinkedDeque; |
| import java.util.concurrent.LinkedBlockingDeque; |
| |
| public class ChorusLine { |
| private interface Tweaker { |
| void run(Deque<Integer> deq); |
| } |
| |
| private static final Tweaker[] tweakers = { |
| new Tweaker() { public void run(Deque<Integer> deq) { |
| for (int i = 0; i < 7; i++) |
| deq.addLast(i); |
| deq.removeFirst(); |
| deq.removeFirst(); |
| deq.addLast(7); |
| deq.addLast(8); |
| Iterator<Integer> it = deq.descendingIterator(); |
| equal(it.next(), 8); |
| it.remove(); |
| |
| try {it.remove();} |
| catch (IllegalStateException e) {pass();} |
| catch (Throwable t) {unexpected(t);} |
| |
| deq.addLast(9); |
| it = deq.descendingIterator(); |
| equal(it.next(), 9); |
| equal(it.next(), 7); |
| it.remove(); |
| |
| try {it.remove();} |
| catch (IllegalStateException e) {pass();} |
| catch (Throwable t) {unexpected(t);} |
| |
| equal(it.next(), 6); |
| |
| System.out.println(deq); |
| }}, |
| new Tweaker() { public void run(Deque<Integer> deq) { |
| deq.clear(); |
| check(deq.isEmpty()); |
| check(deq.size() == 0); |
| check(! deq.iterator().hasNext()); |
| check(! deq.descendingIterator().hasNext()); |
| |
| try {deq.iterator().next(); fail();} |
| catch (NoSuchElementException e) {pass();} |
| catch (Throwable t) {unexpected(t);} |
| |
| try {deq.descendingIterator().next(); fail();} |
| catch (NoSuchElementException e) {pass();} |
| catch (Throwable t) {unexpected(t);} |
| }}, |
| new Tweaker() { public void run(Deque<Integer> deq) { |
| for (int i = 0; i < 11; i++) |
| deq.add(i); |
| Iterator<Integer> it = deq.iterator(); |
| equal(it.next(), 0); |
| equal(it.next(), 1); |
| it.remove(); |
| deq.addFirst(-1); |
| deq.addFirst(-2); |
| it = deq.iterator(); |
| equal(it.next(), -2); |
| equal(it.next(), -1); |
| equal(it.next(), 0); |
| it.remove(); |
| |
| it = deq.descendingIterator(); |
| |
| try {it.remove(); fail();} |
| catch (IllegalStateException e) {pass();} |
| catch (Throwable t) {unexpected(t);} |
| |
| equal(it.next(), 10); |
| it.remove(); |
| |
| try {it.remove(); fail();} |
| catch (IllegalStateException e) {pass();} |
| catch (Throwable t) {unexpected(t);} |
| |
| equal(it.next(), 9); |
| equal(it.next(), 8); |
| it.remove(); |
| System.out.println(deq); |
| }}, |
| new Tweaker() { public void run(Deque<Integer> deq) { |
| while (deq.size() > 1) { |
| Iterator<Integer> it = deq.iterator(); |
| it.next(); it.remove(); |
| it = deq.descendingIterator(); |
| it.next(); it.remove(); |
| } |
| System.out.println(deq); |
| }}}; |
| |
| private static void realMain(String[] args) throws Throwable { |
| Collection<Deque<Integer>> deqs = new ArrayDeque<>(3); |
| deqs.add(new ArrayDeque<Integer>()); |
| deqs.add(new LinkedList<Integer>()); |
| deqs.add(new LinkedBlockingDeque<Integer>()); |
| deqs.add(new ConcurrentLinkedDeque<Integer>()); |
| |
| equal(deqs); |
| |
| for (Tweaker tweaker : tweakers) { |
| for (Deque<Integer> deq : deqs) |
| tweaker.run(deq); |
| equal(deqs); |
| } |
| } |
| |
| private static void equal(Iterable<Deque<Integer>> deqs) { |
| Deque<Integer> prev = null; |
| for (Deque<Integer> deq : deqs) { |
| if (prev != null) { |
| equal(prev.isEmpty(), deq.isEmpty()); |
| equal(prev.size(), deq.size()); |
| equal(prev.toString(), deq.toString()); |
| } |
| prev = deq; |
| } |
| |
| Deque<Iterator<Integer>> its = new ArrayDeque<>(); |
| for (Deque<Integer> deq : deqs) |
| its.addLast(deq.iterator()); |
| equal(its); |
| |
| Deque<Iterator<Integer>> dits = new ArrayDeque<>(); |
| for (Deque<Integer> deq : deqs) |
| dits.addLast(deq.descendingIterator()); |
| equal(dits); |
| } |
| |
| private static void equal(Deque<Iterator<Integer>> its) { |
| Iterator<Integer> it0 = its.remove(); |
| while (it0.hasNext()) { |
| Integer i = it0.next(); |
| for (Iterator<Integer> it : its) |
| equal(it.next(), i); |
| } |
| for (Iterator<Integer> it : its) { |
| check(! it.hasNext()); |
| |
| try {it.next(); fail();} |
| catch (NoSuchElementException e) {pass();} |
| catch (Throwable t) {unexpected(t);} |
| } |
| } |
| |
| //--------------------- 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");} |
| } |