J. Duke | 319a3b9 | 2007-12-01 00:00:00 +0000 | [diff] [blame^] | 1 | /* |
| 2 | * Copyright 2003-2007 Sun Microsystems, Inc. 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 Sun Microsystems, Inc., 4150 Network Circle, Santa Clara, |
| 20 | * CA 95054 USA or visit www.sun.com if you need additional information or |
| 21 | * have any questions. |
| 22 | */ |
| 23 | |
| 24 | /* |
| 25 | * @test |
| 26 | * @bug 4809442 6366832 4974878 6372554 4890211 6483125 |
| 27 | * @summary Basic test for Collections.reverseOrder |
| 28 | * @author Josh Bloch, Martin Buchholz |
| 29 | */ |
| 30 | |
| 31 | import java.util.*; |
| 32 | import java.io.*; |
| 33 | |
| 34 | public class ReverseOrder2 { |
| 35 | final static int N = 100; |
| 36 | |
| 37 | static void realMain(String[] args) throws Throwable { |
| 38 | check(Collections.reverseOrder() |
| 39 | == Collections.reverseOrder(null)); |
| 40 | |
| 41 | check(Collections.reverseOrder() |
| 42 | == reincarnate(Collections.reverseOrder())); |
| 43 | |
| 44 | check(Collections.reverseOrder(Collections.reverseOrder(cmp)) |
| 45 | == cmp); |
| 46 | |
| 47 | equal(Collections.reverseOrder(cmp), |
| 48 | Collections.reverseOrder(cmp)); |
| 49 | |
| 50 | equal(Collections.reverseOrder(cmp).hashCode(), |
| 51 | Collections.reverseOrder(cmp).hashCode()); |
| 52 | |
| 53 | check(Collections.reverseOrder(cmp).hashCode() != |
| 54 | cmp.hashCode()); |
| 55 | |
| 56 | test(new ArrayList<String>()); |
| 57 | test(new LinkedList<String>()); |
| 58 | test2(new ArrayList<Integer>()); |
| 59 | test2(new LinkedList<Integer>()); |
| 60 | } |
| 61 | |
| 62 | static void test(List<String> list) { |
| 63 | for (int i = 0; i < N; i++) |
| 64 | list.add(String.valueOf(i)); |
| 65 | Collections.shuffle(list); |
| 66 | Collections.sort(list, Collections.reverseOrder(cmp)); |
| 67 | equal(list, golden); |
| 68 | } |
| 69 | |
| 70 | private static Comparator<String> cmp = new Comparator<String> () { |
| 71 | public int compare(String s1, String s2) { |
| 72 | int i1 = Integer.parseInt(s1); |
| 73 | int i2 = Integer.parseInt(s2); |
| 74 | return (i1 < i2 ? Integer.MIN_VALUE : (i1 == i2 ? 0 : 1)); |
| 75 | } |
| 76 | }; |
| 77 | |
| 78 | private final static List<String> golden = new ArrayList<String>(N); |
| 79 | static { |
| 80 | for (int i = N-1; i >= 0; i--) |
| 81 | golden.add(String.valueOf(i)); |
| 82 | } |
| 83 | |
| 84 | static void test2(List<Integer> list) { |
| 85 | for (int i = 0; i < N; i++) |
| 86 | list.add(i); |
| 87 | Collections.shuffle(list); |
| 88 | Collections.sort(list, Collections.reverseOrder(null)); |
| 89 | equal(list, golden2); |
| 90 | } |
| 91 | |
| 92 | private final static List<Integer> golden2 = new ArrayList<Integer>(N); |
| 93 | static { |
| 94 | for (int i = N-1; i >= 0; i--) |
| 95 | golden2.add(i); |
| 96 | } |
| 97 | |
| 98 | //--------------------- Infrastructure --------------------------- |
| 99 | static volatile int passed = 0, failed = 0; |
| 100 | static void pass() {passed++;} |
| 101 | static void fail() {failed++; Thread.dumpStack();} |
| 102 | static void fail(String msg) {System.out.println(msg); fail();} |
| 103 | static void unexpected(Throwable t) {failed++; t.printStackTrace();} |
| 104 | static void check(boolean cond) {if (cond) pass(); else fail();} |
| 105 | static void equal(Object x, Object y) { |
| 106 | if (x == null ? y == null : x.equals(y)) pass(); |
| 107 | else fail(x + " not equal to " + y);} |
| 108 | public static void main(String[] args) throws Throwable { |
| 109 | try {realMain(args);} catch (Throwable t) {unexpected(t);} |
| 110 | System.out.printf("%nPassed = %d, failed = %d%n%n", passed, failed); |
| 111 | if (failed > 0) throw new AssertionError("Some tests failed");} |
| 112 | static byte[] serializedForm(Object obj) { |
| 113 | try { |
| 114 | ByteArrayOutputStream baos = new ByteArrayOutputStream(); |
| 115 | new ObjectOutputStream(baos).writeObject(obj); |
| 116 | return baos.toByteArray(); |
| 117 | } catch (IOException e) {throw new RuntimeException(e);}} |
| 118 | static Object readObject(byte[] bytes) |
| 119 | throws IOException, ClassNotFoundException { |
| 120 | InputStream is = new ByteArrayInputStream(bytes); |
| 121 | return new ObjectInputStream(is).readObject();} |
| 122 | @SuppressWarnings("unchecked") |
| 123 | static <T> T reincarnate(T obj) { |
| 124 | try {return (T) readObject(serializedForm(obj));} |
| 125 | catch (Exception e) {throw new RuntimeException(e);}} |
| 126 | } |