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/* |
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* Copyright (c) 2003, 2007, Oracle and/or its affiliates. All rights reserved. |
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* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
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* |
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* This code is free software; you can redistribute it and/or modify it |
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* under the terms of the GNU General Public License version 2 only, as |
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* published by the Free Software Foundation. |
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* |
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* This code is distributed in the hope that it will be useful, but WITHOUT |
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or |
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License |
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* version 2 for more details (a copy is included in the LICENSE file that |
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* accompanied this code). |
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* |
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* You should have received a copy of the GNU General Public License version |
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* 2 along with this work; if not, write to the Free Software Foundation, |
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* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. |
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* |
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* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
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* or visit www.oracle.com if you need additional information or have any |
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* questions. |
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*/ |
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|
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/* |
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* @test |
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* @bug 4809442 6366832 4974878 6372554 4890211 6483125 |
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* @summary Basic test for Collections.reverseOrder |
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* @author Josh Bloch, Martin Buchholz |
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*/ |
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|
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import java.io.ByteArrayInputStream; |
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import java.io.ByteArrayOutputStream; |
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import java.io.IOException; |
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import java.io.InputStream; |
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import java.io.ObjectInputStream; |
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import java.io.ObjectOutputStream; |
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import java.util.ArrayList; |
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import java.util.Collections; |
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import java.util.Comparator; |
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import java.util.LinkedList; |
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import java.util.List; |
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|
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public class ReverseOrder2 { |
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static final int N = 100; |
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|
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static void realMain(String[] args) throws Throwable { |
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check(Collections.reverseOrder() |
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== Collections.reverseOrder(null)); |
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|
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check(Collections.reverseOrder() |
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== reincarnate(Collections.reverseOrder())); |
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|
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check(Collections.reverseOrder(Collections.reverseOrder(cmp)) |
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== cmp); |
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|
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equal(Collections.reverseOrder(cmp), |
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Collections.reverseOrder(cmp)); |
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|
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equal(Collections.reverseOrder(cmp).hashCode(), |
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Collections.reverseOrder(cmp).hashCode()); |
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|
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check(Collections.reverseOrder(cmp).hashCode() != |
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cmp.hashCode()); |
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|
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test(new ArrayList<String>()); |
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test(new LinkedList<String>()); |
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test2(new ArrayList<Integer>()); |
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test2(new LinkedList<Integer>()); |
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} |
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|
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static void test(List<String> list) { |
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for (int i = 0; i < N; i++) |
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list.add(String.valueOf(i)); |
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Collections.shuffle(list); |
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Collections.sort(list, Collections.reverseOrder(cmp)); |
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equal(list, golden); |
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} |
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|
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private static Comparator<String> cmp = new Comparator<>() { |
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public int compare(String s1, String s2) { |
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int i1 = Integer.parseInt(s1); |
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int i2 = Integer.parseInt(s2); |
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return (i1 < i2 ? Integer.MIN_VALUE : (i1 == i2 ? 0 : 1)); |
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} |
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}; |
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|
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private static final List<String> golden = new ArrayList<>(N); |
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static { |
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for (int i = N-1; i >= 0; i--) |
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golden.add(String.valueOf(i)); |
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} |
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|
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static void test2(List<Integer> list) { |
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for (int i = 0; i < N; i++) |
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list.add(i); |
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Collections.shuffle(list); |
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Collections.sort(list, Collections.reverseOrder(null)); |
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equal(list, golden2); |
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} |
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|
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private static final List<Integer> golden2 = new ArrayList<>(N); |
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static { |
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for (int i = N-1; i >= 0; i--) |
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golden2.add(i); |
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} |
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|
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//--------------------- Infrastructure --------------------------- |
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static volatile int passed = 0, failed = 0; |
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static void pass() {passed++;} |
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static void fail() {failed++; Thread.dumpStack();} |
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static void fail(String msg) {System.out.println(msg); fail();} |
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static void unexpected(Throwable t) {failed++; t.printStackTrace();} |
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static void check(boolean cond) {if (cond) pass(); else fail();} |
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static void equal(Object x, Object y) { |
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if (x == null ? y == null : x.equals(y)) pass(); |
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else fail(x + " not equal to " + y);} |
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public static void main(String[] args) throws Throwable { |
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try {realMain(args);} catch (Throwable t) {unexpected(t);} |
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System.out.printf("%nPassed = %d, failed = %d%n%n", passed, failed); |
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if (failed > 0) throw new AssertionError("Some tests failed");} |
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static byte[] serializedForm(Object obj) { |
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try { |
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ByteArrayOutputStream baos = new ByteArrayOutputStream(); |
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new ObjectOutputStream(baos).writeObject(obj); |
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return baos.toByteArray(); |
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} catch (IOException e) {throw new RuntimeException(e);}} |
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static Object readObject(byte[] bytes) |
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throws IOException, ClassNotFoundException { |
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InputStream is = new ByteArrayInputStream(bytes); |
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return new ObjectInputStream(is).readObject();} |
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@SuppressWarnings("unchecked") |
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static <T> T reincarnate(T obj) { |
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try {return (T) readObject(serializedForm(obj));} |
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catch (Exception e) {throw new RuntimeException(e);}} |
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} |
