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/* |
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* Copyright (c) 2006, 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 5045582 |
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* @summary binarySearch of Collections larger than 1<<30 |
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* @author Martin Buchholz |
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*/ |
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|
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import java.util.AbstractList; |
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import java.util.Collections; |
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import java.util.Comparator; |
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import java.util.HashMap; |
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import java.util.List; |
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import java.util.Map; |
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import java.util.RandomAccess; |
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|
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public class BigBinarySearch { |
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|
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// Allows creation of very "big" collections without using too |
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// many real resources |
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static class SparseIntegerList |
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extends AbstractList<Integer> |
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implements RandomAccess |
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{ |
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private Map<Integer,Integer> m = new HashMap<>(); |
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|
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public Integer get(int i) { |
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if (i < 0) throw new IndexOutOfBoundsException(""+i); |
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Integer v = m.get(i); |
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return (v == null) ? Integer.valueOf(0) : v; |
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} |
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|
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public int size() { |
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return Collections.max(m.keySet()) + 1; |
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} |
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|
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public Integer set(int i, Integer v) { |
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if (i < 0) throw new IndexOutOfBoundsException(""+i); |
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Integer ret = get(i); |
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if (v == 0) |
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m.remove(i); |
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else |
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m.put(i, v); |
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return ret; |
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} |
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} |
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|
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/** Checks that binarySearch finds an element where we got it. */ |
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private static void checkBinarySearch(List<Integer> l, int i) { |
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try { equal(i, Collections.binarySearch(l, l.get(i))); } |
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catch (Throwable t) { unexpected(t); } |
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} |
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|
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/** Checks that binarySearch finds an element where we got it. */ |
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private static void checkBinarySearch(List<Integer> l, int i, |
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Comparator<Integer> comparator) { |
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try { equal(i, Collections.binarySearch(l, l.get(i), comparator)); } |
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catch (Throwable t) { unexpected(t); } |
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} |
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|
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private static void realMain(String[] args) throws Throwable { |
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final int n = (1<<30) + 47; |
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|
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System.out.println("binarySearch(List<Integer>, Integer)"); |
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List<Integer> big = new SparseIntegerList(); |
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big.set( 0, -44); |
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big.set( 1, -43); |
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big.set(n-2, 43); |
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big.set(n-1, 44); |
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int[] ints = { 0, 1, n-2, n-1 }; |
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Comparator<Integer> reverse = Collections.reverseOrder(); |
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Comparator<Integer> natural = Collections.reverseOrder(reverse); |
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|
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for (int i : ints) { |
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checkBinarySearch(big, i); |
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checkBinarySearch(big, i, null); |
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checkBinarySearch(big, i, natural); |
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} |
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for (int i : ints) |
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big.set(i, - big.get(i)); |
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for (int i : ints) |
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checkBinarySearch(big, i, reverse); |
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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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} |
