openjdk/test/jdk/java/util/BitSet/ImmutableBitSet.java
Per Minborg f292268268 8315454: Add a way to create an immutable snapshot of a BitSet
Co-authored-by: Claes Redestad <redestad@openjdk.org>
Reviewed-by: redestad
2023-09-05 06:43:00 +00:00

92 lines
2.8 KiB
Java

/*
* Copyright (c) 2023, 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
* @summary Basic tests of immutable BitSets
* @modules java.base/jdk.internal.util
* @run junit ImmutableBitSet
*/
import jdk.internal.util.ImmutableBitSetPredicate;
import org.junit.jupiter.api.Test;
import java.util.BitSet;
import java.util.Random;
import java.util.function.IntPredicate;
import static org.junit.jupiter.api.Assertions.*;
public class ImmutableBitSet {
@Test
void empty() {
BitSet bs = new BitSet();
IntPredicate ibs = ImmutableBitSetPredicate.of(bs);
test(bs, ibs);
}
@Test
void negativeIndex() {
BitSet bs = new BitSet();
IntPredicate ibs = ImmutableBitSetPredicate.of(bs);
assertThrows(IndexOutOfBoundsException.class, () -> {
ibs.test(-1);
});
}
@Test
void basic() {
BitSet bs = createReference(147);
IntPredicate ibs = ImmutableBitSetPredicate.of(bs);
test(bs, ibs);
}
@Test
void clearedAtTheTail() {
for (int i = Long.BYTES - 1; i < Long.BYTES + 2; i++) {
BitSet bs = createReference(i);
for (int j = bs.length() - 1; j > Long.BYTES - 1; j++) {
bs.clear(j);
}
IntPredicate ibs = ImmutableBitSetPredicate.of(bs);
test(bs, ibs);
}
}
static void test(BitSet expected, IntPredicate actual) {
for (int i = 0; i < expected.length() + 17; i++) {
assertEquals(expected.get(i), actual.test(i), "at index " + i);
}
}
private static BitSet createReference(int length) {
BitSet result = new BitSet();
Random random = new Random(length);
for (int i = 0; i < length; i++) {
result.set(i, random.nextBoolean());
}
return result;
}
}