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/*
* DSI utilities
*
* Copyright (C) 2010-2023 Sebastiano Vigna
*
* This program and the accompanying materials are made available under the
* terms of the GNU Lesser General Public License v2.1 or later,
* which is available at
* http://www.gnu.org/licenses/old-licenses/lgpl-2.1-standalone.html,
* or the Apache Software License 2.0, which is available at
* https://www.apache.org/licenses/LICENSE-2.0.
*
* This program 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.
*
* SPDX-License-Identifier: LGPL-2.1-or-later OR Apache-2.0
*/
package it.unimi.dsi.bits;
import static org.junit.Assert.assertEquals;
import static org.junit.Assert.assertFalse;
import static org.junit.Assert.assertTrue;
import org.junit.Test;
public class PrefixFreeTransformationStrategyTest {
@Test
public void testGetBoolean() {
final LongArrayBitVector v = LongArrayBitVector.of(0, 1, 0);
final TransformationStrategy<BitVector> prefixFree = TransformationStrategies.prefixFree();
final BitVector p = prefixFree.toBitVector(v);
assertTrue(p.getBoolean(0));
assertFalse(p.getBoolean(1));
assertTrue(p.getBoolean(2));
assertTrue(p.getBoolean(3));
assertTrue(p.getBoolean(4));
assertFalse(p.getBoolean(5));
assertFalse(p.getBoolean(6));
assertEquals(LongArrayBitVector.of(1, 0, 1, 1, 1, 0, 0), p);
}
@Test
public void testGetLong() {
LongArrayBitVector v = LongArrayBitVector.getInstance();
v.append(0xFFFFFFFFL, 32);
final TransformationStrategy<BitVector> prefixFree = TransformationStrategies.prefixFree();
final BitVector p = prefixFree.toBitVector(v);
assertEquals(0xFFFFFFFFFFFFFFFFL, p.getLong(0, 64));
assertFalse(p.getBoolean(64));
assertEquals(0, p.getLong(64, 64));
v.clear();
v.append(0x0, 32);
assertEquals(0x5555555555555555L, p.getLong(0, 64));
assertEquals(0x5555555555555555L >>> 1, p.getLong(1, 64));
assertFalse(p.getBoolean(64));
v.clear();
v.append(0x3, 32);
assertEquals(0x555555555555555FL, p.getLong(0, 64));
assertEquals(0x5FL, p.getLong(0, 7));
v = LongArrayBitVector.of(0, 0, 0, 0, 1, 1, 1);
assertEquals(LongArrayBitVector.of(1, 0, 1, 0, 1, 0, 1, 0, 1, 1, 1, 1, 1, 1, 0), prefixFree.toBitVector(v));
}
}
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