test.it.unimi.dsi.bits.BitVectorsTest Maven / Gradle / Ivy

Go to download

Show more of this group Show more artifacts with this name
Show all versions of dsiutils Show documentation

The DSI utilities are a mishmash of classes accumulated during the last twenty years in projects developed at the DSI (Dipartimento di Scienze dell'Informazione, i.e., Information Sciences Department), now DI (Dipartimento di Informatica, i.e., Informatics Department), of the Universita` degli Studi di Milano.

There is a newer version: 2.7.3

Show newest version

/*
 * DSI utilities
 *
 * Copyright (C) 2010-2020 Sebastiano Vigna
 *
 *  This library is free software; you can redistribute it and/or modify it
 *  under the terms of the GNU Lesser General Public License as published by the Free
 *  Software Foundation; either version 3 of the License, or (at your option)
 *  any later version.
 *
 *  This library 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 Lesser General Public License
 *  for more details.
 *
 *  You should have received a copy of the GNU Lesser General Public License
 *  along with this program; if not, see .
 *
 */

package it.unimi.dsi.bits;

import static org.junit.Assert.assertEquals;
import static org.junit.Assert.assertFalse;

import java.io.DataInputStream;
import java.io.DataOutputStream;
import java.io.IOException;
import java.util.Arrays;
import java.util.Iterator;

import org.junit.Test;

import it.unimi.dsi.fastutil.io.FastByteArrayInputStream;
import it.unimi.dsi.fastutil.io.FastByteArrayOutputStream;
import it.unimi.dsi.io.OfflineIterable;

public class BitVectorsTest {

	@Test
	public void testReadWriteFast() throws IOException {
		final FastByteArrayOutputStream fbaos = new FastByteArrayOutputStream();
		final DataOutputStream dos = new DataOutputStream(fbaos);
		final LongArrayBitVector labv = LongArrayBitVector.getInstance();
		final BitVector[] a = new BitVector[] { BitVectors.ZERO, BitVectors.ONE, BitVectors.EMPTY_VECTOR,
				LongArrayBitVector.wrap(new long[] { 0xAAAAAAAAAAAAAAAAL }, 64),
				LongArrayBitVector.wrap(new long[] { 0xAAAAAAAAAAAAAAAL }, 60),
				LongArrayBitVector.wrap(new long[] { 0xAAAAAAAAAAAAAAAAL, 0xAAAAAAAAAAAAAAAAL }, 128),
				LongArrayBitVector.wrap(new long[] { 0xAAAAAAAAAAAAAAAAL, 0xAAAAAAAAAAAAAAAL }, 124) };

		for(final BitVector bv: a) {
			BitVectors.writeFast(bv, dos);
			dos.close();
			assertEquals(bv, BitVectors.readFast(new DataInputStream(new FastByteArrayInputStream(fbaos.array))));
			fbaos.reset();
		}

		for(final BitVector bv: a) {
			BitVectors.writeFast(bv, dos);
			dos.close();
			assertEquals(bv, BitVectors.readFast(new DataInputStream(new FastByteArrayInputStream(fbaos.array)), labv));
			fbaos.reset();
		}
	}

	@Test
	public void testMakeOffline() throws IOException {
		final BitVector[] a = new BitVector[] { BitVectors.ZERO, BitVectors.ONE, BitVectors.EMPTY_VECTOR,
				LongArrayBitVector.wrap(new long[] { 0xAAAAAAAAAAAAAAAAL }, 64),
				LongArrayBitVector.wrap(new long[] { 0xAAAAAAAAAAAAAAAL }, 60),
				LongArrayBitVector.wrap(new long[] { 0xAAAAAAAAAAAAAAAAL, 0xAAAAAAAAAAAAAAAAL }, 128),
				LongArrayBitVector.wrap(new long[] { 0xAAAAAAAAAAAAAAAAL, 0xAAAAAAAAAAAAAAAL }, 124) };

		final OfflineIterable iterable = new OfflineIterable<>(BitVectors.OFFLINE_SERIALIZER, LongArrayBitVector.getInstance());
		iterable.addAll(Arrays.asList(a));

		final Iterator iterator = iterable.iterator();
		for (final BitVector element : a) assertEquals(element, iterator.next());
		assertFalse(iterator.hasNext());
		iterable.close();
	}
}