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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.

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package it.unimi.dsi.bits;

/*
 * DSI utilities
 *
 * Copyright (C) 2007-2018 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 .
 *
 */

import it.unimi.dsi.fastutil.booleans.BooleanBigArrayBigList;
import it.unimi.dsi.fastutil.booleans.BooleanBigList;
import it.unimi.dsi.fastutil.booleans.BooleanBigLists;
import it.unimi.dsi.fastutil.booleans.BooleanList;

import java.io.Serializable;

/** A boolean-list based implementation of {@link BitVector}.
 *
 * This implementation of a bit vector is based on a backing
 * list of booleans. It is rather inefficient, but useful for
 * wrapping purposes, for covering completely the code in
 * {@link AbstractBitVector} and for creating mock objects.
 */
public class BooleanListBitVector extends AbstractBitVector implements Serializable {
	private static final long serialVersionUID = 1L;
	/** The backing list. */
	private final BooleanBigList list;

	protected static final void ensureIntegerIndex(final long index) {
		if (index > Integer.MAX_VALUE) throw new IllegalArgumentException("This BitVector implementation accepts integer indices only");
	}

	public static BooleanListBitVector getInstance(final long capacity) {
		if (capacity > Integer.MAX_VALUE) throw new IllegalArgumentException("This BitVector implementation accepts integer indices only");
		return new BooleanListBitVector((int)capacity);
	}

	/** Creates a new empty bit vector. */
	public static BooleanListBitVector getInstance() {
		return new BooleanListBitVector(0);
	}

	/** Creates a new bit vector with given bits. */
	public static BooleanListBitVector of(final int... bit) {
		final BooleanListBitVector bitVector = BooleanListBitVector.getInstance(bit.length);
		for(int b : bit) bitVector.add(b);
		return bitVector;
	}


	protected BooleanListBitVector(final BooleanBigList list) { this.list = list; }

	protected BooleanListBitVector(final int capacity) {
		this(new BooleanBigArrayBigList(capacity));
	}

	public static BooleanListBitVector wrap(final BooleanList list) {
		return new BooleanListBitVector(BooleanBigLists.asBigList(list));
	}

	public static BooleanListBitVector wrap(final BooleanBigList list) {
		return new BooleanListBitVector(list);
	}

	@Override
	public long length() {
		return list.size64();
	}

	@Override
	public boolean set(final long index, final boolean value) {
		ensureIntegerIndex(index);
		return list.set((int)index, value);
	}

	@Override
	public boolean getBoolean(final long index) {
		ensureIntegerIndex(index);
		return list.getBoolean((int)index);
	}

	@Override
	public void add(final long index, final boolean value) {
		ensureIntegerIndex(index);
		list.add((int)index, value);
	}

	@Override
	public boolean removeBoolean(final long index) {
		ensureIntegerIndex(index);
		return list.removeBoolean((int)index);
	}

	@Override
	public BooleanListBitVector copy(final long from, final long to) {
		BitVectors.ensureFromTo(length(), from, to);
		return new BooleanListBitVector(list.subList((int)from, (int)to));
	}

	@Override
	public BooleanListBitVector copy() {
		return new BooleanListBitVector(new BooleanBigArrayBigList(list));
	}

	public BitVector ensureCapacity(final long numBits) {
		if (numBits > Integer.MAX_VALUE) throw new IllegalArgumentException("This BitVector implementation accepts integer indices only");
		list.size((int)numBits);
		return this;
	}

	@Override
	public BitVector length(final long numBits) {
		if (numBits > Integer.MAX_VALUE) throw new IllegalArgumentException("This BitVector implementation accepts integer indices only");
		list.size((int)numBits);
		return this;
	}
}