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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.compression;

/*
 * DSI utilities
 *
 * Copyright (C) 2005-2020 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 .
 *
 */

import it.unimi.dsi.bits.BitVector;

/** A codec based on a set of prefix-free codewords.
 *
 * Prefix codec work by building a vector of prefix-free codewords, one for each symbol. The
 * method {@link #codeWords()} returns that vector. Moreover, this interface
 * strengthens the return type of {@link #coder()} to {@link PrefixCoder}.
 */
public interface PrefixCodec extends Codec {
	/** Returns the vector of prefix-free codewords used by this prefix coder.
	 *
	 * @return the vector of prefix-free codewords used by this prefix coder.
	 */
	public BitVector[] codeWords();

	@Override
	public PrefixCoder coder();
}