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/*
 * SimMetrics - SimMetrics is a java library of Similarity or Distance Metrics,
 * e.g. Levenshtein Distance, that provide float based similarity measures
 * between String Data. All metrics return consistent measures rather than
 * unbounded similarity scores.
 * 
 * Copyright (C) 2014 SimMetrics authors
 * 
 * This file is part of SimMetrics. This program is free software: you can
 * redistribute it and/or modify it under the terms of the GNU General Public
 * License as published by the Free Software Foundation, either version 3 of the
 * License, or (at your option) any later version.
 * 
 * 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. See the GNU General Public License for more
 * details.
 * 
 * You should have received a copy of the GNU General Public License along with
 * SimMetrics. If not, see .
 */

package org.simmetrics.tokenizers;

import static java.util.Arrays.asList;
import static java.util.Collections.emptyList;

import java.util.List;
import java.util.regex.Pattern;

/**
 * Splits a string into tokens around white space.
 * 
 * This class is immutable and thread-safe.
 */
public final class Whitespace extends AbstractTokenizer {

	@Override
	public String toString() {
		return "WhitespaceTokenizer [" + pattern + "]";
	}

	private static final Pattern pattern = Pattern.compile("\\s+");

	@Override
	public List tokenizeToList(final String input) {
		if (input.isEmpty()) {
			return emptyList();
		}

		return asList(pattern.split(input));
	}

}