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/*
 * Copyright (c) 2010-2025 Haifeng Li. All rights reserved.
 *
 * Smile 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.
 *
 * Smile 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 Smile. If not, see .
 */
package smile.nlp.tokenizer;

import java.text.BreakIterator;
import java.util.ArrayList;
import java.util.Locale;

/**
 * A sentence splitter based on the java.text.BreakIterator, which supports
 * multiple natural languages (selected by locale setting).
 * 
 * @author Haifeng Li
 */
public class BreakIteratorSentenceSplitter implements SentenceSplitter {

    /**
     * The working horse for splitting sentences.
     */
    private final BreakIterator boundary;

    /**
     * Constructor for the default locale.
     */
    public BreakIteratorSentenceSplitter() {
        boundary = BreakIterator.getSentenceInstance();
    }

    /**
     * Constructor for the given locale.
     * @param locale the locale.
     */
    public BreakIteratorSentenceSplitter(Locale locale) {
        boundary = BreakIterator.getSentenceInstance(locale);
    }

    @Override
    public String[] split(String text) {
        boundary.setText(text);
        ArrayList sentences = new ArrayList<>();
        int start = boundary.first();
        for (int end = boundary.next();
                end != BreakIterator.DONE;
                start = end, end = boundary.next()) {
            sentences.add(text.substring(start, end).trim());
        }

        return sentences.toArray(new String[0]);
    }
}