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/*******************************************************************************
 * Copyright (c) 2010-2020 Haifeng Li. All rights reserved.
 *
 * Smile 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.
 *
 * 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 Lesser General Public License for more details.
 *
 * You should have received a copy of the GNU Lesser 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 BreakIterator boundary;

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

    /**
     * Constructor for the given 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());
        }

        String[] array = new String[sentences.size()];
        for (int i = 0; i < array.length; i++) {
            array[i] = sentences.get(i);
        }

        return array;
    }
}