code: /* LanguageTool, a natural language style checker 
   * Copyright (C) 2005 Daniel Naber (http://www.danielnaber.de)
   * 
   * 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 2.1 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 library; if not, write to the Free Software
   * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301
   * USA
   */
  package org.languagetool.tokenizers.zh;
  
  import java.util.ArrayList;
  import java.util.List;
  
  import com.hankcs.hanlp.utility.SentencesUtil;
  import org.languagetool.tokenizers.SentenceTokenizer;
  
  public class ChineseSentenceTokenizer implements SentenceTokenizer {
  
    @Override
    public List<String> tokenize(String text) {
      List<String> result = new ArrayList<>();
      StringBuilder whitespace = new StringBuilder();
      StringBuilder nonWhitespace = new StringBuilder();
      // SentencesUtil.toSentenceList() ignores whitespace, so we add it ourselves so match positions are not messed up:
      for (int i = 0; i < text.length(); i++) {
        if (Character.isWhitespace(text.charAt(i))) {
          if (nonWhitespace.length() > 0) {
            result.addAll(SentencesUtil.toSentenceList(nonWhitespace.toString()));
            nonWhitespace.setLength(0);
          }
          whitespace.append(text.charAt(i));  // keep collecting whitespaces
        } else {
          if (whitespace.length() > 0) {
            result.add(whitespace.toString());
            whitespace.setLength(0);
          }
          nonWhitespace.append(text.charAt(i));
        }
      }
      if (whitespace.length() > 0) {
        result.add(whitespace.toString());
      }
      if (nonWhitespace.length() > 0) {
        result.addAll(SentencesUtil.toSentenceList(nonWhitespace.toString()));
      }
      return result;
    }
  
    /** Note: does have no effect for Chinese */
    @Override
    public void setSingleLineBreaksMarksParagraph(boolean lineBreakParagraphs) {
    }
  
    /** Note: will always return {@code false} */
    @Override
    public boolean singleLineBreaksMarksPara() {
      return false;
    }
  }
  