code: /* LanguageTool, a natural language style checker 
   * Copyright (C) 2007 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.tagging.disambiguation;
  
  import org.jetbrains.annotations.Nullable;
  import org.languagetool.AnalyzedSentence;
  import org.languagetool.JLanguageTool;
  
  import java.io.IOException;
  
  /**
   * Disambiguator interface. Particular implementations are language-dependent.
   * 
   * <p>The POS tagger might assign multiple tags to the token.
   * The goal is to filter out the incorrect tags and leave ideally only one per token.
   */
  public interface Disambiguator {
    
    /**
     * If possible, filters out the wrong POS tags.
     * This code will run before disambiguation rules from xml are called.
     * This allows to have some initial disambiguation logic in Java.
     * 
     * @param input
     *          The sentence with already tagged words. The words are expected to
     *          have multiple tags.
     * @return Analyzed sentence, where each word has only one (possibly the most
     *         correct) tag.
     * @since 3.7
     */
    AnalyzedSentence preDisambiguate(AnalyzedSentence input);
  
    /**
     * If possible, filters out the wrong POS tags.
     * 
     * @param input
     *          The sentence with already tagged words. The words are expected to
     *          have multiple tags.
     * @return Analyzed sentence, where each word has only one (possibly the most
     *         correct) tag.
     */
    AnalyzedSentence disambiguate(AnalyzedSentence input) throws IOException;
  
    /**
     * The same as {@link #disambiguate(AnalyzedSentence)},
     * but may call {@code checkCanceled} (if it's non-null) to allow for better interruptibility.
     */
    default AnalyzedSentence disambiguate(
      AnalyzedSentence input, @Nullable JLanguageTool.CheckCancelledCallback checkCanceled
    ) throws IOException {
      return disambiguate(input);
    }
  }
  