PartOfSpeechTaggerFactory.java :  » Natural-Language-Processing » MorphAdorner » edu » northwestern » at » utils » corpuslinguistics » postagger » Java Open Source

package edu.northwestern.at.utils.corpuslinguistics.postagger;

/*  Please see the license information at the end of this file. */

import java.util.*;

import edu.northwestern.at.utils.*;
import edu.northwestern.at.utils.corpuslinguistics.postagger.affix.*;
import edu.northwestern.at.utils.corpuslinguistics.postagger.bigram.*;
import edu.northwestern.at.utils.corpuslinguistics.postagger.bigramhybrid.*;
import edu.northwestern.at.utils.corpuslinguistics.postagger.hepple.*;
import edu.northwestern.at.utils.corpuslinguistics.postagger.regexp.*;
import edu.northwestern.at.utils.corpuslinguistics.postagger.simple.*;
import edu.northwestern.at.utils.corpuslinguistics.postagger.suffix.*;
import edu.northwestern.at.utils.corpuslinguistics.postagger.trigram.*;
import edu.northwestern.at.utils.corpuslinguistics.postagger.trigramhybrid.*;
import edu.northwestern.at.utils.corpuslinguistics.postagger.unigram.*;

/**  PartOfSpeechTagger factory.
 */

public class PartOfSpeechTaggerFactory
{
  /**  Map from short to full class names for built-in taggers. */

  protected static Map<String, String> taggerClassMap  =
    MapFactory.createNewMap();

  /**  Get a partOfSpeechTagger.
   *
   *  @return    The partOfSpeechTagger.
   */

  public PartOfSpeechTagger newPartOfSpeechTagger()
  {
    String className  =
      System.getProperty( "partofspeechtagger.class" );

    if ( className == null )
    {
      className  =
        ClassUtils.packageName(
          getClass().getName() ) + ".trigramtagger.TrigramTagger";
    }

    return this.newPartOfSpeechTagger( className );
  }

  /**  Get a partOfSpeechTagger of a specified class name.
   *
   *  @param  className  Class name for the partOfSpeechTagger.
   *
   *  @return        The partOfSpeechTagger.
   */

  public PartOfSpeechTagger newPartOfSpeechTagger( String className )
  {
    PartOfSpeechTagger partOfSpeechTagger  = null;

    try
    {
      partOfSpeechTagger  =
        (PartOfSpeechTagger)Class.forName(
          className ).newInstance();
    }
    catch ( Exception e )
    {
      String fixedClassName  =
        (String)taggerClassMap.get( className );

      if ( fixedClassName != null )
      {
        try
        {
          partOfSpeechTagger  =
            (PartOfSpeechTagger)Class.forName(
              fixedClassName ).newInstance();
        }
        catch ( Exception e2 )
        {
          System.err.println(
            "Unable to create part of speech tagger of class " +
            fixedClassName + ", using trigram tagger." );

          partOfSpeechTagger  = new TrigramTagger();
        }
      }
      else
      {
        System.err.println(
          "Unable to create part of speech tagger of class " +
          className + ", using trigram tagger." );

        partOfSpeechTagger  = new TrigramTagger();
      }
    }

    return partOfSpeechTagger;
  }

  /**  Create short tagger class name -> full class names.
   */

  static
  {
    String classPrefix  =
      ClassUtils.packageName(
        PartOfSpeechTaggerFactory.class.getName() );

    taggerClassMap.put
    (
      "AffixTagger" ,
      classPrefix + ".affix.AffixTagger"
    );

    taggerClassMap.put
    (
      "BigramTagger" ,
      classPrefix + ".bigram.BigramTagger"
    );

    taggerClassMap.put
    (
      "BigramHybridTagger" ,
      classPrefix + ".bigramhybrid.BigramHybridTagger"
    );

    taggerClassMap.put
    (
      "HeppleTagger" ,
      classPrefix + ".hepple.HeppleTagger"
    );

    taggerClassMap.put
    (
      "RegexpTagger" ,
      classPrefix + ".regexp.RegexpTagger"
    );

    taggerClassMap.put
    (
      "SimpleTagger" ,
      classPrefix + ".simple.SimpleTagger"
    );

    taggerClassMap.put
    (
      "SimpleRuleBasedTagger" ,
      classPrefix + ".simplerulebased.SimpleRuleBasedTagger"
    );

    taggerClassMap.put
    (
      "SuffixTagger" ,
      classPrefix + ".suffix.SuffixTagger"
    );

    taggerClassMap.put
    (
      "TrigramTagger" ,
      classPrefix + ".trigram.TrigramTagger"
    );

    taggerClassMap.put
    (
      "TrigramHybridTagger" ,
      classPrefix + ".trigramhybrid.TrigramHybridTagger"
    );

    taggerClassMap.put
    (
      "UnigramTagger" ,
      classPrefix + ".unigram.UnigramTagger"
    );
  }
}

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   Northwestern University
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obtaining a copy of this software and associated documentation
files (the "Software"), to deal with the Software without
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sell copies of the Software, and to permit persons to whom the
Software is furnished to do so, subject to the following
conditions:

    * Redistributions of source code must retain the above copyright
      notice, this list of conditions and the following disclaimers.

    * Redistributions in binary form must reproduce the above
      copyright notice, this list of conditions and the following
      disclaimers in the documentation and/or other materials provided
      with the distribution.

    * Neither the names of Academic and Research Technologies,
      Northwestern University, nor the names of its contributors may be
      used to endorse or promote products derived from this Software
      without specific prior written permission.

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