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Stanford CoreNLP provides a set of natural language analysis tools which can take raw English language text input and give the base forms of words, their parts of speech, whether they are names of companies, people, etc., normalize dates, times, and numeric quantities, mark up the structure of sentences in terms of phrases and word dependencies, and indicate which noun phrases refer to the same entities. It provides the foundational building blocks for higher level text understanding applications.

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package edu.stanford.nlp.tagger.maxent;

import java.io.BufferedReader;
import java.io.FileInputStream;
import java.io.IOException;
import java.io.InputStreamReader;
import java.util.Map;
import java.util.Set;

import edu.stanford.nlp.util.Generics;

public class CtbDict {

  private static final String defaultFilename = "ctb_dict.txt";
  private static CtbDict ctbDictSingleton;


  private static synchronized CtbDict getInstance() {
    if (ctbDictSingleton == null) {
      ctbDictSingleton = new CtbDict();
    }
    return ctbDictSingleton;
  }


  private CtbDict() {
    try {
      readCtbDict("/u/nlp/data/pos-tagger/dictionary" + '/' + defaultFilename);
    } catch(IOException e) {
      throw new RuntimeException("can't open file: " + e.getMessage());
      /* java sucks */
    }
  }


  public Map > ctb_pre_dict;
  public Map > ctb_suf_dict;


  private void readCtbDict(String filename) throws IOException {
    BufferedReader ctbDetectorReader = new BufferedReader(new InputStreamReader(new FileInputStream(filename), "GB18030"));
    String ctbDetectorLine;

    ctb_pre_dict = Generics.newHashMap();
    ctb_suf_dict = Generics.newHashMap();

    while ((ctbDetectorLine = ctbDetectorReader.readLine()) != null) {
      String[] fields = ctbDetectorLine.split("	");
      String tag=fields[0];
      Set pres=ctb_pre_dict.get(tag);
      Set sufs=ctb_suf_dict.get(tag);

      if(pres==null){
        pres = Generics.newHashSet();
        ctb_pre_dict.put(tag,pres);
      }
      pres.add(fields[1]);

      if(sufs==null){
        sufs = Generics.newHashSet();
        ctb_suf_dict.put(tag,sufs);
      }
      sufs.add(fields[2]);


    }
  }//try


  protected static String getTagPre(String a1, String a2) {
    CtbDict dict = CtbDict.getInstance();
    if (dict.getpre(a1)== null)	return "0";
    if (dict.getpre(a1).contains(a2))
      return "1";
    return "0";
  }



  protected static String getTagSuf(String a1, String a2) {
    CtbDict dict = CtbDict.getInstance();
    if (dict.getsuf(a1)== null)	return "0";
    if (dict.getsuf(a1).contains(a2))
      return "1";
    return "0";
  }


  private Set getpre(String a){
    return ctb_pre_dict.get(a);
  }

  private Set getsuf(String a){
    return ctb_suf_dict.get(a);
  }

}//class