war/src/main/java/pnews/NER.java

   1 package pnews;
   2
   3 import java.io.IOException;
   4 import java.util.ArrayList;
   5 import java.util.List;
   6 import java.util.logging.Logger;
   7
   8 import edu.stanford.nlp.ie.crf.CRFClassifier;
   9 import edu.stanford.nlp.util.CoreMap;
  10 import edu.stanford.nlp.util.Triple;
  11
  12 /** https://stanfordnlp.github.io/CoreNLP/api.html */
  13 public class NER {
  14         private static final String CLASS_NAME = NER.class.getName();
  15         private static final Logger LOG = Logger.getLogger(CLASS_NAME);
  16         private static final CRFClassifier<CoreMap> classifier = CRFClassifier.getDefaultClassifier();
  17
  18         public static List<String> classify(String str, List<String> entities) throws ClassCastException, ClassNotFoundException, IOException {
  19
  20                 List<Triple<String, Integer, Integer>> triples;
  21                 String w;
  22                 final String FUNCTION_NAME = "classify";
  23
  24                 LOG.entering(CLASS_NAME, FUNCTION_NAME, str);
  25
  26                 OpenNLP.classify(str, entities);
  27
  28                 synchronized (classifier) {
  29                         triples = classifier.classifyToCharacterOffsets(str);
  30                 }
  31
  32                 for (Triple<String, Integer, Integer> t: triples) {
  33                         w = str.substring(t.second, t.third);
  34                         if (!entities.contains(w))
  35                                 entities.add(w);
  36                 }
  37
  38                 entities.remove("CNET");
  39                 entities.remove("Read More");
  40                 entities.remove("New");
  41                 entities.remove("App");
  42                 entities.remove("Digital Trends");
  43
  44                 LOG.exiting(CLASS_NAME, FUNCTION_NAME, entities);
  45
  46                 return entities;
  47         }
  48
  49         public static void main(String[] args) throws Exception {
  50                 List<String> lst;
  51
  52                 lst = classify("I live in Washington and New York in United States.", new ArrayList<>());
  53                 for (String str: lst)
  54                         System.out.println(str);
  55         }
  56 }