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.ling.CoreLabel;
  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
  17         public static List<String> classify(String str, List<String> entities) throws ClassCastException, ClassNotFoundException, IOException {
  18                 final CRFClassifier<CoreLabel> classifier = CRFClassifier.getDefaultClassifier();
  19                 List<Triple<String, Integer, Integer>> triples;
  20                 String w;
  21                 final String FUNCTION_NAME = "classify";
  22
  23                 LOG.entering(CLASS_NAME, FUNCTION_NAME, str);
  24
  25                 OpenNLP.classify(str, entities);
  26
  27                 synchronized (classifier) {
  28                         triples = classifier.classifyToCharacterOffsets(str);
  29                         for (Triple<String, Integer, Integer> t: triples) {
  30                                 w = str.substring(t.second, t.third);
  31                                 if (!entities.contains(w))
  32                                         entities.add(w);
  33                         }
  34                 }
  35
  36                 entities.remove("CNET");
  37                 entities.remove("Read More");
  38                 entities.remove("New");
  39                 entities.remove("App");
  40
  41                 LOG.exiting(CLASS_NAME, FUNCTION_NAME, entities);
  42
  43                 return entities;
  44         }
  45
  46         public static void main(String[] args) throws Exception {
  47                 List<String> lst;
  48
  49                 lst = classify("I live in Washington and New York in United States.", new ArrayList<>());
  50                 for (String str: lst)
  51                         System.out.println(str);
  52         }
  53 }