Analyze sentiment for Bitcoin Sentiment Analyzer on the SSaurel's Blog

AnalyzeSentiment.java

enum TypeSentiment {
 VERY_NEGATIVE(0), NEGATIVE(1), NEUTRAL(2), POSITIVE(3), VERY_POSITIVE(4);

 int index;

 private TypeSentiment(int index) {
  this.index = index;
 }

 public static TypeSentiment fromIndex(int index) {
  for (TypeSentiment typeSentiment: values()) {
   if (typeSentiment.index == index) {
    return typeSentiment;
   }
  }

  return TypeSentiment.NEUTRAL;
 }
}

public static TypeSentiment analyzeSentiment(String text) {
 Properties props = new Properties();
 props.setProperty("annotators", "tokenize, ssplit, parse, sentiment");
 StanfordCoreNLP pipeline = new StanfordCoreNLP(props);
 int mainSentiment = 0;

 if (text != null && text.length() > 0) {
  int longest = 0;
  Annotation annotation = pipeline.process(text);

  for (CoreMap sentence: annotation.get(CoreAnnotations.SentencesAnnotation.class)) {
   Tree tree = sentence.get(SentimentCoreAnnotations.SentimentAnnotatedTree.class);
   int sentiment = RNNCoreAnnotations.getPredictedClass(tree);
   String partText = sentence.toString();
   if (partText.length() > longest) {
    mainSentiment = sentiment;
    longest = partText.length();
   }

  }
 }

 return TypeSentiment.fromIndex(mainSentiment);
}