openNLP: Document Categorization

openNLP provides document categorizer tool to classify given text into pre-defined categories.

$ opennlp Doccat

Usage: opennlp Doccat model < documents

Document Categorizer API
Following is the working application to categorize given text.

import java.io.FileInputStream;
import java.io.InputStream;
import java.util.Objects;

import opennlp.tools.doccat.DoccatModel;
import opennlp.tools.doccat.DocumentCategorizerME;

public class CategoryDetectorUtil {
 private InputStream inputStream;
 private DoccatModel docCatModel;
 private DocumentCategorizerME myCategorizer;

 public CategoryDetectorUtil(String modelFile) {
  Objects.nonNull(modelFile);
  initModel(modelFile);
 }

 private void initModel(String modelFile) {
  try {
   inputStream = new FileInputStream(modelFile);
   docCatModel = new DoccatModel(inputStream);
   myCategorizer = new DocumentCategorizerME(docCatModel);
  } catch (Exception e) {
   System.out.println(e.getMessage());
  }

 }

 public String getCategory(String text) {
  double[] outcomes = myCategorizer.categorize(text);
  String category = myCategorizer.getBestCategory(outcomes);
  return category;
 }
}

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