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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.pipeline;

import edu.stanford.nlp.util.Pair;

import java.io.*;
import java.util.zip.GZIPInputStream;
import java.util.zip.GZIPOutputStream;

/**
 * Serializes Annotation objects using the default Java serializer
 */
public class GenericAnnotationSerializer extends AnnotationSerializer {

  boolean compress = false;

  public GenericAnnotationSerializer(boolean compress) {
    this.compress = compress;
  }

  public GenericAnnotationSerializer() {
    this(false);
  }

  /** Turns out, an ObjectOutputStream cannot append to a file. This is dumb. */
  public static class AppendingObjectOutputStream extends ObjectOutputStream {
    public AppendingObjectOutputStream(OutputStream out) throws IOException {
      super(out);
    }
    @Override
    protected void writeStreamHeader() throws IOException {
      // do not write a header, but reset
      reset();
    }
  }

  @Override
  public OutputStream write(Annotation corpus, OutputStream os) throws IOException {
    if (os instanceof AppendingObjectOutputStream) {
      ((AppendingObjectOutputStream) os).writeObject(corpus);
      return os;
    } else if (os instanceof ObjectOutputStream) {
      ObjectOutputStream objectOutput = new AppendingObjectOutputStream(compress ? new GZIPOutputStream(os) : os);
      objectOutput.writeObject(corpus);
      return objectOutput;
    } else {
      ObjectOutputStream objectOutput = new ObjectOutputStream(compress ? new GZIPOutputStream(os) : os);
      objectOutput.writeObject(corpus);
      return objectOutput;
    }
  }

  @Override
  public Pair read(InputStream is) throws IOException, ClassNotFoundException, ClassCastException {
    ObjectInputStream objectInput;
    if (is instanceof ObjectInputStream) {
      objectInput = (ObjectInputStream) is;
    } else {
      objectInput = new ObjectInputStream(compress ? new GZIPInputStream(is) : is);
    }
    Object annotation = objectInput.readObject();
    if(annotation == null) return null;
    if(! (annotation instanceof Annotation)){
      throw new ClassCastException("ERROR: Serialized data does not contain an Annotation!");
    }
    return Pair.makePair((Annotation) annotation, (InputStream) objectInput);
  }

}