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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.ie.crf;

import edu.stanford.nlp.util.Index;

import java.io.Serializable;
import java.util.ArrayList;
import java.util.List;


/**
 * @author Jenny Finkel
 */

public class CRFLabel implements Serializable {

  private static final long serialVersionUID = 7403010868396790276L;

  private final int[] label;
  private int hashCode = -1;

  // todo: When rebuilding, change this to a better hash function like 31
  private static final int maxNumClasses = 10;

  public CRFLabel(int[] label) {
    this.label = label;
  }

  @Override
  public boolean equals(Object o) {
    if (!(o instanceof CRFLabel)) {
      return false;
    }
    CRFLabel other = (CRFLabel) o;

    if (other.label.length != label.length) {
      return false;
    }
    for (int i = 0; i < label.length; i++) {
      if (label[i] != other.label[i]) {
        return false;
      }
    }

    return true;
  }

  public CRFLabel getSmallerLabel(int size) {
    int[] newLabel = new int[size];
    System.arraycopy(label, label.length - size, newLabel, 0, size);
    return new CRFLabel(newLabel);
  }

  public CRFLabel getOneSmallerLabel() {
    return getSmallerLabel(label.length - 1);
  }

  public int[] getLabel() {
    return label;
  }

  public  String toString(Index classIndex) {
    List l = new ArrayList<>();
    for (int aLabel : label) {
      l.add(classIndex.get(aLabel));
    }
    return l.toString();
  }

  @Override
  public String toString() {
    List l = new ArrayList<>();
    for (int aLabel : label) {
      l.add(Integer.valueOf(aLabel));
    }
    return l.toString();
  }

  @Override
  public int hashCode() {
    if (hashCode < 0) {
      hashCode = 0;
      for (int aLabel : label) {
        hashCode *= maxNumClasses;
        hashCode += aLabel;
      }
    }
    return hashCode;
  }

}