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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.ling;

import java.io.Serializable;

/**
 * Represents a tag for a multi token expression
 * Can be used to annotate individual tokens without
 *   having nested annotations
 *
 * @author Angel Chang
 */
public class MultiTokenTag implements Serializable {
  private static final long serialVersionUID = 1;

  public Tag tag;
  public int index;

  public static class Tag implements  Serializable {
    private static final long serialVersionUID = 1;

    public String name;
    public String tag;

    public int length;  // total length of expression

    public Tag(String name, String tag, int length) {
      this.name = name;
      this.tag = tag;
      this.length = length;
    }

    @Override
    public boolean equals(Object o) {
      if (this == o) return true;
      if (o == null || getClass() != o.getClass()) return false;

      Tag tag1 = (Tag) o;

      if (length != tag1.length) return false;
      if (!name.equals(tag1.name)) return false;
      if (!tag.equals(tag1.tag)) return false;

      return true;
    }

    @Override
    public int hashCode() {
      int result = name.hashCode();
      result = 31 * result + tag.hashCode();
      result = 31 * result + length;
      return result;
    }
  }

  public MultiTokenTag(Tag tag, int index) {
    this.tag = tag;
    this.index = index;
  }

  public boolean isStart() {
    return index == 0;
  }

  public boolean isEnd() {
    return index == tag.length - 1;
  }

  public String toString() {
    return  tag.name + "/" + tag.tag +  "(" + index + "/" + tag.length + ")";
  }

  @Override
  public boolean equals(Object o) {
    if (this == o) return true;
    if (o == null || getClass() != o.getClass()) return false;

    MultiTokenTag that = (MultiTokenTag) o;

    if (index != that.index) return false;
    if (!tag.equals(that.tag)) return false;

    return true;
  }

  @Override
  public int hashCode() {
    int result = tag.hashCode();
    result = 31 * result + index;
    return result;
  }
}