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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.parser.lexparser;

/** Class for parse edges.
 *
 *  @author Dan Klein
 */
public class Edge extends Item {

  public Hook backHook;

  public Edge(boolean exhaustiveTest) {
  	super(exhaustiveTest);
  }
  
  public Edge(Edge e) {
  	super(e);
  	backHook = e.backHook;
  }
  
  @Override
  public boolean isEdge() {
    return true;
  }

  @Override
  public String toString() {
    // TODO: used to contain more useful information
    //return "Edge(" + Numberer.getGlobalNumberer("states").object(state) + ":" + start + "-" + end + "," + head + "/" + Numberer.getGlobalNumberer("tags").object(tag) + ")";
    return "Edge(" + state + ":" + start + "-" + end + "," + head + "/" + tag + ")";
  }

  @Override
  public int hashCode() {
    return (state << 1) ^ (head << 8) ^ (tag << 16) ^ (start << 4) ^ (end << 24);
  }

  @Override
  public boolean equals(Object o) {
    if (this == o) {
      return true;
    } else if (o instanceof Edge) {
      Edge e = (Edge) o;
      if (state == e.state && head == e.head && tag == e.tag && start == e.start && end == e.end) {
        return true;
      }
    }
    return false;
  }

}