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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.shiftreduce;

import java.util.List;
import edu.stanford.nlp.parser.common.ParserConstraint;

/**
 * Transition that literally does nothing
 */
public class IdleTransition implements Transition {
  /**
   * Legal only if the state is already finished
   */
  public boolean isLegal(State state, List constraints) {
    return state.finished;
  }

  /**
   * Do nothing
   */
  public State apply(State state) {
    return apply(state, 0.0);
  }

  /**
   * Do nothing
   */
  public State apply(State state, double scoreDelta) {
    return new State(state.stack, state.transitions.push(this), state.separators, state.sentence, state.tokenPosition, state.score + scoreDelta, state.finished);
  }

  @Override
  public boolean equals(Object o) {
    if (o == this) {
      return true;
    }
    if (o instanceof IdleTransition) {
      return true;
    }
    return false;
  }

  @Override
  public int hashCode() {
    return 586866881; // a random int
  }

  @Override
  public String toString() {
    return "Idle";
  }

  private static final long serialVersionUID = 1;  
}