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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.trees;

import edu.stanford.nlp.ling.Label;
import edu.stanford.nlp.ling.LabelFactory;
import edu.stanford.nlp.ling.CoreLabel;

import java.util.List;


/**
 * A {@code TreeGraphNodeFactory} acts as a factory for creating
 * tree nodes of type {@link TreeGraphNode}.  Unless
 * another {@link LabelFactory} is supplied, it will use a CoreLabelFactory
 * by default.
 *
 * @author Bill MacCartney
 */
public class TreeGraphNodeFactory implements TreeFactory {

  private final LabelFactory mlf;

  /**
   * Make a {@code TreeFactory} that produces
   * {@code TreeGraphNode}s.  The labels are of class
   * {@code CoreLabel}.
   */
  public TreeGraphNodeFactory() {
    this(CoreLabel.factory());
  }

  /**
   * Make a {@code TreeFactory} that produces
   * {@code TreeGraphNode}s.  The labels depend on the
   * {@code LabelFactory}.
   *
   * @param mlf The LabelFactory to use for node labels
   */
  public TreeGraphNodeFactory(LabelFactory mlf) {
    this.mlf = mlf;
  }

  /** {@inheritDoc} */
  @Override
  public Tree newLeaf(final String word) {
    return newLeaf(mlf.newLabel(word));
  }

  /** {@inheritDoc} */
  @Override
  public Tree newLeaf(Label label) {
    return new TreeGraphNode(label);
  }

  /** {@inheritDoc} */
  @Override
  public Tree newTreeNode(final String parent, final List children) {
    return newTreeNode(mlf.newLabel(parent), children);
  }

  /** {@inheritDoc} */
  @Override
  public Tree newTreeNode(Label parentLabel, List children) {
    return new TreeGraphNode(parentLabel, children);
  }

}