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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;

/**
 * If you have a TreeTransformer which is not threadsafe, and you need
 * to call it from multiple threads, this will wrap it in a
 * synchronized manner.
 *
 * @author John Bauer
 */
public class SynchronizedTreeTransformer implements TreeTransformer {
  final TreeTransformer threadUnsafe;

  public SynchronizedTreeTransformer(TreeTransformer threadUnsafe) {
    this.threadUnsafe = threadUnsafe;
  }

  public Tree transformTree(Tree t) {
    synchronized(threadUnsafe) {
      return threadUnsafe.transformTree(t);
    }
  }
}