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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.common;

import java.io.PrintWriter;
import java.util.List;

import edu.stanford.nlp.ling.HasWord;
import edu.stanford.nlp.util.concurrent.ThreadsafeProcessor;

/**
 * Takes a sentence and returns a ParserQuery with the given sentence parsed.  
 * Can be used in a MulticoreWrapper.
 *
 * @author John Bauer
 */
public class ParsingThreadsafeProcessor implements ThreadsafeProcessor, ParserQuery> {
  ParserGrammar pqFactory;
  PrintWriter pwErr;

  public ParsingThreadsafeProcessor(ParserGrammar pqFactory) {
    this(pqFactory, null);
  }

  public ParsingThreadsafeProcessor(ParserGrammar pqFactory, PrintWriter pwErr) {
    this.pqFactory = pqFactory;
    this.pwErr = pwErr;
  }

  @Override
  public ParserQuery process(List sentence) {
    ParserQuery pq = pqFactory.parserQuery();
    if (pwErr != null) {
      pq.parseAndReport(sentence, pwErr);
    } else {
      pq.parse(sentence);
    }
    return pq;
  }

  @Override
  public ThreadsafeProcessor, ParserQuery> newInstance() {
    // ParserQueryFactories should be threadsafe
    return this;
  }
}