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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.util;

/**
 * Simple utility class: reads the environment variable in
 * ENV_VARIABLE and provides a method that converts strings which
 * start with that environment variable to file paths.  For example,
 * you can send it
 * "$NLP_DATA_HOME/data/pos-tagger/wsj3t0-18-left3words"
 * and it will convert that to
 * "/u/nlp/data/pos-tagger/wsj3t0-18-left3words"
 * unless you have set $NLP_DATA_HOME to something else.
 * 

 * The only environment variable expanded is that defined by
 * ENV_VARIABLE, and the only place in the string it is expanded is at
 * the start of the string.
 *
 * @author John Bauer
 */
public class DataFilePaths {

  private DataFilePaths() {}

  private static final String NLP_DATA_VARIABLE = "NLP_DATA_HOME";
  private static final String NLP_DATA_VARIABLE_PREFIX = '$' + NLP_DATA_VARIABLE;

  private static final String NLP_DATA_HOME =
    ((System.getenv(NLP_DATA_VARIABLE) != null) ?
     System.getenv(NLP_DATA_VARIABLE) : "/u/nlp");

  private static final String JAVANLP_VARIABLE = "JAVANLP_HOME";
  private static final String JAVANLP_VARIABLE_PREFIX = '$' + JAVANLP_VARIABLE;

  private static final String JAVANLP_HOME =
    ((System.getenv(JAVANLP_VARIABLE) != null) ?
     System.getenv(JAVANLP_VARIABLE) : ".");

  public static String convert(String path) {
    if (path.startsWith(NLP_DATA_VARIABLE_PREFIX))
      return NLP_DATA_HOME + path.substring(NLP_DATA_VARIABLE_PREFIX.length());
    if (path.startsWith(JAVANLP_VARIABLE_PREFIX))
      return JAVANLP_HOME + path.substring(JAVANLP_VARIABLE_PREFIX.length());
    return path;
  }

}