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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.ie.qe;

import edu.stanford.nlp.io.IOUtils;
import edu.stanford.nlp.ling.tokensregex.Env;

import java.io.BufferedReader;
import java.io.IOException;
import java.util.ArrayList;
import java.util.HashMap;
import java.util.List;
import java.util.Map;
import java.util.regex.Pattern;

/**
 * Potential prefix that goes in front of a quantifiable unit
 *
 * @author Angel Chang
 */
public class UnitPrefix {
  public String name;
  public String symbol;
  // What does this prefix do to the unit?
  public Double scale;
  public String system;

  public UnitPrefix(String name, String symbol, Double scale, String system) {
    this.name = name;
    this.symbol = symbol;
    this.scale = scale;
    this.system = system;
  }

  private Unit convert(Unit u) {
    return new Unit(
            name + u.getName(), symbol + u.getSymbol(),
            u.getType(), u, scale
         );
  }

  public String getName() {
    return name;
  }

  public void setName(String name) {
    this.name = name;
  }

  public String getSymbol() {
    return symbol;
  }

  public void setSymbol(String symbol) {
    this.symbol = symbol;
  }

  public Double getScale() {
    return scale;
  }

  public void setScale(Double scale) {
    this.scale = scale;
  }

  public void setScale(Number scale) {
    this.scale = scale.doubleValue();
  }

  public static void registerPrefixes(Env env, String filename) throws IOException {
    List prefixes = loadPrefixes(filename);
    registerPrefixes(env, prefixes);
  }

  public static void registerPrefixes(Env env, List prefixes) {
    for (UnitPrefix prefix: prefixes) {
      registerPrefix(env, prefix);
    }
  }

  public static void registerPrefix(Env env, UnitPrefix prefix) {
    env.bind(prefix.getName().toUpperCase(), prefix);
  }

  public static List loadPrefixes(String filename) throws IOException {
    Pattern commaPattern = Pattern.compile("\\s*,\\s*");
    BufferedReader br = IOUtils.getBufferedFileReader(filename);
    String headerString = br.readLine();
    String[] header = commaPattern.split(headerString);
    Map headerIndex = new HashMap<>();
    for (int i = 0; i < header.length; i++) {
      headerIndex.put(header[i], i);
    }
    int iName = headerIndex.get("name");
    int iPrefix = headerIndex.get("prefix");
    int iBase = headerIndex.get("base");
    int iExp = headerIndex.get("exp");
    int iSystem = headerIndex.get("system");
    String line;
    List list = new ArrayList<>();
    while ((line = br.readLine()) != null) {
      String[] fields = commaPattern.split(line);
      double base = Double.parseDouble(fields[iBase]);
      double exp = Double.parseDouble(fields[iExp]);
      double scale = Math.pow(base, exp);
      UnitPrefix unitPrefix = new UnitPrefix(fields[iName], fields[iPrefix], scale, fields[iSystem]);
      list.add(unitPrefix);
    }
    br.close();
    return list;
  }
}