code: /* LanguageTool, a natural language style checker 
   * Copyright (C) 2015 Daniel Naber (http://www.danielnaber.de)
   * 
   * This library is free software; you can redistribute it and/or
   * modify it under the terms of the GNU Lesser General Public
   * License as published by the Free Software Foundation; either
   * version 2.1 of the License, or (at your option) any later version.
   *
   * This library is distributed in the hope that it will be useful,
   * but WITHOUT ANY WARRANTY; without even the implied warranty of
   * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
   * Lesser General Public License for more details.
   *
   * You should have received a copy of the GNU Lesser General Public
   * License along with this library; if not, write to the Free Software
   * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301
   * USA
   */
  package org.languagetool.tools;
  
  import org.apache.commons.cli.BasicParser;
  import org.apache.commons.cli.CommandLine;
  import org.apache.commons.cli.CommandLineParser;
  import org.apache.commons.cli.HelpFormatter;
  import org.apache.commons.cli.Option;
  import org.apache.commons.cli.Options;
  import org.apache.commons.cli.ParseException;
  import org.jetbrains.annotations.NotNull;
  
  class BuilderOptions {
    public static final String INFO_OPTION = "info";
    public static final String OUTPUT_OPTION = "o";
    public static final String INPUT_OPTION = "i";
    public static final String FREQ_OPTION = "freq";
    public static final String FREQ_HELP = "optional .xml file with a frequency wordlist, " 
        + "see https://dev.languagetool.org/developing-a-tagger-dictionary";
    public static final String INFO_HELP = "*.info properties file, " 
        + "see https://dev.languagetool.org/developing-a-tagger-dictionary";
    public static final String TAB_INPUT_HELP = "tab-separated plain-text dictionary file " 
        + "with format: wordform<tab>lemma<tab>postag";
  
    protected final Options options = new Options();
  
    BuilderOptions() {
      Option option = new Option(OUTPUT_OPTION, true, "output file");
      option.setRequired(true);
      options.addOption(option);
    }
    
    public void addOption(String opt, boolean hasArg, String description, boolean isRequired) {
      Option option = new Option(opt, hasArg, description);
      option.setRequired(isRequired);
      options.addOption(option);
    }
    
    @NotNull
    public CommandLine parseArguments(String[] args, Class<? extends DictionaryBuilder> clazz) throws ParseException {
      try {
        CommandLineParser parser = new BasicParser();
        CommandLine cmd = parser.parse(options, args);
        return cmd;
      } catch (ParseException e) {
        HelpFormatter formatter = new HelpFormatter();
        formatter.printHelp(clazz.getName(), options);
        System.exit(1);
        throw e; // should never happen - just to make compiler happy
      }
    }
  
  }
  