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.rules;
  
  import org.languagetool.JLanguageTool;
  
  import java.io.InputStream;
  import java.util.*;
  
  /**
   * Load replacement data from a UTF-8 file. One replacement per line,
   * word and its replacement(s) separated by an equals sign. Both the
   * word and the replacements can have more than one form if separated
   * by pipe symbols.
   * @since 3.0
   */
  public final class SimpleReplaceDataLoader {
  
    /**
     * Load replacement rules from a utf-8 file in the classpath.
     */
    public Map<String, List<String>> loadWords(String path) {
      InputStream stream = JLanguageTool.getDataBroker().getFromRulesDirAsStream(path);
      Map<String, List<String>> map = new HashMap<>();
      try (Scanner scanner = new Scanner(stream, "utf-8")) {
        while (scanner.hasNextLine()) {
          String line = scanner.nextLine();
          if (line.isEmpty() || line.charAt(0) == '#') { // # = comment
            continue;
          }
          String[] parts = line.split("=");
          if (parts.length != 2) {
            throw new RuntimeException("Could not load simple replacement data from: " + path + ". " +
                    "Error in line '" + line + "', expected format 'word=replacement'");
          }
          if (parts[1].trim().isEmpty()) {
            throw new RuntimeException("Could not load simple replacement data from: " + path + ". " +
              "Error in line '" + line + "', replacement cannot be empty");
          }
          String[] wrongForms = parts[0].split("\\|");
          List<String> replacements = Arrays.asList(parts[1].split("\\|"));
          for (String wrongForm : wrongForms) {
            map.put(wrongForm, replacements);
          }
        }
      }
      return Collections.unmodifiableMap(map);
    }
  
  }
  