code: /* LanguageTool, a natural language style checker 
   * Copyright (C) 2005 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.patterns;
  
  import org.languagetool.JLanguageTool;
  import org.languagetool.Language;
  import org.languagetool.tools.Tools;
  import org.xml.sax.helpers.DefaultHandler;
  
  import javax.xml.parsers.SAXParser;
  import javax.xml.parsers.SAXParserFactory;
  import java.io.File;
  import java.io.FileInputStream;
  import java.io.IOException;
  import java.io.InputStream;
  import java.util.List;
  
  /**
   * Loads {@link PatternRule}s from an XML file.
   * 
   * @author Daniel Naber
   */
  public class PatternRuleLoader extends DefaultHandler {
  
    private boolean relaxedMode = false;
  
    /**
     * @param file XML file with pattern rules
     */
    public final List<AbstractPatternRule> getRules(File file, Language lang) throws IOException {
      try (InputStream inputStream = new FileInputStream(file)) {
        PatternRuleLoader ruleLoader = new PatternRuleLoader();
        return ruleLoader.getRules(inputStream, file.getAbsolutePath(), lang);
      }
    }
  
    /**
     * If set to true, don't throw an exception if id or name is not set.
     * Used for online rule editor.
     * @since 2.1
     */
    public void setRelaxedMode(boolean relaxedMode) {
      this.relaxedMode = relaxedMode;
    }
  
    /**
     * @param is stream with the XML rules
     * @param filename used only for verbose exception message - should refer to where the stream comes from
     */
    public final List<AbstractPatternRule> getRules(InputStream is, String filename, Language lang) throws IOException {
      try {
        PatternRuleHandler handler = new PatternRuleHandler(filename, lang);
        handler.setRelaxedMode(relaxedMode);
        SAXParserFactory factory = SAXParserFactory.newInstance();
        SAXParser saxParser = factory.newSAXParser();
        if (JLanguageTool.isCustomPasswordAuthenticatorUsed()) {
          Tools.setPasswordAuthenticator();
        }
        saxParser.getXMLReader().setFeature("http://apache.org/xml/features/nonvalidating/load-external-dtd", false);
        saxParser.parse(is, handler);
        return handler.getRules();
      } catch (Exception e) {
        throw new IOException("Cannot load or parse input stream of '" + filename + "'", e);
      }
    }
  
  }
  
  