code: /* LanguageTool, a natural language style checker
   * Copyright (C) 2019 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.rules.Rule;
  import org.xml.sax.Attributes;
  import org.xml.sax.helpers.DefaultHandler;
  
  import javax.xml.parsers.SAXParser;
  import javax.xml.parsers.SAXParserFactory;
  import java.io.InputStream;
  import java.util.*;
  
  public class RuleIdValidator {
  
    private final Language lang;
  
    public RuleIdValidator(Language lang) {
      this.lang = lang;
    }
    
    public void validateUniqueness() {
      System.out.println("Check rule id uniqueness for " + lang + "...");
      List<String> fileNames = lang.getRuleFileNames();
      Map<String, String> idsToFile = new HashMap<>();
      List<Rule> allRules = new JLanguageTool(lang).getAllRules();
      System.out.println("Loaded " + allRules.size() + " rules...");
      for (Rule rule : allRules) {
        if (!(rule instanceof AbstractPatternRule || rule instanceof RepeatedPatternRuleTransformer.RepeatedPatternRule)) {
          idsToFile.put(rule.getId(), "Java (" + rule.getClass().getName() + ")");
        }
      }
      for (String fileName : fileNames) {
        try (InputStream is = JLanguageTool.getDataBroker().getAsStream(fileName)) {
          if (is == null) {
            System.out.println("Skipping " + fileName + " - not found");  // e.g. nl/grammar-test-1.xml
            continue;
          }
          XmlIdHandler handler = new XmlIdHandler();
          SAXParserFactory factory = SAXParserFactory.newInstance();
          SAXParser saxParser = factory.newSAXParser();
          saxParser.parse(is, handler);
          for (String id : handler.ids) {
            if (idsToFile.containsKey(id)) {
              throw new RuntimeException("id '" + id + "' found at least twice. Found in " + fileName + " and " + idsToFile.get(id));
            }
            idsToFile.put(id, fileName);
          }
        } catch (Exception e) {
          throw new RuntimeException(e);
        }
      }
      //System.out.println("id uniqueness for " + lang + " finished");
    }
    
    private static class XmlIdHandler extends DefaultHandler {
  
      private final Set<String> ids = new HashSet<>();
  
      private String idPrefix = "";
  
      @Override
      public void startElement(String namespaceURI, String lName, String qName, Attributes attrs) {
        if (qName.equals("rules") && attrs.getValue("idprefix") != null) {
          idPrefix = attrs.getValue("idprefix");
        }
        if (qName.equals("rule") || qName.equals("rulegroup")) {
          String id = attrs.getValue("id");
          if (id != null) {
            ids.add(idPrefix + id);
          }
        }
      }
  
      @Override
      public void endElement(String namespaceURI, String lName, String qName) {
        if (qName.equals("rules")) {
          idPrefix = "";
        }
      }
  
    }
    
  }
  