@Test
  public void roundtripWithContentSelectorsAndUmlauts() throws IOException, SaveException {
    String fileContent =
        "% Encoding: UTF-8"
            + OS.NEWLINE
            + OS.NEWLINE
            + "@Comment{jabref-meta: selector_journal:Test {\\\\\"U}mlaut;}"
            + OS.NEWLINE;
    Charset encoding = StandardCharsets.UTF_8;

    ParserResult firstParse =
        new BibtexParser(importFormatPreferences).parse(new StringReader(fileContent));

    SavePreferences preferences =
        new SavePreferences().withEncoding(encoding).withSaveInOriginalOrder(true);
    BibDatabaseContext context =
        new BibDatabaseContext(
            firstParse.getDatabase(),
            firstParse.getMetaData(),
            new Defaults(BibDatabaseMode.BIBTEX));

    StringSaveSession session =
        databaseWriter.savePartOfDatabase(
            context, firstParse.getDatabase().getEntries(), preferences);

    assertEquals(fileContent, session.getStringValue());
  }
  @Test
  public void roundtripWithUserCommentBeforeStringAndChange() throws Exception {
    Path testBibtexFile = Paths.get("src/test/resources/testbib/complex.bib");
    Charset encoding = StandardCharsets.UTF_8;
    ParserResult result =
        new BibtexParser(importFormatPreferences)
            .parse(Importer.getReader(testBibtexFile, encoding));

    for (BibtexString string : result.getDatabase().getStringValues()) {
      // Mark them as changed
      string.setContent(string.getContent());
    }

    SavePreferences preferences =
        new SavePreferences().withEncoding(encoding).withSaveInOriginalOrder(true);
    BibDatabaseContext context =
        new BibDatabaseContext(
            result.getDatabase(), result.getMetaData(), new Defaults(BibDatabaseMode.BIBTEX));

    StringSaveSession session =
        databaseWriter.savePartOfDatabase(context, result.getDatabase().getEntries(), preferences);

    try (Scanner scanner = new Scanner(testBibtexFile, encoding.name())) {
      assertEquals(scanner.useDelimiter("\\A").next(), session.getStringValue());
    }
  }
  @Test
  public void roundtripWithUserCommentAndEntryChange() throws Exception {
    Path testBibtexFile = Paths.get("src/test/resources/testbib/bibWithUserComments.bib");
    Charset encoding = StandardCharsets.UTF_8;
    ParserResult result =
        new BibtexParser(importFormatPreferences)
            .parse(Importer.getReader(testBibtexFile, encoding));

    BibEntry entry = result.getDatabase().getEntryByKey("1137631").get();
    entry.setField("author", "Mr. Author");

    SavePreferences preferences =
        new SavePreferences().withEncoding(encoding).withSaveInOriginalOrder(true);
    BibDatabaseContext context =
        new BibDatabaseContext(
            result.getDatabase(), result.getMetaData(), new Defaults(BibDatabaseMode.BIBTEX));

    StringSaveSession session =
        databaseWriter.savePartOfDatabase(context, result.getDatabase().getEntries(), preferences);

    try (Scanner scanner =
        new Scanner(
            Paths.get("src/test/resources/testbib/bibWithUserCommentAndEntryChange.bib"),
            encoding.name())) {
      assertEquals(scanner.useDelimiter("\\A").next(), session.getStringValue());
    }
  }
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  @Test
  public void duplicateBibDatabaseConfiguration() throws URISyntaxException, IOException {
    InputStream originalStream = AuxParserTest.class.getResourceAsStream("config.bib");
    File auxFile = Paths.get(AuxParserTest.class.getResource("paper.aux").toURI()).toFile();
    try (InputStreamReader originalReader =
        new InputStreamReader(originalStream, StandardCharsets.UTF_8)) {
      ParserResult result = new BibtexParser(importFormatPreferences).parse(originalReader);

      AuxParser auxParser = new AuxParser(auxFile.getAbsolutePath(), result.getDatabase());
      AuxParserResult auxResult = auxParser.parse();
      BibDatabase db = auxResult.getGeneratedBibDatabase();

      assertEquals(Optional.of("\"Maintained by \" # maintainer"), db.getPreamble());
      assertEquals(1, db.getStringCount());
    }
  }
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  private void doContentImport(String fileName, List<BibEntry> res) {

    PdfContentImporter contentImporter =
        new PdfContentImporter(Globals.prefs.getImportFormatPreferences());
    Path filePath = Paths.get(fileName);
    ParserResult result =
        contentImporter.importDatabase(filePath, Globals.prefs.getDefaultEncoding());
    if (result.hasWarnings()) {
      frame.showMessage(result.getErrorMessage());
    }

    if (!result.getDatabase().hasEntries()) {
      // import failed -> generate default entry
      createNewBlankEntry(fileName).ifPresent(res::add);
      return;
    }

    // only one entry is imported
    BibEntry entry = result.getDatabase().getEntries().get(0);

    // insert entry to database and link file
    panel.getDatabase().insertEntry(entry);
    panel.markBaseChanged();
    BibtexKeyPatternUtil.makeLabel(
        panel
            .getBibDatabaseContext()
            .getMetaData()
            .getCiteKeyPattern(Globals.prefs.getBibtexKeyPatternPreferences().getKeyPattern()),
        panel.getDatabase(),
        entry,
        Globals.prefs.getBibtexKeyPatternPreferences());
    DroppedFileHandler dfh = new DroppedFileHandler(frame, panel);
    dfh.linkPdfToEntry(fileName, entry);
    panel.highlightEntry(entry);
    if (Globals.prefs.getBoolean(JabRefPreferences.AUTO_OPEN_FORM)) {
      EntryEditor editor = panel.getEntryEditor(entry);
      panel.showEntryEditor(editor);
    }
    res.add(entry);
  }
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  private void doXMPImport(String fileName, List<BibEntry> res) {
    List<BibEntry> localRes = new ArrayList<>();
    PdfXmpImporter importer = new PdfXmpImporter(Globals.prefs.getXMPPreferences());
    Path filePath = Paths.get(fileName);
    ParserResult result = importer.importDatabase(filePath, Globals.prefs.getDefaultEncoding());
    if (result.hasWarnings()) {
      frame.showMessage(result.getErrorMessage());
    }
    localRes.addAll(result.getDatabase().getEntries());

    BibEntry entry;
    if (localRes.isEmpty()) {
      // import failed -> generate default entry
      LOGGER.info("Import failed");
      createNewBlankEntry(fileName).ifPresent(res::add);
      return;
    }

    // only one entry is imported
    entry = localRes.get(0);

    // insert entry to database and link file
    panel.getDatabase().insertEntry(entry);
    panel.markBaseChanged();
    FileListTableModel tm = new FileListTableModel();
    File toLink = new File(fileName);
    // Get a list of file directories:
    List<String> dirsS =
        panel.getBibDatabaseContext().getFileDirectory(Globals.prefs.getFileDirectoryPreferences());

    tm.addEntry(
        0,
        new FileListEntry(
            toLink.getName(),
            FileUtil.shortenFileName(toLink, dirsS).getPath(),
            ExternalFileTypes.getInstance().getExternalFileTypeByName("PDF")));
    entry.setField(FieldName.FILE, tm.getStringRepresentation());
    res.add(entry);
  }
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  @Override
  public ParserResult importDatabase(BufferedReader reader) throws IOException {
    Objects.requireNonNull(reader);

    List<BibEntry> bibItems = new ArrayList<>();

    try {
      JAXBContext context =
          JAXBContext.newInstance("net.sf.jabref.logic.importer.fileformat.medline");
      XMLInputFactory xmlInputFactory = XMLInputFactory.newFactory();
      XMLStreamReader xmlStreamReader = xmlInputFactory.createXMLStreamReader(reader);

      // go to the root element
      while (!xmlStreamReader.isStartElement()) {
        xmlStreamReader.next();
      }

      Unmarshaller unmarshaller = context.createUnmarshaller();
      Object unmarshalledObject = unmarshaller.unmarshal(xmlStreamReader);

      // check whether we have an article set, an article, a book article or a book article set
      if (unmarshalledObject instanceof PubmedArticleSet) {
        PubmedArticleSet articleSet = (PubmedArticleSet) unmarshalledObject;
        for (Object article : articleSet.getPubmedArticleOrPubmedBookArticle()) {
          if (article instanceof PubmedArticle) {
            PubmedArticle currentArticle = (PubmedArticle) article;
            parseArticle(currentArticle, bibItems);
          }
          if (article instanceof PubmedBookArticle) {
            PubmedBookArticle currentArticle = (PubmedBookArticle) article;
            parseBookArticle(currentArticle, bibItems);
          }
        }
      } else if (unmarshalledObject instanceof PubmedArticle) {
        PubmedArticle article = (PubmedArticle) unmarshalledObject;
        parseArticle(article, bibItems);
      } else if (unmarshalledObject instanceof PubmedBookArticle) {
        PubmedBookArticle currentArticle = (PubmedBookArticle) unmarshalledObject;
        parseBookArticle(currentArticle, bibItems);
      } else {
        PubmedBookArticleSet bookArticleSet = (PubmedBookArticleSet) unmarshalledObject;
        for (PubmedBookArticle bookArticle : bookArticleSet.getPubmedBookArticle()) {
          parseBookArticle(bookArticle, bibItems);
        }
      }
    } catch (JAXBException | XMLStreamException e) {
      LOGGER.debug("could not parse document", e);
      return ParserResult.fromErrorMessage(e.getLocalizedMessage());
    }
    return new ParserResult(bibItems);
  }
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  @Test
  public void testNormal() throws URISyntaxException, IOException {
    InputStream originalStream = AuxParserTest.class.getResourceAsStream("origin.bib");
    File auxFile = Paths.get(AuxParserTest.class.getResource("paper.aux").toURI()).toFile();
    try (InputStreamReader originalReader =
        new InputStreamReader(originalStream, StandardCharsets.UTF_8)) {
      ParserResult result = new BibtexParser(importFormatPreferences).parse(originalReader);

      AuxParser auxParser = new AuxParser(auxFile.getAbsolutePath(), result.getDatabase());
      AuxParserResult auxResult = auxParser.parse();

      assertTrue(auxResult.getGeneratedBibDatabase().hasEntries());
      assertEquals(0, auxResult.getUnresolvedKeysCount());
      BibDatabase newDB = auxResult.getGeneratedBibDatabase();
      assertEquals(2, newDB.getEntries().size());
      assertEquals(2, auxResult.getResolvedKeysCount());
      assertEquals(2, auxResult.getFoundKeysInAux());
      assertEquals(
          auxResult.getFoundKeysInAux() + auxResult.getCrossRefEntriesCount(),
          auxResult.getResolvedKeysCount() + auxResult.getUnresolvedKeysCount());
      assertEquals(0, auxResult.getCrossRefEntriesCount());
    }
  }