* @throws IOException
*/
public void start() throws IOException {
init();
List<PdfFileRule> rules = new SerializedFileRules().getRules();
PdfFolderParser pdfFolderParser = new PdfFolderParser(index);
for (PdfFileRule pdfFileRule : rules) {
File f;
while( (f = pdfFolderParser.parseFile(pdfFileRule)) != null) {