final FileIndexer fileIndexer;
final FileIndexerWorker fileIndexerWorker;
try {
fileIndexer = new FileIndexer(openFileModel.getFile(), indexerClass);
fileIndexer.addObserver(this);
} catch (FileNotFoundException e) {
ExceptionHandler.handle(e, UIMessage.ERROR_FILE_NOT_FOUND, openFileModel.getFile().getName());
return;
}