void performUsing(final PrintFilesHandler handler, final _NativeEvent event) {
    // create file list from fileNames
    final List<String> fileNameList = event.get(0);
    final ArrayList<File> files = new ArrayList<File>(fileNameList.size());
    for (final String fileName : fileNameList) files.add(new File(fileName));

    handler.printFiles(new PrintFilesEvent(files));
}
 

@Override
public void printFiles(PrintFilesEvent event) {
    for (File file : event.getFiles()) {
        EventQueue.invokeLater(new DeferredPrint(file.toPath()));
    }
}