class PdfFileSourceListAdapter {

    public List<PdfFileSource> getFileSourceList() {
        fileSourceList.addAll(parserFactory.createSource(file).getInputFiles(file));

        if (fileSourceList.isEmpty()) {
            throw new ConversionException("No input files specified in '" + file.getPath() + "'");
        }
        return fileSourceList;
    }

    public  PdfFileSourceListAdapter(String filePath);

}