public RandomCSVReader(String filename, String encoding,
                       String delim, boolean randomOrder,
                       boolean hasVariableNames, boolean firstLineIsHeader,
                       boolean isRewindOnEndOfList) {
    File f = new File(filename);
    this.file = (f.isAbsolute() || f.exists()) ? f : new File(FileServer.getFileServer().getBaseDir(), filename);
    this.encoding = encoding;
    this.delim = checkDelimiter(delim).charAt(0);
    this.isSkipFirstLine = !(!firstLineIsHeader && hasVariableNames);
    this.randomOrder = randomOrder;
    this.isRewindOnEndOfList = isRewindOnEndOfList;
    try {
        initOffsets();
        if (randomOrder) {
            initRandom();
        } else {
            initConsistentReader();
        }
        initHeader();
    } catch (IOException ex) {
        LOGGER.error("Cannot initialize RandomCSVReader, because of error: ", ex);
        throw new RuntimeException("Cannot initialize RandomCSVReader, because of error: " + ex.getMessage(), ex);
    }
}
 

private static PrintWriter getFileWriter(String filename,
        SampleSaveConfiguration saveConfig) throws IOException {
    if (filename == null || filename.length() == 0) {
        return null;
    }
    filename = FileServer.resolveBaseRelativeName(filename);
    FileEntry fe = files.get(filename);
    PrintWriter writer;

    if (fe == null) {
        // Find the name of the directory containing the file
        // and create it - if there is one
        File pdir = new File(filename).getParentFile();
        if (pdir != null) {
            // returns false if directory already exists, so need to check
            // again
            if (pdir.mkdirs()) {
                log.info("Folder " + pdir.getAbsolutePath()
                        + " was created");
            }
            // else if might have been created by another process so not a
            // problem
            if (!pdir.exists()) {
                log.warn("Error creating directories for "
                        + pdir.toString());
            }
        }
        writer = new PrintWriter(new OutputStreamWriter(
                new BufferedOutputStream(new FileOutputStream(filename)),
                SaveService.getFileEncoding("UTF-8")), SAVING_AUTOFLUSH); 
        log.debug("Opened file: " + filename);
        files.put(filename, new FileEntry(writer, saveConfig));
    } else {
        writer = fe.pw;
    }
    writeFileStart(writer, saveConfig);
    return writer;
}