class FileCache {

	public synchronized void purge() {
		for (File f : cacheDir.listFiles()) {
			String name = f.getName();
			if (f.isDirectory() && NESTING_DIR_NAME_REGEX.matcher(name).matches()) {
				FileUtilities.deleteDir(f);
			}
		}
	}

	public  FileCache(File cacheDir);

}