base = base + "/";
}
for (Text file : values) {
String fileString = cleanS3(file.toString().trim());
if (base == null) {
helper.copyToTemp(fileString, snappy);
} else {
String prefix = fileString.substring(base.length());
prefix = prefix.replaceAll("/[^/]+$", "");
helper.copyToTemp(fileString, prefix, snappy);
}