blueflood-cloudfiles/src/main/java/com/rackspacecloud/blueflood/outputs/cloudfiles/RollupFile.java
private static long parseTimestamp(String fileName) throws NumberFormatException {
        String numberPart = fileName.substring(0, fileName.length() - 5);
        return Long.parseLong(numberPart);
    }
private static long parseTimestamp(String fileName) throws NumberFormatException {
        String numberPart = fileName.substring(0, fileName.length() - 5);
        return Long.parseLong(numberPart);
    }
Parse the timestamp from a filename.

@param fileName The file name to parse.
@return The timestamp contained in the file name.
@throws NumberFormatException