+Mode = ["full", "incr", "diff"]
+
+Epoch = { "hour" : datetime.timedelta(0, 3600), \
+ "day" : datetime.timedelta(1), \
+ "week" : datetime.timedelta(7), \
+ "month" : datetime.timedelta(30), \
+ "year" : datetime.timedelta(365) }
+
+class Backup:
+ """A single backup has a date, an epoch and a mode."""
+
+ def __init__(self, date, epoch, mode):
+ self.date = date
+ self.epoch = epoch
+ self.mode = mode
+
+ def __str__(self):
+ return "[date: " + self.date.ctime() + \
+ ", epoch: " + self.epoch + \
+ ", mode: " + self.mode + "]"
+
+ @staticmethod
+ def getDirName(date, epoch, mode):
+ """Get directory name of backup by given properties."""
+ return date.strftime("%Y%m%d-%H%M") + "-" + epoch + "-" + mode
+
+ @staticmethod
+ def isBackupDir(dirname):
+ """Is directory a backup directory?"""
+ p = re.compile(r'^\d\d\d\d\d\d\d\d-\d\d\d\d-\w+-\w+$')
+ return p.match(dirname)
+
+
+
+