cvs2svn_lib/key_generator.py

   1 # (Be in -*- python -*- mode.)
   2 #
   3 # ====================================================================
   4 # Copyright (c) 2000-2006 CollabNet.  All rights reserved.
   5 #
   6 # This software is licensed as described in the file COPYING, which
   7 # you should have received as part of this distribution.  The terms
   8 # are also available at http://subversion.tigris.org/license-1.html.
   9 # If newer versions of this license are posted there, you may use a
  10 # newer version instead, at your option.
  11 #
  12 # This software consists of voluntary contributions made by many
  13 # individuals.  For exact contribution history, see the revision
  14 # history and logs, available at http://cvs2svn.tigris.org/.
  15 # ====================================================================
  16
  17 """This module contains the KeyGenerator class."""
  18
  19
  20 import sys
  21 import os
  22 import marshal
  23
  24 from boolean import *
  25
  26
  27 class KeyGenerator:
  28   """Generate a series of unique keys."""
  29
  30   def __init__(self, key_base=1L):
  31     """Initialize a KeyGenerator with the specified KEY_BASE.
  32
  33     KEY_BASE should be an int or long, and the generated keys will be
  34     of the same type."""
  35
  36     self.key_base = key_base
  37
  38   def gen_id(self):
  39     """Generate and return a previously-unused key, as an integer."""
  40
  41     id = self.key_base
  42     self.key_base += 1
  43
  44     return id
  45
  46   def gen_key(self):
  47     """Generate and return a previously-unused key, as a string."""
  48
  49     return '%x' % self.gen_id()
  50
  51