cvs2svn_lib/key_generator.py

   1 # (Be in -*- python -*- mode.)
   2 #
   3 # ====================================================================
   4 # Copyright (c) 2000-2008 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 class KeyGenerator:
  21   """Generate a series of unique keys."""
  22
  23   def __init__(self, first_id=1):
  24     """Initialize a KeyGenerator with the specified FIRST_ID.
  25
  26     FIRST_ID should be an int or long, and the generated keys will be
  27     of the same type."""
  28
  29     self._key_base = first_id
  30     self._last_id = None
  31
  32   def gen_id(self):
  33     """Generate and return a previously-unused key, as an integer."""
  34
  35     self._last_id = self._key_base
  36     self._key_base += 1
  37
  38     return self._last_id
  39
  40   def get_last_id(self):
  41     """Return the last id that was generated, as an integer."""
  42
  43     return self._last_id
  44
  45