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# Copyright (c) 2000-2008 CollabNet.  All rights reserved.
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"""This module contains the KeyGenerator class."""


class KeyGenerator:
  """Generate a series of unique keys."""

  def __init__(self, first_id=1):
    """Initialize a KeyGenerator with the specified FIRST_ID.

    FIRST_ID should be an int or long, and the generated keys will be
    of the same type."""

    self._key_base = first_id
    self._last_id = None

  def gen_id(self):
    """Generate and return a previously-unused key, as an integer."""

    self._last_id = self._key_base
    self._key_base += 1

    return self._last_id

  def get_last_id(self):
    """Return the last id that was generated, as an integer."""

    return self._last_id