## $Id: idgen.py 12288 2014-12-21 17:01:15Z henrik $
##
## Copyright (C) 2014 Uli Fouquet & Henrik Bettermann
## This program is free software; you can redistribute it and/or modify
## it under the terms of the GNU General Public License as published by
## the Free Software Foundation; either version 2 of the License, or
## (at your option) any later version.
##
## This program is distributed in the hope that it will be useful,
## but WITHOUT ANY WARRANTY; without even the implied warranty of
## MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
## GNU General Public License for more details.
##
## You should have received a copy of the GNU General Public License
## along with this program; if not, write to the Free Software
## Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
##
"""ID generators.

Give you unique IDs for objects.
"""
import grok
import uuid
from waeup.ikoba.interfaces import IIDSource


class IDSource(grok.GlobalUtility):
    """This utility provides 'Universally Unique IDentifiers'.

    It is registered without name on startup. You can get an instance
    of this utility with

      >>> from zope.component import getUtility
      >>> from waeup.ikoba.interfaces import IIDSource
      >>> source = getUtility(IIDSource)

    """
    grok.implements(IIDSource)

    @classmethod
    def get_uuid(self):
        """Get a UUID string of 36 hexadecimal chars and hyphens.
        """
        return str(uuid.uuid4())

    @classmethod
    def get_hex_uuid(self):
        """Get a UUID string of 32 hexadecimal chars.
        """
        return uuid.uuid4().hex