# Django UUID
#
# Douglas Thrift
#
# $Id$

from django.core import exceptions
from django.db import models
from django.utils.translation import ugettext as _
import uuid

class UUIDField(models.Field):
	__metaclass__ = models.SubfieldBase

	def db_type(self, connection):
		return 'uuid'

	def get_prep_value(self, value):
		if isinstance(value, uuid.UUID):
			return str(value)
			
		return value

	def to_python(self, value):
		if value is None or isinstance(value, uuid.UUID):
			return value

		try:
			return uuid.UUID(value)
		except (AttributeError, ValueError):
			raise exceptions.ValidationError(_('This value must be a UUID.'))