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guid.py
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Tue, Sep 3, 05:09
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text/x-python
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R3600 invenio-infoscience
guid.py
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# -*- coding: utf-8 -*-
#
## This file is part of Invenio.
## Copyright (C) 2011, 2012, 2013, 2014 CERN.
##
## Invenio 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.
##
## Invenio 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 Invenio; if not, write to the Free Software Foundation, Inc.,
## 59 Temple Place, Suite 330, Boston, MA 02111-1307, USA.
"""Platform-independent GUID type."""
import
uuid
from
sqlalchemy.types
import
TypeDecorator
,
CHAR
from
sqlalchemy.dialects.postgresql
import
UUID
class
GUID
(
TypeDecorator
):
"""Platform-independent GUID type.
Uses Postgresql's `UUID` type, otherwise uses
`CHAR(32)`, storing as stringified hex values.
"""
impl
=
CHAR
def
load_dialect_impl
(
self
,
dialect
):
"""Load dialect dependent implementation of UUID."""
if
dialect
.
name
==
'postgresql'
:
return
dialect
.
type_descriptor
(
UUID
())
else
:
return
dialect
.
type_descriptor
(
CHAR
(
32
))
def
process_bind_param
(
self
,
value
,
dialect
):
"""Create UUID representation for given dialect."""
if
value
is
None
:
return
value
elif
dialect
.
name
==
'postgresql'
:
return
str
(
value
)
else
:
if
not
isinstance
(
value
,
uuid
.
UUID
):
return
"
%.32x
"
%
uuid
.
UUID
(
value
)
else
:
# hexstring
return
"
%.32x
"
%
value
def
process_result_value
(
self
,
value
,
dialect
):
"""Create UUID instance."""
if
value
is
None
:
return
value
else
:
return
uuid
.
UUID
(
value
)
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