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legacymediuminteger.py
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R3600 invenio-infoscience
legacymediuminteger.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 MediumInteger type."""
from
sqlalchemy.types
import
Integer
,
TypeDecorator
from
sqlalchemy.dialects.mysql
import
MEDIUMINT
class
LegacyMediumInteger
(
TypeDecorator
):
"""Platform-independent MediumInteger type.
Uses MySQL's :class:`~sqlalchemy.dialects.mysql.MEDIUMINT` type, otherwise
uses SQLAlchemy definition of :class:`~sqlalchemy.types.Integer`.
"""
impl
=
Integer
def
__init__
(
self
,
display_width
=
9
,
unsigned
=
False
,
**
kwargs
):
"""Reserve special arguments only for MySQL Platform."""
self
.
display_width
=
display_width
self
.
unsigned
=
unsigned
super
(
LegacyMediumInteger
,
self
)
.
__init__
(
**
kwargs
)
def
load_dialect_impl
(
self
,
dialect
):
"""Load dialect dependent implementation."""
if
dialect
.
name
==
'mysql'
:
return
dialect
.
type_descriptor
(
MEDIUMINT
(
self
.
display_width
,
unsigned
=
self
.
unsigned
))
else
:
return
dialect
.
type_descriptor
(
Integer
)
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