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legacymediuminteger.py
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Thu, Sep 12, 08:50

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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