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legacyinteger.py
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Tue, Aug 6, 22:50

legacyinteger.py
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# -*- coding: utf-8 -*-
#
# This file is part of Invenio.
# Copyright (C) 2011, 2012, 2013, 2014, 2015 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 Integer type."""
from sqlalchemy.dialects.mysql import INTEGER
from sqlalchemy.types import Integer, TypeDecorator
class LegacyInteger(TypeDecorator):
"""Platform-independent Integer type.
Uses MySQL's :class:`~sqlalchemy.dialects.mysql.INTEGER` type, otherwise
uses SQLAlchemy definition of :class:`~sqlalchemy.types.Integer`.
"""
impl = Integer
def __init__(self, display_width=15, unsigned=False, **kwargs):
"""Reserve special arguments only for MySQL Platform."""
self.display_width = display_width
self.unsigned = unsigned
super(LegacyInteger, self).__init__(**kwargs)
def load_dialect_impl(self, dialect):
"""Load dialect dependent implementation."""
if dialect.name == 'mysql':
return dialect.type_descriptor(INTEGER(self.display_width,
unsigned=self.unsigned))
else:
return dialect.type_descriptor(Integer)
def process_result_value(self, value, dialect):
"""Cast to long python variable."""
if value is not None:
return long(value)

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