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guid.py
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Tue, Sep 3, 05:09

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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