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marshal_binary.py
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Created
Mon, Jul 29, 02:30
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text/x-python
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Wed, Jul 31, 02:30 (1 d, 22 h)
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R3600 invenio-infoscience
marshal_binary.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.
"""Implement compressed column type."""
from
sqlalchemy.types
import
TypeDecorator
,
LargeBinary
from
invenio.utils.serializers
import
ZlibMarshal
class
MarshalBinary
(
TypeDecorator
):
"""Implement compressed column type."""
impl
=
LargeBinary
def
__init__
(
self
,
default_value
,
force_type
=
None
,
*
args
,
**
kwargs
):
"""Initialize default value and type."""
super
(
MarshalBinary
,
self
)
.
__init__
(
*
args
,
**
kwargs
)
self
.
default_value
=
default_value
self
.
force_type
=
force_type
if
force_type
is
not
None
else
lambda
x
:
x
def
process_bind_param
(
self
,
value
,
dialect
):
"""Compress data in column."""
if
value
is
not
None
:
value
=
ZlibMarshal
.
dumps
(
self
.
force_type
(
value
))
return
value
return
value
def
process_result_value
(
self
,
value
,
dialect
):
"""Load comressed data from column."""
if
value
is
not
None
:
try
:
value
=
ZlibMarshal
.
loads
(
value
)
except
:
value
=
None
return
value
if
value
is
not
None
else
\
(
self
.
default_value
()
if
callable
(
self
.
default_value
)
else
self
.
default_value
)
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