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# Copyright (C) 2007 by the Free Software Foundation, Inc.
#
# This program 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.
#
# This program 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 this program; if not, write to the Free Software
# Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301,
# USA.
import sys
from datetime import timedelta
from sqlalchemy import types
# SQLAlchemy custom type for storing munepy Enums in the database.
class EnumType(types.TypeDecorator):
# Enums can be stored as strings of the form:
# full.path.to.Enum:intval
impl = types.String
def convert_bind_param(self, value, engine):
if value is None:
return None
return '%s.%s:%d' % (value.enumclass.__module__,
value.enumclass.__name__,
int(value))
def convert_result_value(self, value, engine):
if value is None:
return None
path, intvalue = value.rsplit(':', 1)
modulename, classname = path.rsplit('.', 1)
__import__(modulename)
cls = getattr(sys.modules[modulename], classname)
return cls[int(intvalue)]
class TimeDeltaType(types.TypeDecorator):
# timedeltas are stored as the string representation of three integers,
# separated by colons. The values represent the three timedelta
# attributes days, seconds, microseconds.
impl = types.String
def convert_bind_param(self, value, engine):
if value is None:
return None
return '%s:%s:%s' % (value.days, value.seconds, value.microseconds)
def convert_result_value(self, value, engine):
if value is None:
return None
parts = value.split(':')
assert len(parts) == 3, 'Bad timedelta representation: %s' % value
return timedelta(*(int(value) for value in parts))
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