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# DpkgDatalist.py
#
# This module implements DpkgDatalist, an abstract class for storing
# a list of objects in a file. Children of this class have to implement
# the load and _store methods.
#
# Copyright 2001 Wichert Akkerman <wichert@linux.com>
#
# This file 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., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
import os, sys
from UserDict import UserDict
from OrderedDict import OrderedDict
from minidinstall.SafeWriteFile import SafeWriteFile
from types import StringType
class DpkgDatalistException(Exception):
UNKNOWN = 0
SYNTAXERROR = 1
def __init__(self, message="", reason=UNKNOWN, file=None, line=None):
self.message=message
self.reason=reason
self.filename=file
self.line=line
class _DpkgDatalist:
def __init__(self, fn=""):
'''Initialize a DpkgDatalist object. An optional argument is a
file from which we load values.'''
self.filename=fn
if self.filename:
self.load(self.filename)
def store(self, fn=None):
"Store variable data in a file."
if fn==None:
fn=self.filename
# Special case for writing to stdout
if not fn:
self._store(sys.stdout)
return
# Write to a temporary file first
if type(fn) == StringType:
vf=SafeWriteFile(fn+".new", fn, "w")
else:
vf=fn
try:
self._store(vf)
finally:
if type(fn) == StringType:
vf.close()
class DpkgDatalist(UserDict, _DpkgDatalist):
def __init__(self, fn=""):
UserDict.__init__(self)
_DpkgDatalist.__init__(self, fn)
class DpkgOrderedDatalist(OrderedDict, _DpkgDatalist):
def __init__(self, fn=""):
OrderedDict.__init__(self)
_DpkgDatalist.__init__(self, fn)
# vim:ts=4:sw=4:et:
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