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##############################################################################
#
# Copyright (c) 1996-1998, Digital Creations, Fredericksburg, VA, USA.
# All rights reserved.
#
# Redistribution and use in source and binary forms, with or without
# modification, are permitted provided that the following conditions are
# met:
#
# o Redistributions of source code must retain the above copyright
# notice, this list of conditions, and the disclaimer that follows.
#
# o Redistributions in binary form must reproduce the above copyright
# notice, this list of conditions, and the following disclaimer in
# the documentation and/or other materials provided with the
# distribution.
#
# o Neither the name of Digital Creations nor the names of its
# contributors may be used to endorse or promote products derived
# from this software without specific prior written permission.
#
#
# THIS SOFTWARE IS PROVIDED BY DIGITAL CREATIONS AND CONTRIBUTORS *AS IS*
# AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
# TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A
# PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL DIGITAL
# CREATIONS OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
# INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
# BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
# OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
# ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR
# TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE
# USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH
# DAMAGE.
#
#
# If you have questions regarding this software, contact:
#
# Digital Creations, L.C.
# 910 Princess Ann Street
# Fredericksburge, Virginia 22401
#
# info@digicool.com
#
# (540) 371-6909
#
##############################################################################
__doc__='''Python PickleJar base
$Id: pPickleJar.py,v 1.4 1998/10/23 21:45:20 jim Exp $'''
__version__='$Revision: 1.4 $'[11:-2]
from cStringIO import StringIO
from cPickle import Pickler
class PickleJar:
def new_oid(self):
oid=self.oid+1
self.oid=oid
return oid
def store(self,object,T=None):
plan=self.planToStore
stack=[]
topoid=plan(object,stack)
if stack:
file=StringIO()
if T is None: m=''
else: m=T.info()
# Create a special persistent_id that passes T and the subobject
# stack along:
def persistent_id(object,self=self,stack=stack):
if (not hasattr(object, '_p_oid') or
not hasattr(object, '__class__')
): return None
oid=object._p_oid
if oid is None or object._p_jar is not self:
oid = self.new_oid()
object._p_jar=self
object._p_oid=oid
stack.append(object)
elif object._p_changed:
stack.append(object)
if hasattr(object.__class__, '__getinitargs__'): return oid
return oid, object.__class__
pickler=Pickler(file,1)
pickler.persistent_id=persistent_id
dbstore=self.db.store
seek=file.seek
file=file.getvalue
cache=self.cache
dump=pickler.dump
clear_memo=pickler.clear_memo
while stack:
object=stack[-1]
del stack[-1]
oid=object._p_oid
cls = object.__class__
if hasattr(cls, '__getinitargs__'):
args = object.__getinitargs__()
len(args) # XXX Assert it's a sequence
else:
args = None # New no-constructor protocol!
seek(0)
clear_memo()
dump((cls,args))
state=object.__getstate__()
dump(state)
p=file(1)
dbstore(oid,p,m)
object.__changed__(0)
cache[oid]=object
return topoid
def planToStore(self,object,stack):
oid=object._p_oid
if oid is None or object._p_jar is not self:
oid = self.new_oid()
object._p_jar=self
object._p_oid=oid
stack.append(object)
elif object._p_changed:
stack.append(object)
return oid
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