[Zope-dev] ObjectManagers and their children

Michel Pelletier michel@digicool.com
Mon, 08 Nov 1999 10:45:09 -0500


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Michel Pelletier wrote:
> 
> That's the theory.  Way back in the day, a few months ago, I tried to
> write a BTreeObjectManager that stored it's children in a dictionary (a
> BTree, but it acts just like a dict and it's faster and much more space
> efficient when working with ZODB).  I got pretty far along, and it
> seemed to work ok, but there were bugs I never had time to fix.  It was
> just an experiment.  if I can dig up the code, I'll post it.
> 
> -Michel

Code is attached.  Code is as is, buggy, and purely experimental. 
Consists of two file, BTreeObjectManager.py and BTreeFolder.py.  Both go
in OFS (but it would probably be smart to make a seperate Product).

-Michel
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##############################################################################
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#    require an external acknowledgement.
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#    patches to official Zope releases.  Distributions that do not
#    clearly separate the patches from the original work must be clearly
#    labeled as unofficial distributions.  Modifications which do not
#    carry the name Zope may be packaged in any form, as long as they
#    conform to all of the clauses above.
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# 
# Disclaimer
# 
#   THIS SOFTWARE IS PROVIDED BY DIGITAL CREATIONS ``AS IS'' AND ANY
#   EXPRESSED 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 ITS
#   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.
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# 
# This software consists of contributions made by Digital Creations and
# many individuals on behalf of Digital Creations.  Specific
# attributions are listed in the accompanying credits file.
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##############################################################################
__doc__="""Object Manager

$Id: ObjectManager.py,v 1.80 1999/07/22 19:19:22 jim Exp $"""

__version__='$Revision: 1.80 $'[11:-2]


from BTree import BTree
import ts_regex, Globals
from ObjectManager import ObjectManager

bad_id=ts_regex.compile('[^a-zA-Z0-9-_~\,\. ]').match #TS

_marker=[]
class BTreeObjectManager(ObjectManager):
    """BTree object manager

    This class provides core behavior for collections of heterogeneous
    objects.  It's API is identical to that of the standard Zope
    ObjectManager.  Instead of storing it's objects sequentially, the
    BTreeObjectManager stores its objects in very efficient BTree data
    structures written in C.

    """

    meta_type  ='BTree Object Manager'

    _objects = ()
    _real_objects = BTree()


    def _checkId(self, id, allow_dup=0):
        # If allow_dup is false, an error will be raised if an object
        # with the given id already exists. If allow_dup is true,
        # only check that the id string contains no illegal chars.
        if not id:
            raise 'Bad Request', 'No id was specified'
        if bad_id(id) != -1:
            raise 'Bad Request', (
            'The id %s contains characters illegal in URLs.' % id)
        if id[0]=='_': raise 'Bad Request', (
            'The id %s  is invalid - it begins with an underscore.'  % id)
        if not allow_dup:
            if hasattr(self, 'aq_base'):
                self=self.aq_base
            if self._real_objects.has_key(id):
                raise 'Bad Request', (
                    'The id %s is invalid - it is already in use.' % id)


    def _setOb(self, id, object):
        self._real_objects[id] = object
        
    def _delOb(self, id):
        del self._real_objects[id]
        
    def _getOb(self, id, default=_marker):
        if hasattr(self, 'aq_base'):
            base=self.aq_base
        else: base=self
        if not self._real_objects.has_key(id):
            if default is _marker:
                raise AttributeError, id
            return default
        return self._real_objects[id].__of__(self)


Globals.default__class_init__(BTreeObjectManager)


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##############################################################################
# 
# Zope Public License (ZPL) Version 1.0
# -------------------------------------
# 
# Copyright (c) Digital Creations.  All rights reserved.
# 
# This license has been certified as Open Source(tm).
# 
# Redistribution and use in source and binary forms, with or without
# modification, are permitted provided that the following conditions are
# met:
# 
# 1. Redistributions in source code must retain the above copyright
#    notice, this list of conditions, and the following disclaimer.
# 
# 2. 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.
# 
# 3. Digital Creations requests that attribution be given to Zope
#    in any manner possible. Zope includes a "Powered by Zope"
#    button that is installed by default. While it is not a license
#    violation to remove this button, it is requested that the
#    attribution remain. A significant investment has been put
#    into Zope, and this effort will continue if the Zope community
#    continues to grow. This is one way to assure that growth.
# 
# 4. All advertising materials and documentation mentioning
#    features derived from or use of this software must display
#    the following acknowledgement:
# 
#      "This product includes software developed by Digital Creations
#      for use in the Z Object Publishing Environment
#      (http://www.zope.org/)."
# 
#    In the event that the product being advertised includes an
#    intact Zope distribution (with copyright and license included)
#    then this clause is waived.
# 
# 5. Names associated with Zope or Digital Creations must not be used to
#    endorse or promote products derived from this software without
#    prior written permission from Digital Creations.
# 
# 6. Modified redistributions of any form whatsoever must retain
#    the following acknowledgment:
# 
#      "This product includes software developed by Digital Creations
#      for use in the Z Object Publishing Environment
#      (http://www.zope.org/)."
# 
#    Intact (re-)distributions of any official Zope release do not
#    require an external acknowledgement.
# 
# 7. Modifications are encouraged but must be packaged separately as
#    patches to official Zope releases.  Distributions that do not
#    clearly separate the patches from the original work must be clearly
#    labeled as unofficial distributions.  Modifications which do not
#    carry the name Zope may be packaged in any form, as long as they
#    conform to all of the clauses above.
# 
# 
# Disclaimer
# 
#   THIS SOFTWARE IS PROVIDED BY DIGITAL CREATIONS ``AS IS'' AND ANY
#   EXPRESSED 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 ITS
#   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.
# 
# 
# This software consists of contributions made by Digital Creations and
# many individuals on behalf of Digital Creations.  Specific
# attributions are listed in the accompanying credits file.
# 
##############################################################################

"""Folder object

Folders are the basic container objects and are analogous to directories.

$Id: Folder.py,v 1.82 1999/07/05 14:44:49 jim Exp $"""

__version__='$Revision: 1.82 $'[11:-2]

import Globals, SimpleItem
from BTreeObjectManager import BTreeObjectManager
from PropertyManager import PropertyManager
from AccessControl.Role import RoleManager
from webdav.Collection import Collection
from FindSupport import FindSupport
from Globals import HTMLFile



manage_addBTreeFolderForm=HTMLFile('btreeFolderAdd', globals())

def manage_addBTreeFolder(self, id, title='',
                     createPublic=0,
                     createUserF=0,
                     REQUEST=None):
    """Add a new BTreeFolder object with id *id*.

    If the 'createPublic' and 'createUserF' parameters are set to any true
    value, an 'index_html' and a 'UserBTreeFolder' objects are created respectively
    in the new folder.
    """
    ob=BTreeFolder()
    ob.id=id
    ob.title=title
    self._setObject(id, ob)
    try: user=REQUEST['AUTHENTICATED_USER']
    except: user=None
    if createUserF:
        if (user is not None) and not (
            user.has_permission('Add User Folders', self)):
            raise 'Unauthorized', (
                  'You are not authorized to add User Folders.'
                  )
        ob.manage_addUserFolder()
    if createPublic:
        if (user is not None) and not (
            user.has_permission('Add Documents, Images, and Files', self)):
            raise 'Unauthorized', (
                  'You are not authorized to add DTML Documents.'
                  )
        ob.manage_addDTMLDocument(id='index_html', title='')
    if REQUEST is not None:
        return self.manage_main(self, REQUEST, update_menu=1)



class BTreeFolder(BTreeObjectManager, PropertyManager, RoleManager, Collection,
             SimpleItem.Item, FindSupport):
    """
    The basic container object in Principia.  BTreeFolders can hold almost all
    other Principia objects.
    """
    meta_type='BTree Folder'

    _properties=({'id':'title', 'type': 'string'},)

    manage_options=(
        {'label':'Contents', 'action':'manage_main'},
        {'label':'View', 'action':'index_html'},
        {'label':'Properties', 'action':'manage_propertiesForm'},
        {'label':'Import/Export', 'action':'manage_importExportForm'},
        {'label':'Security', 'action':'manage_access'},
        {'label':'Undo', 'action':'manage_UndoForm'},
        {'label':'Find', 'action':'manage_findFrame', 'target':'manage_main'},
    )

    __ac_permissions__=()


Globals.default__class_init__(BTreeFolder)

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