HugePlinnFolder.py

   1 # -*- coding: utf-8 -*-
   2 #######################################################################################
   3 #   Plinn - http://plinn.org                                                          #
   4 #   Copyright (C) 2005-2007  Benoît PIN <benoit.pin@ensmp.fr>                         #
   5 #                                                                                     #
   6 #   This program is free software; you can redistribute it and/or                     #
   7 #   modify it under the terms of the GNU General Public License                       #
   8 #   as published by the Free Software Foundation; either version 2                    #
   9 #   of the License, or (at your option) any later version.                            #
  10 #                                                                                     #
  11 #   This program is distributed in the hope that it will be useful,                   #
  12 #   but WITHOUT ANY WARRANTY; without even the implied warranty of                    #
  13 #   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the                     #
  14 #   GNU General Public License for more details.                                      #
  15 #                                                                                     #
  16 #   You should have received a copy of the GNU General Public License                 #
  17 #   along with this program; if not, write to the Free Software                       #
  18 #   Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA.   #
  19 #######################################################################################
  20 """ Plinn implementation of CMFBTree
  21
  22
  23
  24 """
  25
  26
  27 from Products.BTreeFolder2.BTreeFolder2 import BTreeFolder2Base
  28 from Products.ZCatalog.Lazy import LazyMap
  29 from BTrees.IOBTree import IOBTree
  30 from BTrees.OIBTree import OIBTree
  31 from Folder import PlinnFolder
  32 from zope.event import notify
  33 try :
  34     from zope.app.container.contained import notifyContainerModified
  35 except ImportError :
  36     ## Zope-2.13 compat
  37     from zope.container.contained import notifyContainerModified
  38 from events import ObjectPositionModified
  39 from zope.component.factory import Factory
  40 from Products.CMFCore.permissions import AddPortalFolders, \
  41                                          ManageProperties, \
  42                                          AccessContentsInformation
  43 from AccessControl import ClassSecurityInfo
  44 from Globals import InitializeClass
  45 from types import StringType
  46
  47
  48 class HugePlinnFolder(BTreeFolder2Base, PlinnFolder) :
  49     """ Plinn Folder for large set of objects
  50     """
  51
  52     security = ClassSecurityInfo()
  53
  54     __getitem__ = PlinnFolder.__getitem__
  55
  56     def __init__(self, id, title='') :
  57         PlinnFolder.__init__(self, id, title)
  58         BTreeFolder2Base.__init__(self, id)
  59
  60     def _initBTrees(self):
  61         super(HugePlinnFolder, self)._initBTrees()
  62         self._pos2id_index = IOBTree()
  63         self._id2pos_index = OIBTree()
  64
  65     def _checkId(self, id, allow_dup=0) :
  66         PlinnFolder._checkId(self, id, allow_dup)
  67         BTreeFolder2Base._checkId(self, id, allow_dup)
  68
  69     security.declareProtected(AddPortalFolders, 'manage_addHugePlinnFolder')
  70     def manage_addHugePlinnFolder(self, id, title='', REQUEST=None) :
  71         """ Add new a new HugePlinnFolder object with id *id*.
  72         """
  73         ob = HugePlinnFolder(id, title)
  74         self._setObject(id, ob)
  75         if REQUEST is not None :
  76             return self.folder_contents(self, REQUEST, portal_status_message='Folder added')
  77
  78     def _setOb(self, id, object):
  79         super(HugePlinnFolder, self)._setOb(id, object)
  80         pos = self.objectCount() - 1
  81         self._pos2id_index[pos] = id
  82         self._id2pos_index[id] = pos
  83
  84     def _delOb(self, id):
  85         pos = self._id2pos_index[id]
  86         self._id2pos_index.pop(id)
  87
  88         for p in xrange(pos+1, self.objectCount()) :
  89             ident = self._pos2id_index[p]
  90             self._pos2id_index[p-1] = ident
  91             self._id2pos_index[ident] = p-1
  92
  93         self._pos2id_index.pop(self.objectCount()-1)
  94
  95         super(HugePlinnFolder, self)._delOb(id)
  96
  97     security.declareProtected(AccessContentsInformation, 'objectIds')
  98     def objectIds(self, spec=None) :
  99         if spec is not None :
 100             return super(HugePlinnFolder, self).objectIds(spec)
 101
 102         pos2id = lambda pos : self._pos2id_index[pos]
 103         return LazyMap(pos2id, xrange(self.objectCount()))
 104
 105
 106
 107     security.declareProtected(ManageProperties, 'moveObjectsByDelta')
 108     def moveObjectsByDelta(self, ids, delta, subset_ids=None,
 109                            suppress_events=False):
 110         """ Move specified sub-objects by delta.
 111         """
 112         if isinstance(ids, StringType):
 113             ids = (ids,)
 114
 115         id2pos = self._id2pos_index
 116         pos2id = self._pos2id_index
 117         for id in ids :
 118             oldPosition = id2pos[id]
 119             newPosition = max(oldPosition + delta, 0)
 120
 121             shift = delta > 0 and 1 or -1
 122             for p in xrange(oldPosition, newPosition, shift) :
 123                 ident = pos2id[p+shift]
 124                 pos2id[p] = ident
 125                 id2pos[ident] = p
 126                 if not suppress_events :
 127                     notify(ObjectPositionModified(self[ident], self, p))
 128
 129             id2pos[id] = newPosition
 130             pos2id[newPosition] = id
 131             if not suppress_events :
 132                 notify(ObjectPositionModified(self[id], self, newPosition))
 133
 134         if not suppress_events :
 135             notifyContainerModified(self)
 136
 137     security.declareProtected(ManageProperties, 'moveObjectsAfter')
 138     def moveObjectsAfter(self, ids, targetId, suppress_events=False):
 139         assert targetId not in ids
 140
 141         id2pos = self._id2pos_index
 142         pos2id = self._pos2id_index
 143         targetPos = id2pos[targetId]
 144         minMovedPos = min([id2pos[id] for id in ids])
 145         maxMovedPos = max([id2pos[id] for id in ids])
 146
 147         for id in ids :
 148             assert id == pos2id.pop(id2pos.pop(id))
 149
 150         id2posUpdate = {}
 151         pos2idUpdate = {}
 152
 153         if targetPos < minMovedPos :
 154             # selection moved before the first item position
 155             for i, id in enumerate(ids) :
 156                 pos = i + targetPos + 1
 157                 id2posUpdate[id] = pos
 158                 pos2idUpdate[pos] = id
 159
 160             for id in IndexIterator(pos2id, targetPos+1, maxMovedPos):
 161                 pos = pos + 1
 162                 id2posUpdate[id] = pos
 163                 pos2idUpdate[pos] = id
 164
 165         elif targetPos > minMovedPos and targetPos < maxMovedPos :
 166             # selection moved between the first and last item positions
 167             pos = minMovedPos
 168             # move items placed between the first item position and the target position
 169             for id in IndexIterator(pos2id, minMovedPos+1, targetPos) :
 170                 id2posUpdate[id] = pos
 171                 pos2idUpdate[pos] = id
 172                 pos += 1
 173             # move selected items
 174             for id in ids :
 175                 id2posUpdate[id] = pos
 176                 pos2idUpdate[pos] = id
 177                 pos += 1
 178             # move items positioned between the target position and the moved item max position
 179             for id in IndexIterator(pos2id, targetPos+1, maxMovedPos) :
 180                 id2posUpdate[id] = pos
 181                 pos2idUpdate[pos] = id
 182                 pos += 1
 183
 184         else :
 185             # selection moved after the last item position
 186             pos = minMovedPos
 187             for id in IndexIterator(pos2id, minMovedPos+1, targetPos) :
 188                 id2posUpdate[id] = pos
 189                 pos2idUpdate[pos] = id
 190                 pos += 1
 191
 192             pos = targetPos - len(ids) + 1
 193             for id in ids :
 194                 id2posUpdate[id] = pos
 195                 pos2idUpdate[pos] = id
 196                 pos +=1
 197
 198         id2pos.update(id2posUpdate)
 199         pos2id.update(pos2idUpdate)
 200
 201         if not suppress_events :
 202             for id, pos in id2posUpdate.items() :
 203                 notify(ObjectPositionModified(self[id], self, pos))
 204
 205             notifyContainerModified(self)
 206
 207     def getObjectPosition(self, id):
 208         """ Get the position of an object by its id.
 209         """
 210         try :
 211             return self._id2pos_index[id]
 212         except KeyError :
 213             raise ValueError('The object with the id "%s" does not exist.' % id)
 214
 215
 216 class IndexIterator :
 217     def __init__(self, d, start, stop) :
 218         self.d = d
 219         self.pos = start
 220         self.stop = stop
 221
 222     def __iter__(self) :
 223         return self
 224
 225     def next(self) :
 226         try :
 227             if self.pos > self.stop :
 228                 raise StopIteration
 229             v = self.d[self.pos]
 230             self.pos = self.pos + 1
 231             return v
 232         except KeyError :
 233             self.pos = self.pos + 1
 234             return self.next()
 235
 236
 237 InitializeClass(HugePlinnFolder)
 238 HugePlinnFolderFactory = Factory(HugePlinnFolder)
 239 manage_addHugePlinnFolder = HugePlinnFolder.manage_addHugePlinnFolder.im_func