style.
[Plinn.git] / HugePlinnFolder.py
1 # -*- coding: utf-8 -*-
2 #######################################################################################
3 # Plinn - http://plinn.org #
4 # Copyright (C) 2005-2007 BenoƮt 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