source: main/waeup.sirp/branches/unique-index/uniquefield.py @ 11107

Last change on this file since 11107 was 6215, checked in by uli, 13 years ago

Remove obsolete stuff.
Fix index field.

File size: 2.0 KB
Line 
1##
2## uniquefield.py
3## Login : <uli@pu.smp.net>
4## Started on  Sat May 28 13:39:15 2011 Uli Fouquet
5## $Id$
6##
7## Copyright (C) 2011 Uli Fouquet
8## This program is free software; you can redistribute it and/or modify
9## it under the terms of the GNU General Public License as published by
10## the Free Software Foundation; either version 2 of the License, or
11## (at your option) any later version.
12##
13## This program is distributed in the hope that it will be useful,
14## but WITHOUT ANY WARRANTY; without even the implied warranty of
15## MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
16## GNU General Public License for more details.
17##
18## You should have received a copy of the GNU General Public License
19## along with this program; if not, write to the Free Software
20## Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
21##
22"""
23Unique field indexes.
24"""
25from grok.index import IndexDefinition
26from zope.catalog.field import FieldIndex
27from zope.index.field import FieldIndex as RawFieldIndex
28from zope.interface import implements
29from waeup.sirp.index.interfaces import IUniqueFieldIndex, IUnique
30
31class RawUniqueFieldIndex(RawFieldIndex):
32    """Unique field index.
33    """
34    implements(IUnique)
35
36    def index_doc(self, docid, value):
37        """Index some doc.
38        """
39        entries = self._fwd_index.get(value, ())
40        if len(entries) > 0 and docid not in entries:
41            # Accept already existing entries if docid matches
42            # ('reindex' use case). If docid is not contained already,
43            # we have a unique-constraint violation.
44            raise KeyError(
45                'The value already exists in catalog: %s' % value,)
46        return super(RawUniqueFieldIndex, self).index_doc(docid, value)
47
48class UniqueFieldIndex(FieldIndex):
49    implements(IUniqueFieldIndex)
50
51class UniqueField(IndexDefinition):
52    """A :class:`grok.Indexes` index that matches against an entire field.
53
54    Contrary to :class:`grok.index.Field` this index only accepts
55    unique values.
56    """
57    index_class = UniqueFieldIndex
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