1 # -*- coding: utf-8 -*-
4 # Copyright (C) 2009-2010 Bolloré telecom
5 # See AUTHORS file for a full list of contributors.
7 # This program is free software: you can redistribute it and/or modify
8 # it under the terms of the GNU General Public License as published by
9 # the Free Software Foundation, either version 3 of the License, or
10 # (at your option) any later version.
12 # This program is distributed in the hope that it will be useful,
13 # but WITHOUT ANY WARRANTY; without even the implied warranty of
14 # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
15 # GNU General Public License for more details.
17 # You should have received a copy of the GNU General Public License
18 # along with this program. If not, see <http://www.gnu.org/licenses/>.
21 from copy import deepcopy
24 from django.db.models.query import QuerySet as BaseQuerySet
25 from django.db.models.query_utils import Q
26 from django.db.models.sql import Query as BaseQuery
27 from django.db.models.sql.where import WhereNode as BaseWhereNode, Constraint as BaseConstraint, AND, OR
31 from ldapdb.models.fields import CharField
33 def get_lookup_operator(lookup_type):
34 if lookup_type == 'gte':
36 elif lookup_type == 'lte':
41 class Constraint(BaseConstraint):
43 An object that can be passed to WhereNode.add() and knows how to
44 pre-process itself prior to including in the WhereNode.
46 def process(self, lookup_type, value):
48 Returns a tuple of data suitable for inclusion in a WhereNode
51 # Because of circular imports, we need to import this here.
52 from django.db.models.base import ObjectDoesNotExist
56 params = self.field.get_db_prep_lookup(lookup_type, value)
57 db_type = self.field.db_type()
59 params = CharField().get_db_prep_lookup(lookup_type, value)
61 except ObjectDoesNotExist:
62 raise EmptyShortCircuit
64 return (self.alias, self.col, db_type), params
66 class WhereNode(BaseWhereNode):
67 def add(self, data, connector):
68 if not isinstance(data, (list, tuple)):
69 super(WhereNode, self).add(data, connector)
72 # we replace the native Constraint by our own
73 obj, lookup_type, value = data
74 if hasattr(obj, "process"):
75 obj = Constraint(obj.alias, obj.col, obj.field)
76 super(WhereNode, self).add((obj, lookup_type, value), connector)
78 def as_sql(self, qn=None, connection=None):
80 for item in self.children:
81 if hasattr(item, 'as_sql'):
82 sql, params = item.as_sql(qn=qn, connection=connection)
86 constraint, lookup_type, y, values = item
87 comp = get_lookup_operator(lookup_type)
88 if hasattr(constraint, "col"):
90 column = constraint.col
91 if lookup_type == 'in':
92 equal_bits = [ "(%s%s%s)" % (column, comp, value) for value in values ]
93 clause = '(|%s)' % ''.join(equal_bits)
95 clause = "(%s%s%s)" % (constraint.col, comp, values)
98 (table, column, db_type) = constraint
99 equal_bits = [ "(%s%s%s)" % (column, comp, value) for value in values ]
100 if len(equal_bits) == 1:
101 clause = equal_bits[0]
103 clause = '(|%s)' % ''.join(equal_bits)
106 bits.append('(!%s)' % clause)
111 elif self.connector == AND:
112 sql_string = '(&%s)' % ''.join(bits)
113 elif self.connector == OR:
114 sql_string = '(|%s)' % ''.join(bits)
116 raise Exception("Unhandled WHERE connector: %s" % self.connector)
117 return sql_string, []
119 class Query(BaseQuery):
120 def __init__(self, *args, **kwargs):
121 super(Query, self).__init__(*args, **kwargs)
122 self.connection = ldapdb.connection
125 filterstr = ''.join(['(objectClass=%s)' % cls for cls in self.model.object_classes])
126 sql, params = self.where.as_sql()
128 filterstr = '(&%s)' % filterstr
131 vals = ldapdb.connection.search_s(
138 raise self.model.DoesNotExist
142 def results_iter(self):
143 filterstr = ''.join(['(objectClass=%s)' % cls for cls in self.model.object_classes])
144 sql, params = self.where.as_sql()
146 filterstr = '(&%s)' % filterstr
147 attrlist = [ x.db_column for x in self.model._meta.local_fields if x.db_column ]
150 vals = ldapdb.connection.search_s(
157 raise self.model.DoesNotExist
160 if self.extra_order_by:
161 ordering = self.extra_order_by
162 elif not self.default_ordering:
163 ordering = self.order_by
165 ordering = self.order_by or self.model._meta.ordering
167 for field in ordering:
168 if field.startswith('-'):
173 attr = self.model._meta.get_field(field).db_column
174 attr_x = x[1].get(attr, '').lower()
175 attr_y = y[1].get(attr, '').lower()
176 val = negate and cmp(attr_y, attr_x) or cmp(attr_x, attr_y)
180 vals = sorted(vals, cmp=cmpvals)
183 for dn, attrs in vals:
185 for field in iter(self.model._meta.fields):
186 if field.attname == 'dn':
189 row.append(attrs.get(field.db_column, None))
192 class QuerySet(BaseQuerySet):
193 def __init__(self, model=None, query=None, using=None):
196 spec = inspect.getargspec(BaseQuery.__init__)
197 if len(spec[0]) == 3:
199 query = Query(model, WhereNode)
202 query = Query(model, None, WhereNode)
203 super(QuerySet, self).__init__(model=model, query=query)