+from ldapdb.models.fields import CharField
+
+def get_lookup_operator(lookup_type):
+ if lookup_type == 'gte':
+ return '>='
+ elif lookup_type == 'lte':
+ return '<='
+ else:
+ return '='
+
+class Constraint(BaseConstraint):
+ """
+ An object that can be passed to WhereNode.add() and knows how to
+ pre-process itself prior to including in the WhereNode.
+ """
+ def process(self, lookup_type, value):
+ """
+ Returns a tuple of data suitable for inclusion in a WhereNode
+ instance.
+ """
+ # Because of circular imports, we need to import this here.
+ from django.db.models.base import ObjectDoesNotExist
+
+ try:
+ if self.field:
+ params = self.field.get_db_prep_lookup(lookup_type, value)
+ db_type = self.field.db_type()
+ else:
+ params = CharField().get_db_prep_lookup(lookup_type, value)
+ db_type = None
+ except ObjectDoesNotExist:
+ raise EmptyShortCircuit
+
+ return (self.alias, self.col, db_type), params
+
+class Compiler(object):
+ def __init__(self, query, connection, using):
+ self.query = query
+ self.connection = connection
+ self.using = using
+
+ def results_iter(self):
+ query = self.query
+ attrlist = [ x.db_column for x in query.model._meta.local_fields if x.db_column ]
+
+ try:
+ vals = self.connection.search_s(
+ query.model.base_dn,
+ ldap.SCOPE_SUBTREE,
+ filterstr=query._ldap_filter(),
+ attrlist=attrlist,
+ )
+ except ldap.NO_SUCH_OBJECT:
+ return
+ raise query.model.DoesNotExist
+
+ # perform sorting
+ if query.extra_order_by:
+ ordering = query.extra_order_by
+ elif not query.default_ordering:
+ ordering = query.order_by
+ else:
+ ordering = query.order_by or query.model._meta.ordering
+ def cmpvals(x, y):
+ for fieldname in ordering:
+ if fieldname.startswith('-'):
+ fieldname = fieldname[1:]
+ negate = True
+ else:
+ negate = False
+ field = query.model._meta.get_field(fieldname)
+ attr_x = field.from_ldap(x[1].get(field.db_column, []), connection=self.connection)
+ attr_y = field.from_ldap(y[1].get(field.db_column, []), connection=self.connection)
+ # perform case insensitive comparison
+ if hasattr(attr_x, 'lower'):
+ attr_x = attr_x.lower()
+ if hasattr(attr_y, 'lower'):
+ attr_y = attr_y.lower()
+ val = negate and cmp(attr_y, attr_x) or cmp(attr_x, attr_y)
+ if val:
+ return val
+ return 0
+ vals = sorted(vals, cmp=cmpvals)
+
+ # process results
+ for dn, attrs in vals:
+ row = []
+ for field in iter(query.model._meta.fields):
+ if field.attname == 'dn':
+ row.append(dn)
+ elif hasattr(field, 'from_ldap'):
+ row.append(field.from_ldap(attrs.get(field.db_column, []), connection=self.connection))
+ else:
+ row.append(None)
+ yield row
+
+