introduced dependency to lgc > 0.47 for new stacklevel argument to deprecated + new db backup/restore api
"""relation tags store
:organization: Logilab
:copyright: 2001-2010 LOGILAB S.A. (Paris, FRANCE), license is LGPL v2.
:contact: http://www.logilab.fr/ -- mailto:contact@logilab.fr
:license: GNU Lesser General Public License, v2.1 - http://www.gnu.org/licenses
"""
__docformat__ = "restructuredtext en"
import logging
from logilab.common.logging_ext import set_log_methods
RTAGS = []
def register_rtag(rtag):
RTAGS.append(rtag)
def _ensure_str_key(key):
return tuple(str(k) for k in key)
class RelationTags(object):
"""a tag store for full relation definitions :
(subject type, relation type, object type, tagged)
allowing to set tags using wildcard (eg '*') as subject type / object type
This class associates a single tag to each key.
"""
_allowed_values = None
_initfunc = None
def __init__(self, name=None, initfunc=None, allowed_values=None):
self._name = name or '<unknown>'
self._tagdefs = {}
if allowed_values is not None:
self._allowed_values = allowed_values
if initfunc is not None:
self._initfunc = initfunc
register_rtag(self)
def __repr__(self):
return '%s: %s' % (self._name, repr(self._tagdefs))
# dict compat
def __getitem__(self, key):
return self.get(*key)
__contains__ = __getitem__
def clear(self):
self._tagdefs.clear()
def _get_keys(self, stype, rtype, otype, tagged):
keys = [('*', rtype, '*', tagged),
('*', rtype, otype, tagged),
(stype, rtype, '*', tagged),
(stype, rtype, otype, tagged)]
if stype == '*' or otype == '*':
keys.remove( ('*', rtype, '*', tagged) )
if stype == '*':
keys.remove( ('*', rtype, otype, tagged) )
if otype == '*':
keys.remove( (stype, rtype, '*', tagged) )
return keys
def init(self, schema, check=True):
# XXX check existing keys against schema
if check:
for (stype, rtype, otype, tagged), value in self._tagdefs.items():
for ertype in (stype, rtype, otype):
if ertype != '*' and not ertype in schema:
self.warning('removing rtag %s: %s, %s undefined in schema',
(stype, rtype, otype, tagged), value, ertype)
self.del_rtag(stype, rtype, otype, tagged)
break
if self._initfunc is not None:
for eschema in schema.entities():
for rschema, tschemas, role in eschema.relation_definitions(True):
for tschema in tschemas:
if role == 'subject':
sschema, oschema = eschema, tschema
else:
sschema, oschema = tschema, eschema
self._initfunc(self, sschema, rschema, oschema, role)
# rtag declaration api ####################################################
def tag_attribute(self, key, *args, **kwargs):
key = list(key)
key.append('*')
key.append('subject')
self.tag_relation(key, *args, **kwargs)
def tag_subject_of(self, key, *args, **kwargs):
key = list(key)
key.append('subject')
self.tag_relation(key, *args, **kwargs)
def tag_object_of(self, key, *args, **kwargs):
key = list(key)
key.append('object')
self.tag_relation(key, *args, **kwargs)
def tag_relation(self, key, tag):
if self._allowed_values is not None:
assert tag in self._allowed_values, \
'%r is not an allowed tag (should be in %s)' % (
tag, self._allowed_values)
self._tagdefs[_ensure_str_key(key)] = tag
return tag
# rtag runtime api ########################################################
def del_rtag(self, *key):
del self._tagdefs[key]
def get(self, *key):
for key in reversed(self._get_keys(*key)):
try:
return self._tagdefs[key]
except KeyError:
continue
return None
def etype_get(self, etype, rtype, role, ttype='*'):
if role == 'subject':
return self.get(etype, rtype, ttype, role)
return self.get(ttype, rtype, etype, role)
class RelationTagsSet(RelationTags):
"""This class associates a set of tags to each key.
"""
tag_container_cls = set
def tag_relation(self, key, tag):
rtags = self._tagdefs.setdefault(_ensure_str_key(key),
self.tag_container_cls())
rtags.add(tag)
return rtags
def get(self, stype, rtype, otype, tagged):
rtags = self.tag_container_cls()
for key in self._get_keys(stype, rtype, otype, tagged):
try:
rtags.update(self._tagdefs[key])
except KeyError:
continue
return rtags
class RelationTagsDict(RelationTagsSet):
"""This class associates a set of tags to each key."""
tag_container_cls = dict
def tag_relation(self, key, tag):
key = _ensure_str_key(key)
try:
rtags = self._tagdefs[key]
rtags.update(tag)
return rtags
except KeyError:
self._tagdefs[key] = tag
return tag
def setdefault(self, key, tagkey, tagvalue):
key = _ensure_str_key(key)
try:
rtags = self._tagdefs[key]
rtags.setdefault(tagkey, tagvalue)
return rtags
except KeyError:
self._tagdefs[key] = {tagkey: tagvalue}
return self._tagdefs[key]
class RelationTagsBool(RelationTags):
_allowed_values = frozenset((True, False))
set_log_methods(RelationTags, logging.getLogger('cubicweb.rtags'))