/usr/share/pyshared/elixir/collection.py is in python-elixir 0.7.1-1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 | '''
Default entity collection implementation
'''
import sys
import re
from elixir.py23compat import rsplit
class BaseCollection(list):
def __init__(self, entities=None):
list.__init__(self)
if entities is not None:
self.extend(entities)
def extend(self, entities):
for e in entities:
self.append(e)
def clear(self):
del self[:]
def resolve_absolute(self, key, full_path, entity=None, root=None):
if root is None:
root = entity._descriptor.resolve_root
if root:
full_path = '%s.%s' % (root, full_path)
module_path, classname = rsplit(full_path, '.', 1)
module = sys.modules[module_path]
res = getattr(module, classname, None)
if res is None:
if entity is not None:
raise Exception("Couldn't resolve target '%s' <%s> in '%s'!"
% (key, full_path, entity.__name__))
else:
raise Exception("Couldn't resolve target '%s' <%s>!"
% (key, full_path))
return res
def __getattr__(self, key):
return self.resolve(key)
# default entity collection
class GlobalEntityCollection(BaseCollection):
def __init__(self, entities=None):
# _entities is a dict of entities keyed on their name.
self._entities = {}
super(GlobalEntityCollection, self).__init__(entities)
def append(self, entity):
'''
Add an entity to the collection.
'''
super(EntityCollection, self).append(entity)
existing_entities = self._entities.setdefault(entity.__name__, [])
existing_entities.append(entity)
def resolve(self, key, entity=None):
'''
Resolve a key to an Entity. The optional `entity` argument is the
"source" entity when resolving relationship targets.
'''
# Do we have a fully qualified entity name?
if '.' in key:
return self.resolve_absolute(key, key, entity)
else:
# Otherwise we look in the entities of this collection
res = self._entities.get(key, None)
if res is None:
if entity:
raise Exception("Couldn't resolve target '%s' in '%s'"
% (key, entity.__name__))
else:
raise Exception("This collection does not contain any "
"entity corresponding to the key '%s'!"
% key)
elif len(res) > 1:
raise Exception("'%s' resolves to several entities, you should"
" use the full path (including the full module"
" name) to that entity." % key)
else:
return res[0]
def clear(self):
self._entities = {}
super(GlobalEntityCollection, self).clear()
# backward compatible name
EntityCollection = GlobalEntityCollection
_leading_dots = re.compile('^([.]*).*$')
class RelativeEntityCollection(BaseCollection):
# the entity=None does not make any sense with a relative entity collection
def resolve(self, key, entity):
'''
Resolve a key to an Entity. The optional `entity` argument is the
"source" entity when resolving relationship targets.
'''
full_path = key
if '.' not in key or key.startswith('.'):
# relative target
# any leading dot is stripped and with each dot removed,
# the entity_module is stripped of one more chunk (starting with
# the last one).
num_dots = _leading_dots.match(full_path).end(1)
full_path = full_path[num_dots:]
chunks = entity.__module__.split('.')
chunkstokeep = len(chunks) - num_dots
if chunkstokeep < 0:
raise Exception("Couldn't resolve relative target "
"'%s' relative to '%s'" % (key, entity.__module__))
entity_module = '.'.join(chunks[:chunkstokeep])
if entity_module and entity_module is not '__main__':
full_path = '%s.%s' % (entity_module, full_path)
root = ''
else:
root = None
return self.resolve_absolute(key, full_path, entity, root=root)
def __getattr__(self, key):
raise NotImplementedError
|