senaite.core.schema.uidreferencefield.UIDReferenceField.__init__() - Code Metrics - Inspection of "Added UID reference field/widget for Dexterity Con..." - senaite/senaite.core - Measure and Improve Code Quality continuously with Scrutinizer

Passed

Pull Request — 2.x (#1864)

by Ramon

created 2021-10-24 05:33 UTC

UIDReferenceField.init() A

↳ Parent: senaite.core.schema.uidreferencefield

Complexity

Conditions

Size

Total Lines	6
Code Lines	6

Duplication

Lines	0
Ratio	0 %

Importance

Changes

Metric	Value
eloc	6
dl	0
loc	6
rs	10
c	0
b	0
f	0
cc	2
nop	4

# -*- coding: utf-8 -*-

import six

from bika.lims import api
from persistent.dict import PersistentDict
from persistent.list import PersistentList
from senaite.core import logger
from senaite.core.schema.fields import BaseField
from senaite.core.schema.interfaces import IUIDReferenceField
from zope.annotation.interfaces import IAnnotations
from zope.interface import implementer
from zope.schema import ASCIILine
from Acquisition import aq_base
from zope.schema import List

BACKREFS_STORAGE = "senaite.core.schema.uidreferencefield.backreferences"


def get_brefs(context, relationship, as_objects=False):
    """Return backreferences of the context

    :returns: List of UIDs that are linked by the relationship
    """
    context = aq_base(context)
    # get the bref annotation storage of the context
    brefs = get_bref_storage(context)
    # get the referenced UIDs
    bref_uids = list(brefs.get(relationship, []))

    if not bref_uids:
        return []

    if as_objects is True:
        return [api.get_object(uid) for uid in bref_uids]

    return bref_uids


def get_bref_storage(context):
    """Get the annotation storage for backreferences of the context
    """
    annotation = IAnnotations(context)
    if annotation.get(BACKREFS_STORAGE) is None:

        annotation[BACKREFS_STORAGE] = PersistentDict()
    return annotation[BACKREFS_STORAGE]


@implementer(IUIDReferenceField)
class UIDReferenceField(List, BaseField):
    """Stores UID references to other objects
    """

    value_type = ASCIILine(title=u"UID")

    def __init__(self, allowed_types=None, multi_valued=True, **kw):
        if allowed_types is None:
            allowed_types = ()
        self.allowed_types = allowed_types
        self.multi_valued = multi_valued
        super(UIDReferenceField, self).__init__(**kw)

    def get_relationship_key(self, context):
        """Relationship key used for backreferences

        The key used for the annotation storage on the referenced object to
        remember the current object UID.

        :returns: storage key to lookup back references
        """
        portal_type = api.get_portal_type(context)
        return "%s.%s" % (portal_type, self.__name__)

    def get_uid(self, value):
        """Value -> UID

        :parm value: object/UID/SuperModel
        :returns: UID
        """
        try:
            return api.get_uid(value)
        except api.APIError:
            return None

    def get_object(self, value):
        """Value -> object

        :returns: Object or None
        """
        try:
            return api.get_object(value)
        except api.APIError:
            return None

    def get_allowed_types(self):
        """Returns the allowed reference types

        :returns: tuple of allowed_types
        """
        allowed_types = self.allowed_types
        if not allowed_types:
            allowed_types = ()
        elif isinstance(allowed_types, six.string_types):
            allowed_types = (allowed_types, )
        return allowed_types

    def set(self, object, value):
        """Set UID reference

        :param object: the instance of the field
        :param value: object/UID/SuperModel
        :type value: list/tuple/str
        """

        # always handle all values internally as a list
        if isinstance(value, six.string_types):
            value = [value]
        elif api.is_object(value):
            value = [value]

        # check if the fields accepts single values only
        if not self.multi_valued and len(value) > 1:
            raise TypeError("Single valued field accepts at most 1 value")

        # check if the type is allowed
        allowed_types = self.get_allowed_types()
        if allowed_types:
            objs = filter(None, map(self.get_object, value))
            types = set(map(api.get_portal_type, objs))
            if not types.issubset(allowed_types):
                raise TypeError("Only the following types are allowed: %s"
                                % ",".join(allowed_types))

        # convert to UIDs
        uids = []
        for v in value:
            uid = self.get_uid(v)
            if uid is None:
                continue
            uids.append(uid)

        # current set UIDs
        existing = self.get_raw(object)

        # filter out new/removed UIDs
        added_uids = [u for u in uids if u not in existing]
        added_objs = filter(None, map(self.get_object, added_uids))

        removed_uids = [u for u in existing if u not in uids]
        removed_objs = filter(None, map(self.get_object, removed_uids))

        # link backreferences of new uids
        for added_obj in added_objs:
            self.link_bref(added_obj, object)

        # unlink backreferences of removed UIDs
        for removed_obj in removed_objs:
            self.unlink_bref(removed_obj, object)

        super(UIDReferenceField, self).set(object, uids)

    def unlink_bref(self, source, target):
        """Remove backreference from the source to the target

        :param source: the object where the bref is stored (our reference)
        :param target: the object where the bref points to (our object)
        :returns: True when the bref was removed, False otherwise
        """
        target_uid = self.get_uid(target)
        # get the storage key
        key = self.get_relationship_key(target)
        # get all backreferences from the source
        brefs = get_bref_storage(source)
        if key not in brefs:
            logger.warn(
                "Referenced object {} has no backreferences for the key {}"
                .format(repr(source), key))
            return False
        if target_uid not in brefs[key]:
            logger.warn("Target {} was not linked by {}"
                        .format(repr(target), repr(source)))
            return False
        brefs[key].remove(target_uid)
        return True

    def link_bref(self, source, target):
        """Add backreference from the source to the target

        :param source: the object where the bref is stored (our reference)
        :param target: the object where the bref points to (our object)
        :returns: True when the bref was written
        """
        target_uid = api.get_uid(target)
        # get the annotation storage key
        key = self.get_relationship_key(target)
        # get all backreferences
        brefs = get_bref_storage(source)
        if key not in brefs:
            brefs[key] = PersistentList()
        if target_uid not in brefs[key]:
            brefs[key].append(target_uid)
        return True

    def get(self, object):
        """Get referenced objects

        :param object: instance of the field
        :returns: list of referenced objects
        """
        return self._get(object, as_objects=True)

    def get_raw(self, object):
        """Get referenced UIDs

        :param object: instance of the field
        :returns: list of referenced UIDs
        """
        return self._get(object, as_objects=False)

    def _get(self, object, as_objects=False):
        """Returns single/multi value

        :param object: instance of the field
        :param as_objects: Flag for UID/object returns
        :returns: list of referenced UIDs
        """
        uids = super(UIDReferenceField, self).get(object)

        if not uids:
            uids = []

        if as_objects is True:
            uids = filter(None, map(self.get_object, uids))

        if self.multi_valued:
            return uids
        if len(uids) == 0:
            return None
        return uids[0]


1			# -- coding: utf-8 --
2
3			import six
4
5			from bika.lims import api
6			from persistent.dict import PersistentDict
7			from persistent.list import PersistentList
8			from senaite.core import logger
9			from senaite.core.schema.fields import BaseField
10			from senaite.core.schema.interfaces import IUIDReferenceField
11			from zope.annotation.interfaces import IAnnotations
12			from zope.interface import implementer
13			from zope.schema import ASCIILine
14			from Acquisition import aq_base
15			from zope.schema import List
16
17			BACKREFS_STORAGE = "senaite.core.schema.uidreferencefield.backreferences"
18
19
20			def get_brefs(context, relationship, as_objects=False):
21			"""Return backreferences of the context
22
23			:returns: List of UIDs that are linked by the relationship
24			"""
25			context = aq_base(context)
26			# get the bref annotation storage of the context
27			brefs = get_bref_storage(context)
28			# get the referenced UIDs
29			bref_uids = list(brefs.get(relationship, []))
30
31			if not bref_uids:
32			return []
33
34			if as_objects is True:
35			return [api.get_object(uid) for uid in bref_uids]
36
37			return bref_uids
38
39
40			def get_bref_storage(context):
41			"""Get the annotation storage for backreferences of the context
42			"""
43			annotation = IAnnotations(context)
44			if annotation.get(BACKREFS_STORAGE) is None:
			0 ignored issues – show Comprehensibility Best Practice introduced 2021-10-21 15:27 UTC by Report Bug Copy Issue Report The variable `BACKREFS_STORAGE` does not seem to be defined. Loading history...
45			annotation[BACKREFS_STORAGE] = PersistentDict()
46			return annotation[BACKREFS_STORAGE]
47
48
49			@implementer(IUIDReferenceField)
50			class UIDReferenceField(List, BaseField):
51			"""Stores UID references to other objects
52			"""
53
54			value_type = ASCIILine(title=u"UID")
55
56			def __init__(self, allowed_types=None, multi_valued=True, **kw):
57			if allowed_types is None:
58			allowed_types = ()
59			self.allowed_types = allowed_types
60			self.multi_valued = multi_valued
61			super(UIDReferenceField, self).__init__(**kw)
62
63			def get_relationship_key(self, context):
64			"""Relationship key used for backreferences
65
66			The key used for the annotation storage on the referenced object to
67			remember the current object UID.
68
69			:returns: storage key to lookup back references
70			"""
71			portal_type = api.get_portal_type(context)
72			return "%s.%s" % (portal_type, self.__name__)
73
74			def get_uid(self, value):
75			"""Value -> UID
76
77			:parm value: object/UID/SuperModel
78			:returns: UID
79			"""
80			try:
81			return api.get_uid(value)
82			except api.APIError:
83			return None
84
85			def get_object(self, value):
86			"""Value -> object
87
88			:returns: Object or None
89			"""
90			try:
91			return api.get_object(value)
92			except api.APIError:
93			return None
94
95			def get_allowed_types(self):
96			"""Returns the allowed reference types
97
98			:returns: tuple of allowed_types
99			"""
100			allowed_types = self.allowed_types
101			if not allowed_types:
102			allowed_types = ()
103			elif isinstance(allowed_types, six.string_types):
104			allowed_types = (allowed_types, )
105			return allowed_types
106
107			def set(self, object, value):
108			"""Set UID reference
109
110			:param object: the instance of the field
111			:param value: object/UID/SuperModel
112			:type value: list/tuple/str
113			"""
114
115			# always handle all values internally as a list
116			if isinstance(value, six.string_types):
117			value = [value]
118			elif api.is_object(value):
119			value = [value]
120
121			# check if the fields accepts single values only
122			if not self.multi_valued and len(value) > 1:
123			raise TypeError("Single valued field accepts at most 1 value")
124
125			# check if the type is allowed
126			allowed_types = self.get_allowed_types()
127			if allowed_types:
128			objs = filter(None, map(self.get_object, value))
129			types = set(map(api.get_portal_type, objs))
130			if not types.issubset(allowed_types):
131			raise TypeError("Only the following types are allowed: %s"
132			% ",".join(allowed_types))
133
134			# convert to UIDs
135			uids = []
136			for v in value:
137			uid = self.get_uid(v)
138			if uid is None:
139			continue
140			uids.append(uid)
141
142			# current set UIDs
143			existing = self.get_raw(object)
144
145			# filter out new/removed UIDs
146			added_uids = [u for u in uids if u not in existing]
147			added_objs = filter(None, map(self.get_object, added_uids))
148
149			removed_uids = [u for u in existing if u not in uids]
150			removed_objs = filter(None, map(self.get_object, removed_uids))
151
152			# link backreferences of new uids
153			for added_obj in added_objs:
154			self.link_bref(added_obj, object)
155
156			# unlink backreferences of removed UIDs
157			for removed_obj in removed_objs:
158			self.unlink_bref(removed_obj, object)
159
160			super(UIDReferenceField, self).set(object, uids)
161
162			def unlink_bref(self, source, target):
163			"""Remove backreference from the source to the target
164
165			:param source: the object where the bref is stored (our reference)
166			:param target: the object where the bref points to (our object)
167			:returns: True when the bref was removed, False otherwise
168			"""
169			target_uid = self.get_uid(target)
170			# get the storage key
171			key = self.get_relationship_key(target)
172			# get all backreferences from the source
173			brefs = get_bref_storage(source)
174			if key not in brefs:
175			logger.warn(
176			"Referenced object {} has no backreferences for the key {}"
177			.format(repr(source), key))
178			return False
179			if target_uid not in brefs[key]:
180			logger.warn("Target {} was not linked by {}"
181			.format(repr(target), repr(source)))
182			return False
183			brefs[key].remove(target_uid)
184			return True
185
186			def link_bref(self, source, target):
187			"""Add backreference from the source to the target
188
189			:param source: the object where the bref is stored (our reference)
190			:param target: the object where the bref points to (our object)
191			:returns: True when the bref was written
192			"""
193			target_uid = api.get_uid(target)
194			# get the annotation storage key
195			key = self.get_relationship_key(target)
196			# get all backreferences
197			brefs = get_bref_storage(source)
198			if key not in brefs:
199			brefs[key] = PersistentList()
200			if target_uid not in brefs[key]:
201			brefs[key].append(target_uid)
202			return True
203
204			def get(self, object):
205			"""Get referenced objects
206
207			:param object: instance of the field
208			:returns: list of referenced objects
209			"""
210			return self._get(object, as_objects=True)
211
212			def get_raw(self, object):
213			"""Get referenced UIDs
214
215			:param object: instance of the field
216			:returns: list of referenced UIDs
217			"""
218			return self._get(object, as_objects=False)
219
220			def _get(self, object, as_objects=False):
221			"""Returns single/multi value
222
223			:param object: instance of the field
224			:param as_objects: Flag for UID/object returns
225			:returns: list of referenced UIDs
226			"""
227			uids = super(UIDReferenceField, self).get(object)
228
229			if not uids:
230			uids = []
231
232			if as_objects is True:
233			uids = filter(None, map(self.get_object, uids))
234
235			if self.multi_valued:
236			return uids
237			if len(uids) == 0:
238			return None
239			return uids[0]
240

senaite / senaite.core

Pull Request — 2.x (#1864)

UIDReferenceField.__init__() A

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UIDReferenceField.init() A