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Copy pathoperation.py
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Copy pathoperation.py
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299 lines (242 loc) · 8.7 KB
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# coding: utf-8
import copy
import leancloud
import leancloud.utils
__author__ = 'asaka <lan@leancloud.rocks>'
class BaseOp(object):
def dump(self):
raise NotImplementedError
def _merge(self, previous):
raise NotImplementedError
def _apply(self, old, obj=None, key=None):
raise NotImplementedError
_UNSET = BaseOp()
class Set(BaseOp):
def __init__(self, value):
self._value = value
@property
def value(self):
return self._value
def dump(self):
return leancloud.utils.encode(self.value)
def _merge(self, previous):
return self
def _apply(self, old, obj=None, key=None):
return self.value
class Unset(BaseOp):
def __init__(self):
pass
def dump(self):
return {
'__op': 'Delete'
}
def _merge(self, previous):
return self
def _apply(self, old, obj=None, key=None):
return _UNSET
class Increment(BaseOp):
def __init__(self, amount=1):
self._amount = amount
@property
def amount(self):
return self._amount
def dump(self):
return {
'__op': 'Increment',
'amount': self.amount,
}
def _merge(self, previous):
if not previous:
return self
elif isinstance(previous, Unset):
return Set(self.amount)
elif isinstance(previous, Set):
return Set(previous.value + self.amount)
elif isinstance(previous, Increment):
return Increment(self.amount + previous.amount)
raise TypeError('invalid op')
def _apply(self, old, obj=None, key=None):
if not old:
return self.amount
return old + self.amount
class Add(BaseOp):
def __init__(self, objects):
if not isinstance(objects, (list, tuple)):
raise TypeError('Add op requires list or tuple as parameters')
self._objects = objects
@property
def objects(self):
return self._objects
def dump(self):
return {
'__op': 'Add',
'objects': leancloud.utils.encode(self.objects),
}
def _merge(self, previous):
if not previous:
return self
elif isinstance(previous, Unset):
return Set(self.objects)
elif isinstance(previous, Set):
return Set(self._apply(previous.value))
elif isinstance(previous, Add):
return Add(previous.objects + self.objects)
raise TypeError('invalid op')
def _apply(self, old, obj=None, key=None):
if not old:
return self.objects
return old + self.objects
class AddUnique(BaseOp):
def __init__(self, objects):
if not isinstance(objects, (list, tuple)):
raise TypeError('op.AddUnique requires list or tuple as parameters')
self._objects = list(set(objects))
@property
def objects(self):
return self._objects
def dump(self):
return {
'__op': 'AddUnique',
'objects': leancloud.utils.encode(self.objects),
}
def _merge(self, previous):
if not previous:
return self
elif isinstance(previous, Unset):
return Set(self.objects)
elif isinstance(previous, Set):
return Set(self._apply(previous.value))
elif isinstance(previous, AddUnique):
return AddUnique(self._apply(previous.objects))
raise TypeError('invalid op')
def _apply(self, old, obj=None, key=None):
if not old:
return copy.deepcopy(self.objects)
new = copy.deepcopy(old)
# TODO: more readable
for obj in self.objects:
if isinstance(obj, leancloud.Object) and obj.id is not None:
for index, another_obj in enumerate(new):
if another_obj.id == obj.id:
new[index] = obj
continue
else:
new.append(obj)
elif obj not in new:
new.append(obj)
return new
class Remove(BaseOp):
def __init__(self, objects):
if not isinstance(objects, (list, tuple)):
raise TypeError('op.Remove requires list or tuple as parameters')
self._objects = list(set(objects))
@property
def objects(self):
return self._objects
def dump(self):
return {
'__op': 'Remove',
'objects': leancloud.utils.encode(self.objects)
}
def _merge(self, previous):
if not previous:
return self
elif isinstance(previous, Unset):
return previous
elif isinstance(previous, Set):
return Set(self._apply(previous.value))
elif isinstance(previous, Remove):
return Remove(list(set(self.objects + previous.objects)))
raise TypeError('invalid op')
def _apply(self, old, obj=None, key=None):
if not old:
return []
new = list(set(old) - set(self.objects))
for obj in self.objects:
if isinstance(obj, leancloud.Object) and obj.id:
new = [x for x in new if not (isinstance(x, leancloud.Object) and x.id == obj.id)]
return new
class Relation(BaseOp):
def __init__(self, adds, removes):
self._target_class_name = None
self.relations_to_add = set([self._pointer_to_id(x) for x in adds])
self.relations_to_remove = set([self._pointer_to_id(x) for x in removes])
def _pointer_to_id(self, obj):
if isinstance(obj, leancloud.Object):
if obj.id is None:
raise TypeError('cant add an unsaved Object to a relation')
if self._target_class_name is None:
self._target_class_name = obj._class_name
if self._target_class_name != obj._class_name:
raise TypeError('try to create a Relation with 2 different types')
return obj.id
return obj
@property
def added(self):
objs = []
for obj_id in self.relations_to_add:
obj = leancloud.Object.create(self._target_class_name)
obj.id = obj_id
objs.append(obj)
return objs
@property
def removed(self):
objs = []
for obj_id in self.relations_to_remove:
obj = leancloud.Object.create(self._target_class_name)
obj.id = obj_id
objs.append(obj)
return objs
def dump(self):
adds = None
removes = None
def id_to_pointer(id_):
return {
'__type': 'Pointer',
'className': self._target_class_name,
'objectId': id_,
}
if len(self.relations_to_add) > 0:
adds = {
'__op': 'AddRelation',
'objects': [id_to_pointer(x) for x in self.relations_to_add]
}
if len(self.relations_to_remove) > 0:
removes = {
'__op': 'RemoveRelation',
'objects': [id_to_pointer(x) for x in self.relations_to_remove]
}
if adds and removes:
return {
'__op': 'Batch',
'ops': [adds, removes]
}
return adds or removes or {}
def _merge(self, previous=None):
if previous is None:
return self
elif isinstance(previous, Unset):
raise ValueError('can\'t modify a relation after deleting it.')
elif isinstance(previous, Relation):
if (previous._target_class_name) and (previous._target_class_name != self._target_class_name):
raise TypeError('related object must be class of {0}'.format(previous._target_class_name))
new_add = (previous.relations_to_add - self.relations_to_remove) | self.relations_to_add
new_remove = (previous.relations_to_remove - self.relations_to_add) | self.relations_to_remove
new_relation = Relation(new_add, new_remove)
new_relation._target_class_name = self._target_class_name
return new_relation
else:
raise TypeError('invalid op')
def _apply(self, old, obj=None, key=None):
if obj is None:
relation = leancloud.Relation(obj, key)
elif isinstance(old, leancloud.Relation):
if self._target_class_name:
if old.target_class_name:
if old.target_class_name != self._target_class_name:
raise TypeError('related object must be class of {0}'.format(old.target_class_name))
else:
old.target_class_name = self._target_class_name
return old
else:
raise TypeError('invalid op')