Lars Noack
fa723d7747
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229 lines
7.5 KiB
Python
229 lines
7.5 KiB
Python
from __future__ import annotations
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from collections import defaultdict
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from typing import TypeVar, Generic, Dict, Optional, Iterable, List, Iterator, Tuple, Generator, Union
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from .parents import OuterProxy
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from ..utils import object_trace
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T = TypeVar('T', bound=OuterProxy)
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class Collection(Generic[T]):
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__is_collection__ = True
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_data: List[T]
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_indexed_values: Dict[str, set]
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_indexed_to_objects: Dict[any, list]
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shallow_list = property(fget=lambda self: self.data)
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def __init__(
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self,
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data: Optional[Iterable[T]] = None,
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sync_on_append: Dict[str, Collection] = None,
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contain_given_in_attribute: Dict[str, Collection] = None,
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contain_attribute_in_given: Dict[str, Collection] = None,
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append_object_to_attribute: Dict[str, T] = None
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) -> None:
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self._collection_for: dict = dict()
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self._contains_ids = set()
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self._data = []
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self.parents: List[Collection[T]] = []
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self.children: List[Collection[T]] = []
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# List of collection attributes that should be modified on append
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# Key: collection attribute (str) of appended element
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# Value: main collection to sync to
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self.contain_given_in_attribute: Dict[str, Collection] = contain_given_in_attribute or {}
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self.append_object_to_attribute: Dict[str, T] = append_object_to_attribute or {}
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self.sync_on_append: Dict[str, Collection] = sync_on_append or {}
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self._id_to_index_values: Dict[int, set] = defaultdict(set)
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self._indexed_values = defaultdict(lambda: None)
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self._indexed_to_objects = defaultdict(lambda: None)
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self.extend(data)
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def __repr__(self) -> str:
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return f"Collection({id(self)})"
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def _map_element(self, __object: T, from_map: bool = False):
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self._contains_ids.add(__object.id)
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for name, value in (*__object.indexing_values, ('id', __object.id)):
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if value is None or value == __object._inner._default_values.get(name):
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continue
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self._indexed_values[name] = value
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self._indexed_to_objects[value] = __object
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self._id_to_index_values[__object.id].add((name, value))
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def _unmap_element(self, __object: Union[T, int]):
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obj_id = __object.id if isinstance(__object, OuterProxy) else __object
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if obj_id in self._contains_ids:
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self._contains_ids.remove(obj_id)
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for name, value in self._id_to_index_values[obj_id]:
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if name in self._indexed_values:
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del self._indexed_values[name]
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if value in self._indexed_to_objects:
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del self._indexed_to_objects[value]
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del self._id_to_index_values[obj_id]
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@property
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def is_root(self) -> bool:
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return len(self.parents) <= 0
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def _find_object_in_self(self, __object: T) -> Optional[T]:
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for name, value in __object.indexing_values:
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if value == self._indexed_values[name]:
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return self._indexed_to_objects[value]
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def _find_object(self, __object: T, no_sibling: bool = False) -> Tuple[Collection[T], Optional[T]]:
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other_object = self._find_object_in_self(__object)
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if other_object is not None:
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return self, other_object
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for c in self.children:
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o, other_object = c._find_object(__object)
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if other_object is not None:
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return o, other_object
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if no_sibling:
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return self, None
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"""
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# find in siblings and all children of siblings
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for parent in self.parents:
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for sibling in parent.children:
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if sibling is self:
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continue
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o, other_object = sibling._find_object(__object, no_sibling=True)
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if other_object is not None:
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return o, other_object
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"""
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return self, None
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def append(self, __object: Optional[T], already_is_parent: bool = False, from_map: bool = False):
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"""
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If an object, that represents the same entity exists in a relevant collection,
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merge into this object. (and remap)
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Else append to this collection.
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:param __object:
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:param already_is_parent:
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:param from_map:
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:return:
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"""
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if __object is None:
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return
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append_to, existing_object = self._find_object(__object)
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if existing_object is None:
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# append
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append_to._data.append(__object)
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append_to._map_element(__object)
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for collection_attribute, child_collection in self.contain_given_in_attribute.items():
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__object.__getattribute__(collection_attribute).contain_collection_inside(child_collection, __object)
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for attribute, new_object in self.append_object_to_attribute.items():
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__object.__getattribute__(attribute).append(new_object)
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# only modify collections if the object actually has been appended
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for attribute, a in self.sync_on_append.items():
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b = __object.__getattribute__(attribute)
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object_trace(f"Syncing [{a}{id(a)}] = [{b}{id(b)}]")
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data_to_extend = b.data
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a._collection_for.update(b._collection_for)
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for synced_with, key in b._collection_for.items():
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synced_with.__setattr__(key, a)
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a.extend(data_to_extend)
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else:
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# merge only if the two objects are not the same
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if existing_object.id == __object.id:
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return
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old_id = existing_object.id
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existing_object.merge(__object)
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if existing_object.id != old_id:
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append_to._unmap_element(old_id)
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append_to._map_element(existing_object)
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def extend(self, __iterable: Optional[Generator[T, None, None]]):
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if __iterable is None:
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return
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for __object in __iterable:
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self.append(__object)
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def contain_collection_inside(self, sub_collection: Collection, _object: T):
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"""
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This collection will ALWAYS contain everything from the passed in collection
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"""
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if self is sub_collection or sub_collection in self.children:
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return
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_object._inner._is_collection_child[self] = sub_collection
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_object._inner._is_collection_parent[sub_collection] = self
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self.children.append(sub_collection)
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sub_collection.parents.append(self)
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@property
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def data(self) -> List[T]:
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return list(self.__iter__())
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def __len__(self) -> int:
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return len(self._data) + sum(len(collection) for collection in self.children)
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@property
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def empty(self) -> bool:
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return self.__len__() <= 0
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def __iter__(self, finished_ids: set = None) -> Iterator[T]:
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_finished_ids = finished_ids or set()
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for element in self._data:
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if element.id in _finished_ids:
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continue
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_finished_ids.add(element.id)
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yield element
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for c in self.children:
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yield from c.__iter__(finished_ids=finished_ids)
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def __merge__(self, __other: Collection, override: bool = False):
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self.extend(__other)
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def __getitem__(self, item: int):
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if item < len(self._data):
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return self._data[item]
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item = item - len(self._data)
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for c in self.children:
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if item < len(c):
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return c.__getitem__(item)
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item = item - len(c._data)
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raise IndexError
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