169 lines
5.5 KiB
Python
169 lines
5.5 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, Any
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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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append_object_to_attribute: Dict[str, T] = None,
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extend_object_to_attribute: Dict[str, Collection] = 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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# 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.append_object_to_attribute: Dict[str, T] = append_object_to_attribute or {}
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self.extend_object_to_attribute: Dict[str, Collection[T]] = extend_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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# This is to cleanly unmap previously mapped items by their id
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self._indexed_from_id: Dict[int, Dict[str, Any]] = defaultdict(dict)
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# this is to keep track and look up the actual objects
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self._indexed_values: Dict[str, Dict[Any, T]] = defaultdict(dict)
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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._unmap_element(__object.id)
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self._indexed_from_id[__object.id]["id"] = __object.id
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self._indexed_values["id"][__object.id] = __object
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for name, value in __object.indexing_values:
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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] = __object
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self._indexed_from_id[__object.id][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 not in self._indexed_from_id:
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return
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for name, value in self._indexed_from_id[obj_id].items():
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if value in self._indexed_values[name]:
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del self._indexed_values[name][value]
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del self._indexed_from_id[obj_id]
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def _find_object(self, __object: T) -> Optional[T]:
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for name, value in __object.indexing_values:
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if value in self._indexed_values[name]:
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return self._indexed_values[name][value]
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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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existing_object = self._find_object(__object)
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if existing_object is None:
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# append
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self._data.append(__object)
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self._map_element(__object)
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for collection_attribute, child_collection in self.extend_object_to_attribute.items():
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__object.__getattribute__(collection_attribute).extend(child_collection)
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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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self._unmap_element(old_id)
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self._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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@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)
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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) -> Iterator[T]:
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yield from self._data
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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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return self._data[item]
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def get(self, item: int, default = None):
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if item >= len(self._data):
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return default
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return self._data[item]
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