209 lines
7.1 KiB
Python
209 lines
7.1 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, Set
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from .parents import OuterProxy
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from ..utils import object_trace
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from ..utils import output, BColors
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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_from_id: Dict[int, Dict[str, Any]]
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_indexed_values: Dict[str, Dict[Any, T]]
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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.pull_from: List[Collection] = []
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self.push_to: List[Collection] = []
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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({' | '.join(self._collection_for.values())} {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 _remap(self):
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for e in self:
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self._map_element(e)
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def _find_object(self, __object: T, no_push_to: bool = False) -> Optional[T]:
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if not no_push_to or True:
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for c in self.push_to:
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found, found_in = c._find_object(__object, no_push_to=True)
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if found is not None:
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output("push to", found, __object, color=BColors.RED)
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return found, found_in
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self._remap()
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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], self
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return None, self
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def append(self, __object: Optional[T], **kwargs):
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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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:return:
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"""
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if __object is None:
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return
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object_trace(f"Appending {__object.option_string} {__object.id} to {self}")
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existing_object, map_to = self._find_object(__object, no_push_to=kwargs.get("no_push_to", False))
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if map_to is self:
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for other, contained in (c._find_object(__object, no_push_to=True) for c in self.pull_from):
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if other is None:
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continue
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output("pull from", other, __object, color=BColors.RED)
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__object.__merge__(other, no_push_to=False, **kwargs)
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contained.remove(other)
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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, **kwargs)
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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, **kwargs)
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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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if a is b:
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continue
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no_sync_collection: Set[Collection] = kwargs.get("no_sync_collection", set())
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object_trace(f"Syncing [{a}] = [{b}]; {no_sync_collection}")
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if id(b) in no_sync_collection:
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continue
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b_data = b.data.copy()
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b_collection_for = b._collection_for.copy()
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no_sync_collection.add(id(b))
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# kwargs["no_sync_collection"] = no_sync_collection
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del b
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a.extend(b_data, **kwargs)
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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._collection_for[synced_with] = key
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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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existing_object.merge(__object, **kwargs)
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map_to._map_element(existing_object)
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def remove(self, __object: T) -> T:
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self._data.remove(__object)
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self._unmap_element(__object)
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return __object
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def contains(self, __object: T) -> bool:
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return self._find_object(__object) is not None
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def extend(self, __iterable: Optional[Generator[T, None, None]], **kwargs):
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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, **kwargs)
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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, **kwargs):
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self.extend(__other, **kwargs)
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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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