310 lines
9.9 KiB
Python
310 lines
9.9 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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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._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 _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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def _contained_in_self(self, __object: T) -> bool:
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if __object.id in self._contains_ids:
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return True
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for name, value in __object.indexing_values:
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if value is None:
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continue
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if value == self._indexed_values[name]:
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return True
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return False
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def _contained_in_sub(self, __object: T, break_at_first: bool = True) -> List[Collection]:
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"""
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Gets the collection this object is found in, if it is found in any.
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:param __object:
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:param break_at_first:
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:return:
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"""
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results = []
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if self._contained_in_self(__object):
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return [self]
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for collection in self.children:
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results.extend(collection._contained_in_sub(__object, break_at_first=break_at_first))
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if break_at_first:
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return results
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return results
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def _get_root_collections(self) -> List[Collection]:
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if not len(self.parents):
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return [self]
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root_collections = []
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for upper_collection in self.parents:
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root_collections.extend(upper_collection._get_root_collections())
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return root_collections
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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 _get_parents_of_multiple_contained_children(self, __object: T):
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results = []
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if len(self.children) < 2 or self._contained_in_self(__object):
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return results
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count = 0
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for collection in self.children:
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sub_results = collection._get_parents_of_multiple_contained_children(__object)
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if len(sub_results) > 0:
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count += 1
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results.extend(sub_results)
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if count >= 2:
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results.append(self)
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return results
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def merge_into_self(self, __object: T, from_map: bool = False):
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"""
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1. find existing objects
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2. merge into existing object
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3. remap existing object
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"""
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if __object.id in self._contains_ids:
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return
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existing_object: T = None
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for name, value in __object.indexing_values:
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if value is None:
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continue
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if value == self._indexed_values[name]:
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existing_object = self._indexed_to_objects[value]
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if existing_object.id == __object.id:
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return None
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break
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if existing_object is None:
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return None
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existing_object.merge(__object)
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# just a check if it really worked
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if existing_object.id != __object.id:
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raise ValueError("This should NEVER happen. Merging doesn't work.")
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self._map_element(existing_object, from_map=from_map)
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def contains(self, __object: T) -> bool:
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return len(self._contained_in_sub(__object)) > 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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# only modify collections if the object actually has been appended
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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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for attribute, collection in self.sync_on_append.items():
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collection.extend(__object.__getattribute__(attribute))
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__object.__setattr__(attribute, collection)
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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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