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annotation.py
# sql/annotation.py # Copyright (C) 2005-2021 the SQLAlchemy authors and contributors # <see AUTHORS file> # # This module is part of SQLAlchemy and is released under # the MIT License: http://www.opensource.org/licenses/mit-license.php """The :class:`.Annotated` class and related routines; creates hash-equivalent copies of SQL constructs which contain context-specific markers and associations. """ from . import operators from .. import util class Annotated(object): """clones a ClauseElement and applies an 'annotations' dictionary. Unlike regular clones, this clone also mimics __hash__() and __cmp__() of the original element so that it takes its place in hashed collections. A reference to the original element is maintained, for the important reason of keeping its hash value current. When GC'ed, the hash value may be reused, causing conflicts. .. note:: The rationale for Annotated producing a brand new class, rather than placing the functionality directly within ClauseElement, is **performance**. The __hash__() method is absent on plain ClauseElement which leads to significantly reduced function call overhead, as the use of sets and dictionaries against ClauseElement objects is prevalent, but most are not "annotated". """ def __new__(cls, *args): if not args: # clone constructor return object.__new__(cls) else: element, values = args # pull appropriate subclass from registry of annotated # classes try: cls = annotated_classes[element.__class__] except KeyError: cls = _new_annotation_type(element.__class__, cls) return object.__new__(cls) def __init__(self, element, values): self.__dict__ = element.__dict__.copy() self.__element = element self._annotations = values self._hash = hash(element) def _annotate(self, values): _values = self._annotations.copy() _values.update(values) return self._with_annotations(_values) def _with_annotations(self, values): clone = self.__class__.__new__(self.__class__) clone.__dict__ = self.__dict__.copy() clone._annotations = values return clone def _deannotate(self, values=None, clone=True): if values is None: return self.__element else: _values = self._annotations.copy() for v in values: _values.pop(v, None) return self._with_annotations(_values) def _compiler_dispatch(self, visitor, **kw): return self.__element.__class__._compiler_dispatch(self, visitor, **kw) @property def _constructor(self): return self.__element._constructor def _clone(self): clone = self.__element._clone() if clone is self.__element: # detect immutable, don't change anything return self else: # update the clone with any changes that have occurred # to this object's __dict__. clone.__dict__.update(self.__dict__) return self.__class__(clone, self._annotations) def __reduce__(self): return self.__class__, (self.__element, self._annotations) def __hash__(self): return self._hash def __eq__(self, other): if isinstance(self.__element, operators.ColumnOperators): return self.__element.__class__.__eq__(self, other) else: return hash(other) == hash(self) # hard-generate Annotated subclasses. this technique # is used instead of on-the-fly types (i.e. type.__new__()) # so that the resulting objects are pickleable. annotated_classes = {} def _deep_annotate(element, annotations, exclude=None): """Deep copy the given ClauseElement, annotating each element with the given annotations dictionary. Elements within the exclude collection will be cloned but not annotated. """ def clone(elem): if ( exclude and hasattr(elem, "proxy_set") and elem.proxy_set.intersection(exclude) ): newelem = elem._clone() elif annotations != elem._annotations: newelem = elem._annotate(annotations) else: newelem = elem newelem._copy_internals(clone=clone) return newelem if element is not None: element = clone(element) clone = None # remove gc cycles return element def _deep_deannotate(element, values=None): """Deep copy the given element, removing annotations.""" cloned = util.column_dict() def clone(elem): # if a values dict is given, # the elem must be cloned each time it appears, # as there may be different annotations in source # elements that are remaining. if totally # removing all annotations, can assume the same # slate... if values or elem not in cloned: newelem = elem._deannotate(values=values, clone=True) newelem._copy_internals(clone=clone) if not values: cloned[elem] = newelem return newelem else: return cloned[elem] if element is not None: element = clone(element) clone = None # remove gc cycles return element def _shallow_annotate(element, annotations): """Annotate the given ClauseElement and copy its internals so that internal objects refer to the new annotated object. Basically used to apply a "dont traverse" annotation to a selectable, without digging throughout the whole structure wasting time. """ element = element._annotate(annotations) element._copy_internals() return element def _new_annotation_type(cls, base_cls): if issubclass(cls, Annotated): return cls elif cls in annotated_classes: return annotated_classes[cls] for super_ in cls.__mro__: # check if an Annotated subclass more specific than # the given base_cls is already registered, such # as AnnotatedColumnElement. if super_ in annotated_classes: base_cls = annotated_classes[super_] break annotated_classes[cls] = anno_cls = type( "Annotated%s" % cls.__name__, (base_cls, cls), {} ) globals()["Annotated%s" % cls.__name__] = anno_cls return anno_cls def _prepare_annotations(target_hierarchy, base_cls): stack = [target_hierarchy] while stack: cls = stack.pop() stack.extend(cls.__subclasses__()) _new_annotation_type(cls, base_cls)
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