Current File : //proc/self/root/opt/alt/python27/lib64/python2.7/site-packages/sqlalchemy/sql/annotation.pyc
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s� The :class:`.Annotated` class and related routines; creates hash-equivalent
copies of SQL constructs which contain context-specific markers and
associations.
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sE 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".
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with the given annotations dictionary.
Elements within the exclude collection will be cloned but not annotated.
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c C s | j | � } | j � | S( s 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.
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