Source code for tsmakers.HashCachingObject

import abjad


[docs]class HashCachingObject(object):

    ### CLASS VARIABLES ###

    __slots__ = (
        "_format",
        "_hash",
    )

    ### INITIALIZER ###

    def __init__(self):
        self._format = None
        self._hash = None

[docs]    def __str__(self):
        return abjad.storage(self)

[docs]    def __repr__(self):
        return abjad.storage(self)

    ### SPECIAL METHODS ###

    # @profile
[docs]    def __eq__(self, expr):
        if isinstance(expr, type(self)):
            if format(self) == format(expr):
                return True
        return False

    # @profile
[docs]    def __format__(self, format_specification=""):
        if self._format is None:
            agent = abjad.StorageFormatManager(self)
            self._format = agent.get_storage_format()
        return self._format

    # @profile
[docs]    def __hash__(self):
        if self._hash is None:
            self._hash = hash((type(self), format(self)))
        return self._hash