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bzrlib/inter.py
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"""Inter-object utility class."""
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from bzrlib.errors import NoCompatibleInter
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class InterObject(object):
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    """This class represents operations taking place between two objects.
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                       the InterObject instance.
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        :param target: the object to be the 'target' member of
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                       the InterObject instance.
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        If an optimised worker exists it will be used otherwise
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        a default Inter worker instance will be created.
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        """
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        for provider in reversed(klass._optimisers):
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            if provider.is_compatible(source, target):
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                return provider(source, target)
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        raise NoCompatibleInter(source, target)
 
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        return klass(source, target)
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    def lock_read(self):
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        """Take out a logical read lock.