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Branch.dotted_revno_to_revision_id API

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bzrlib/branch.py
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        raise NotImplementedError(self.get_physical_lock_status)
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    @needs_read_lock
 
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    def dotted_revno_to_revision_id(self, revno):
 
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        """Return the revision_id for a dotted revno.
 
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        :param revno: a tuple like (1,) or (1,1,2)
 
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        :return: the revision_id
 
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        :raises errors.NoSuchRevision: if the revno doesn't exist
 
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        """
 
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        return self._dotted_revno_to_revision_id(revno)
 
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    def _dotted_revno_to_revision_id(self, revno):
 
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        """Worker function for dotted_revno_to_revision_id.
 
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        Subclasses should override this if they wish to
 
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        provide a more efficient implementation.
 
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        """
 
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        if len(revno) == 1:
 
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            return self.get_rev_id(revno[0])
 
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        revision_id_to_revno = self.get_revision_id_to_revno_map()
 
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        for revision_id, this_revno in revision_id_to_revno.iteritems():
 
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            if revno == this_revno:
 
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                return revision_id
 
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        else:
 
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            revno_str = '.'.join(map(str, revno))
 
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            raise errors.NoSuchRevision(self, revno_str)
 
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    @needs_read_lock
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    def get_revision_id_to_revno_map(self):
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        """Return the revision_id => dotted revno map.
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