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  • Committer: Lukáš Lalinský
  • Date: 2007-12-03 20:48:08 UTC
  • mto: (3298.2.1 get_rev_id)
  • mto: This revision was merged to the branch mainline in revision 3328.
  • Revision ID: lalinsky@gmail.com-20071203204808-gv1m751xdb8m9ltc
Make RevisionSpec_last not load the whole history.

Implement BzrBranch6.get_rev_id, that uses last_revision_info and repository.iter_reverse_revision_history to find out the revision_id incrementally without loading the whole history.

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Lines of Context:
bzrlib/branch.py
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    def _make_tags(self):
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        return BasicTags(self)
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    def get_rev_id(self, revno, history=None):
 
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        """Find the revision id of the specified revno."""
 
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        if revno == 0:
 
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            return _mod_revision.NULL_REVISION
 
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        last_revno, last_revision_id = self.last_revision_info()
 
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        if revno == last_revno:
 
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            return last_revision_id
 
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        if revno <= 0 or revno > last_revno:
 
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            raise errors.NoSuchRevision(self, revno)
 
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        if history is None:
 
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            history = self._revision_history_cache
 
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        if history is not None:
 
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            return history[revno - 1]
 
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        # TODO cache the partially loaded history (Lukas Lalinsky, 20081203)
 
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        revision_id = last_revision_id
 
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        history_iter = self.repository.iter_reverse_revision_history(
 
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            last_revision_id)
 
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        for i in xrange(last_revno - revno + 1):
 
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            try:
 
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                revision_id = history_iter.next()
 
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            except StopIteration:
 
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                raise errors.NoSuchRevision(self, revno)
 
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        return revision_id
 
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######################################################################
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# results of operations