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  • Committer: Jelmer Vernooij
  • Date: 2017-05-24 01:39:33 UTC
  • mfrom: (3815.3776.6)
  • Revision ID: jelmer@jelmer.uk-20170524013933-ir4y4tqtrsiz2ka2
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# Copyright (C) 2009 Canonical Ltd
 
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#
 
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# This program is free software; you can redistribute it and/or modify
 
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# it under the terms of the GNU General Public License as published by
 
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# the Free Software Foundation; either version 2 of the License, or
 
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# (at your option) any later version.
 
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#
 
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# This program is distributed in the hope that it will be useful,
 
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# but WITHOUT ANY WARRANTY; without even the implied warranty of
 
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# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 
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# GNU General Public License for more details.
 
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#
 
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# You should have received a copy of the GNU General Public License
 
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# along with this program.  If not, see <http://www.gnu.org/licenses/>.
 
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"""Tracker of refs."""
 
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from __future__ import absolute_import
 
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class RefTracker(object):
 
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    def __init__(self):
 
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        # Head tracking: last ref, last id per ref & map of commit ids to ref*s*
 
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        self.last_ref = None
 
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        self.last_ids = {}
 
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        self.heads = {}
 
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    def dump_stats(self, note):
 
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        self._show_stats_for(self.last_ids, "last-ids", note=note)
 
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        self._show_stats_for(self.heads, "heads", note=note)
 
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    def clear(self):
 
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        self.last_ids.clear()
 
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        self.heads.clear()
 
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    def track_heads(self, cmd):
 
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        """Track the repository heads given a CommitCommand.
 
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        :param cmd: the CommitCommand
 
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        :return: the list of parents in terms of commit-ids
 
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        """
 
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        # Get the true set of parents
 
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        if cmd.from_ is not None:
 
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            parents = [cmd.from_]
 
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        else:
 
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            last_id = self.last_ids.get(cmd.ref)
 
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            if last_id is not None:
 
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                parents = [last_id]
 
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            else:
 
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                parents = []
 
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        parents.extend(cmd.merges)
 
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        # Track the heads
 
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        self.track_heads_for_ref(cmd.ref, cmd.id, parents)
 
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        return parents
 
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    def track_heads_for_ref(self, cmd_ref, cmd_id, parents=None):
 
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        if parents is not None:
 
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            for parent in parents:
 
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                if parent in self.heads:
 
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                    del self.heads[parent]
 
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        self.heads.setdefault(cmd_id, set()).add(cmd_ref)
 
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        self.last_ids[cmd_ref] = cmd_id
 
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        self.last_ref = cmd_ref
 
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