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# Copyright (C) 2006-2010 Canonical Ltd
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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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# 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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# You should have received a copy of the GNU General Public License
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# along with this program; if not, write to the Free Software
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# Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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"""RevisionTree - a Tree implementation backed by repository data for a revision."""
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from io import BytesIO
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class RevisionTree(tree.Tree):
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"""Tree viewing a previous revision.
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File text can be retrieved from the text store.
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def __init__(self, repository, revision_id):
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self._repository = repository
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self._revision_id = revision_id
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self._rules_searcher = None
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def has_versioned_directories(self):
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"""See `Tree.has_versioned_directories`."""
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return self._repository._format.supports_versioned_directories
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def supports_tree_reference(self):
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return getattr(self._repository._format, "supports_tree_reference",
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def get_parent_ids(self):
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"""See Tree.get_parent_ids.
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A RevisionTree's parents match the revision graph.
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if self._revision_id in (None, revision.NULL_REVISION):
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parent_ids = self._repository.get_revision(
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self._revision_id).parent_ids
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def get_revision_id(self):
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"""Return the revision id associated with this tree."""
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return self._revision_id
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def get_file_revision(self, path):
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"""Return the revision id in which a file was last changed."""
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raise NotImplementedError(self.get_file_revision)
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def get_file_text(self, path):
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for (identifier, content) in self.iter_files_bytes([(path, None)]):
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ret = b"".join(content)
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def get_file(self, path):
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return BytesIO(self.get_file_text(path))
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return self._repository.is_locked()
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self._repository.lock_read()
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return lock.LogicalLockResult(self.unlock)
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return '<%s instance at %x, rev_id=%r>' % (
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self.__class__.__name__, id(self), self._revision_id)
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self._repository.unlock()
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def _get_rules_searcher(self, default_searcher):
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"""See Tree._get_rules_searcher."""
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if self._rules_searcher is None:
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self._rules_searcher = super(RevisionTree,
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self)._get_rules_searcher(default_searcher)
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return self._rules_searcher