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# Copyright (C) 2005 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., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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# Author: Martin Pool <mbp@canonical.com>
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from bzrlib.weavefile import read_weave, write_weave_v5
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from bzrlib.weave import Weave
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from bzrlib.atomicfile import AtomicFile
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class WeaveStore(object):
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"""Collection of several weave files in a directory.
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This has some shortcuts for reading and writing them.
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def __init__(self, dir):
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self.enable_cache = False
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def filename(self, file_id):
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return self._dir + os.sep + file_id + '.weave'
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def get_weave(self, file_id):
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if file_id in self._cache:
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return self._cache[file_id]
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w = read_weave(file(self.filename(file_id), 'rb'))
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self._cache[file_id] = w
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def get_lines(self, file_id, rev_id):
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"""Return text from a particular version of a weave.
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Returned as a list of lines."""
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w = self.get_weave(file_id)
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return w.get(w.lookup(rev_id))
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def get_weave_or_empty(self, file_id):
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"""Return a weave, or an empty one if it doesn't exist."""
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inf = file(self.filename(file_id), 'rb')
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if e.errno == errno.ENOENT:
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return Weave(weave_name=file_id)
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return read_weave(inf)
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def put_weave(self, file_id, weave):
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"""Write back a modified weave"""
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self._cache[file_id] = weave
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weave_fn = self.filename(file_id)
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af = AtomicFile(weave_fn)
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write_weave_v5(weave, af)
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def add_text(self, file_id, rev_id, new_lines, parents):
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w = self.get_weave_or_empty(file_id)
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parent_idxs = map(w.lookup, parents)
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w.add(rev_id, parent_idxs, new_lines)
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self.put_weave(file_id, w)