~bzr-pqm/bzr/bzr.dev

#! /usr/bin/python

# Copyright (C) 2005 Canonical Ltd

# This program is free software; you can redistribute it and/or modify

# it under the terms of the GNU General Public License as published by

# the Free Software Foundation; either version 2 of the License, or

# (at your option) any later version.

# This program is distributed in the hope that it will be useful,

# but WITHOUT ANY WARRANTY; without even the implied warranty of

# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the

# GNU General Public License for more details.

# You should have received a copy of the GNU General Public License

# along with this program; if not, write to the Free Software

# Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA

# Author: Martin Pool <mbp@canonical.com>

import os

from bzrlib.weavefile import read_weave, write_weave_v5

from bzrlib.weave import Weave

from bzrlib.atomicfile import AtomicFile

class WeaveStore(object):

    """Collection of several weave files."""

    def __init__(self, dir):

        self._dir = dir

    def filename(self, file_id):

        return self._dir + os.sep + file_id + '.weave'

    def get_weave(self, file_id):

        return read_weave(file(self.filename(file_id), 'rb'))

    def put_weave(self, file_id, weave):

        """Write back a modified weave"""

        weave_fn = self.filename(file_id)

        af = AtomicFile(weave_fn)

        try:

            write_weave_v5(weave, af)

            af.commit()

        finally:

            af.close()

    def add_text(self, file_id, rev_id, new_lines, parents):

        weave_fn = self.filename(file_id)

        if os.path.exists(weave_fn):

            w = read_weave(file(weave_fn, 'rb'))

        else:

            w = Weave()

        parent_idxs = map(w.lookup, parents)

        w.add(rev_id, parent_idxs, new_lines)

        self.put_weave(file_id, w)