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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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# XXX: Some consideration of the problems that might occur if there are
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# files whose id differs only in case. That should probably be forbidden.
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from cStringIO import StringIO
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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.store import TransportStore, hash_prefix
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from bzrlib.atomicfile import AtomicFile
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from bzrlib.errors import NoSuchFile, FileExists
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from bzrlib.trace import mutter
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class WeaveStore(TransportStore):
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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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FILE_SUFFIX = '.weave'
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def __init__(self, transport, prefixed=False, precious=False):
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self._transport = transport
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self._prefixed = prefixed
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self._precious = precious
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def filename(self, file_id):
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"""Return the path relative to the transport root."""
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return hash_prefix(file_id) + file_id + WeaveStore.FILE_SUFFIX
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return file_id + WeaveStore.FILE_SUFFIX
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l = len(WeaveStore.FILE_SUFFIX)
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for relpath, st in self._iter_relpaths():
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if relpath.endswith(WeaveStore.FILE_SUFFIX):
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yield os.path.basename(relpath[:-l])
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def __contains__(self, fileid):
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return self._transport.has(self.filename(fileid))
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def _get(self, file_id):
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return self._transport.get(self.filename(file_id))
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def _put(self, file_id, f):
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self._transport.mkdir(hash_prefix(file_id))
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return self._transport.put(self.filename(file_id), f)
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def get_weave(self, file_id, transaction):
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weave = transaction.map.find_weave(file_id)
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mutter("cache hit in %s for %s", self, file_id)
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w = read_weave(self._get(file_id))
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transaction.map.add_weave(file_id, w)
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transaction.register_clean(w, precious=self._precious)
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def get_lines(self, file_id, rev_id, transaction):
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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, transaction)
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return w.get(w.lookup(rev_id))
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def get_weave_or_empty(self, file_id, transaction):
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"""Return a weave, or an empty one if it doesn't exist."""
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return self.get_weave(file_id, transaction)
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weave = Weave(weave_name=file_id)
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transaction.map.add_weave(file_id, weave)
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transaction.register_clean(weave, precious=self._precious)
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def put_weave(self, file_id, weave, transaction):
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"""Write back a modified weave"""
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transaction.register_dirty(weave)
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# TODO FOR WRITE TRANSACTIONS: this should be done in a callback
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# from the transaction, when it decides to save.
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write_weave_v5(weave, sio)
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self._put(file_id, sio)
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def add_text(self, file_id, rev_id, new_lines, parents, transaction):
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w = self.get_weave_or_empty(file_id, transaction)
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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, transaction)
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def add_identical_text(self, file_id, old_rev_id, new_rev_id, parents,
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w = self.get_weave_or_empty(file_id, transaction)
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parent_idxs = map(w.lookup, parents)
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w.add_identical(old_rev_id, new_rev_id, parent_idxs)
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self.put_weave(file_id, w, transaction)
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def copy_multi(self, from_store, file_ids):
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assert isinstance(from_store, WeaveStore)
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mutter("copy weave {%s} into %s", f, self)
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self._put(f, from_store._get(f))
added
removed
bzrlib/store/weave.py
