~bzr-pqm/bzr/bzr.dev

# 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

"""RevisionTree - a Tree implementation backed by repository data for a revision."""

from cStringIO import StringIO

from bzrlib.tree import Tree

class RevisionTree(Tree):

    """Tree viewing a previous revision.

    File text can be retrieved from the text store.

    TODO: Some kind of `__repr__` method, but a good one

           probably means knowing the branch and revision number,

           or at least passing a description to the constructor.

    """

    def __init__(self, branch, inv, revision_id):

        # for compatability the 'branch' parameter has not been renamed to 

        # repository at this point. However, we should change RevisionTree's

        # construction to always be via Repository and not via direct 

        # construction - this will mean that we can change the constructor

        # with much less chance of breaking client code.

        self._repository = branch

        self._weave_store = branch.weave_store

        self._inventory = inv

        self._revision_id = revision_id

    def get_parent_ids(self):

        """See Tree.get_parent_ids.

        A RevisionTree's parents match the revision graph.

        """

        parent_ids = self._repository.get_revision(self._revision_id).parent_ids

        return parent_ids

    def get_revision_id(self):

        """Return the revision id associated with this tree."""

        return self._revision_id

    def get_weave(self, file_id):

        return self._weave_store.get_weave(file_id,

                self._repository.get_transaction())

    def get_file_lines(self, file_id):

        ie = self._inventory[file_id]

        weave = self.get_weave(file_id)

        return weave.get_lines(ie.revision)

    def get_file_text(self, file_id):

        return ''.join(self.get_file_lines(file_id))

    def get_file(self, file_id):

        return StringIO(self.get_file_text(file_id))

    def get_file_size(self, file_id):

        return self._inventory[file_id].text_size

    def get_file_sha1(self, file_id, path=None):

        ie = self._inventory[file_id]

        if ie.kind == "file":

            return ie.text_sha1

        return None

    def get_file_mtime(self, file_id, path=None):

        ie = self._inventory[file_id]

        revision = self._repository.get_revision(ie.revision)

        return revision.timestamp

    def is_executable(self, file_id, path=None):

        ie = self._inventory[file_id]

        if ie.kind != "file":

            return None 

        return self._inventory[file_id].executable

    def has_filename(self, filename):

        return bool(self.inventory.path2id(filename))

    def list_files(self):

        # The only files returned by this are those from the version

        entries = self.inventory.iter_entries()

        # skip the root for compatability with the current apis.

        entries.next()

        for path, entry in entries:

            yield path, 'V', entry.kind, entry.file_id, entry

    def get_symlink_target(self, file_id):

        ie = self._inventory[file_id]

        return ie.symlink_target;

    def kind(self, file_id):

        return self._inventory[file_id].kind

    def lock_read(self):

        self._repository.lock_read()

    def unlock(self):

        self._repository.unlock()