~bzr-pqm/bzr/bzr.dev

#! /usr/bin/env python

# 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

from bzrlib.xml import ElementTree, SubElement, Element, Serializer

from bzrlib.inventory import ROOT_ID, Inventory, InventoryEntry

from bzrlib.revision import Revision        

from bzrlib.errors import BzrError

class Serializer_v5(Serializer):

    """Version 5 serializer

    Packs objects into XML and vice versa.

    """

    __slots__ = []

    def _pack_inventory(self, inv):

        """Convert to XML Element"""

        e = Element('inventory')

        e.text = '\n'

        if inv.root.file_id not in (None, ROOT_ID):

            e.set('file_id', inv.root.file_id)

        for path, ie in inv.iter_entries():

            e.append(self._pack_entry(ie))

        return e

    def _pack_entry(self, ie):

        """Convert InventoryEntry to XML element"""

        assert ie.kind in ('directory', 'file', 'symlink')

        e = Element(ie.kind)

        e.set('name', ie.name)

        e.set('file_id', ie.file_id)

        if ie.text_size != None:

            e.set('text_size', '%d' % ie.text_size)

        for f in ['text_version', 'text_sha1', 'name_version', 

                  'symlink_target']:

            v = getattr(ie, f)

            if v != None:

                e.set(f, v)

        # to be conservative, we don't externalize the root pointers

        # for now, leaving them as null in the xml form.  in a future

        # version it will be implied by nested elements.

        if ie.parent_id != ROOT_ID:

            assert isinstance(ie.parent_id, basestring)

            e.set('parent_id', ie.parent_id)

        e.tail = '\n'

        return e

    def _pack_revision(self, rev):

        """Revision object -> xml tree"""

        root = Element('revision',

                       committer = rev.committer,

                       timestamp = '%.9f' % rev.timestamp,

                       revision_id = rev.revision_id,

                       inventory_sha1 = rev.inventory_sha1,

                       )

        if rev.timezone:

            root.set('timezone', str(rev.timezone))

        root.text = '\n'

        msg = SubElement(root, 'message')

        msg.text = rev.message

        msg.tail = '\n'

        if rev.parent_ids:

            pelts = SubElement(root, 'parents')

            pelts.tail = pelts.text = '\n'

            for parent_id in rev.parent_ids:

                assert isinstance(parent_id, basestring)

                p = SubElement(pelts, 'revision_ref')

                p.tail = '\n'

                p.set('revision_id', parent_id)

        return root

    def _unpack_inventory(self, elt):

        """Construct from XML Element

        """

        assert elt.tag == 'inventory'

        root_id = elt.get('file_id') or ROOT_ID

        inv = Inventory(root_id)

        for e in elt:

            ie = self._unpack_entry(e)

            if ie.parent_id == ROOT_ID:

                ie.parent_id = root_id

            inv.add(ie)

        return inv

    def _unpack_entry(self, elt):

        kind = elt.tag

        if not kind in ('directory', 'file', 'symlink'):

            raise AssertionError('unsupported entry kind %s' % kind)

        parent_id = elt.get('parent_id')

        if parent_id == None:

            parent_id = ROOT_ID

        ie = InventoryEntry(elt.get('file_id'),

                            elt.get('name'),

                            kind,

                            parent_id)

        ie.text_version = elt.get('text_version')

        ie.name_version = elt.get('name_version')

        ie.text_sha1 = elt.get('text_sha1')

        ie.symlink_target = elt.get('symlink_target')

        v = elt.get('text_size')

        ie.text_size = v and int(v)

        return ie

    def _unpack_revision(self, elt):

        """XML Element -> Revision object"""

        assert elt.tag == 'revision'

        rev = Revision(committer = elt.get('committer'),

                       timestamp = float(elt.get('timestamp')),

                       revision_id = elt.get('revision_id'),

                       inventory_sha1 = elt.get('inventory_sha1')

                       )

        parents = elt.find('parents') or []

        for p in parents:

            assert p.tag == 'revision_ref', \

                   "bad parent node tag %r" % p.tag

            rev.parent_ids.append(p.get('revision_id'))

        v = elt.get('timezone')

        rev.timezone = v and int(v)

        rev.message = elt.findtext('message') # text of <message>

        return rev

serializer_v5 = Serializer_v5()