1
# Copyright (C) 2005, 2006, 2009 Canonical Ltd
3
# This program is free software; you can redistribute it and/or modify
4
# it under the terms of the GNU General Public License as published by
5
# the Free Software Foundation; either version 2 of the License, or
6
# (at your option) any later version.
8
# This program is distributed in the hope that it will be useful,
9
# but WITHOUT ANY WARRANTY; without even the implied warranty of
10
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
11
# GNU General Public License for more details.
13
# You should have received a copy of the GNU General Public License
14
# along with this program; if not, write to the Free Software
15
# Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
18
"""Inventory/revision serialization."""
21
from bzrlib import registry
24
class Serializer(object):
25
"""Inventory and revision serialization/deserialization."""
27
squashes_xml_invalid_characters = False
29
def write_inventory(self, inv, f):
30
"""Write inventory to a file.
32
Note: this is a *whole inventory* operation, and should only be used
33
sparingly, as it does not scale well with large trees.
35
raise NotImplementedError(self.write_inventory)
37
def write_inventory_to_string(self, inv):
38
"""Produce a simple string representation of an inventory.
40
Note: this is a *whole inventory* operation, and should only be used
41
sparingly, as it does not scale well with large trees.
43
The requirement for the contents of the string is that it can be passed
44
to read_inventory_from_string and the result is an identical inventory
47
(All serializers as of 2009-07-29 produce XML, but this is not mandated
50
raise NotImplementedError(self.write_inventory_to_string)
52
def read_inventory_from_string(self, string, revision_id=None,
53
entry_cache=None, return_from_cache=False):
54
"""Read string into an inventory object.
56
:param string: The serialized inventory to read.
57
:param revision_id: If not-None, the expected revision id of the
58
inventory. Some serialisers use this to set the results' root
59
revision. This should be supplied for deserialising all
60
from-repository inventories so that xml5 inventories that were
61
serialised without a revision identifier can be given the right
62
revision id (but not for working tree inventories where users can
63
edit the data without triggering checksum errors or anything).
64
:param entry_cache: An optional cache of InventoryEntry objects. If
65
supplied we will look up entries via (file_id, revision_id) which
66
should map to a valid InventoryEntry (File/Directory/etc) object.
67
:param return_from_cache: Return entries directly from the cache,
68
rather than copying them first. This is only safe if the caller
69
promises not to mutate the returned inventory entries, but it can
70
make some operations significantly faster.
72
raise NotImplementedError(self.read_inventory_from_string)
74
def read_inventory(self, f, revision_id=None):
75
"""See read_inventory_from_string."""
76
raise NotImplementedError(self.read_inventory)
78
def write_revision(self, rev, f):
79
raise NotImplementedError(self.write_revision)
81
def write_revision_to_string(self, rev):
82
raise NotImplementedError(self.write_revision_to_string)
84
def read_revision(self, f):
85
raise NotImplementedError(self.read_revision)
87
def read_revision_from_string(self, xml_string):
88
raise NotImplementedError(self.read_revision_from_string)
91
class SerializerRegistry(registry.Registry):
92
"""Registry for serializer objects"""
95
format_registry = SerializerRegistry()
96
format_registry.register_lazy('4', 'bzrlib.xml4', 'serializer_v4')
97
format_registry.register_lazy('5', 'bzrlib.xml5', 'serializer_v5')
98
format_registry.register_lazy('6', 'bzrlib.xml6', 'serializer_v6')
99
format_registry.register_lazy('7', 'bzrlib.xml7', 'serializer_v7')
100
format_registry.register_lazy('8', 'bzrlib.xml8', 'serializer_v8')
101
format_registry.register_lazy('9', 'bzrlib.chk_serializer',
102
'chk_serializer_255_bigpage')
103
format_registry.register_lazy('10', 'bzrlib.chk_serializer',
104
'chk_bencode_serializer')