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# Copyright (C) 2007, One Laptop Per Child
#
# This library is free software; you can redistribute it and/or
# modify it under the terms of the GNU Lesser General Public
# License as published by the Free Software Foundation; either
# version 2 of the License, or (at your option) any later version.
#
# This library 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
# Lesser General Public License for more details.
#
# You should have received a copy of the GNU Lesser General Public
# License along with this library; if not, write to the
# Free Software Foundation, Inc., 59 Temple Place - Suite 330,
# Boston, MA 02111-1307, USA.
import logging
import gobject
from sugar.datastore import dbus_helpers
class DSMetadata(gobject.GObject):
__gsignals__ = {
'updated': (gobject.SIGNAL_RUN_FIRST, gobject.TYPE_NONE,
([]))
}
def __init__(self, props=None):
gobject.GObject.__init__(self)
if not props:
self._props = {}
else:
self._props = props
default_keys = ['activity', 'mime_type', 'title_set_by_user']
for key in default_keys:
if not self._props.has_key(key):
self._props[key] = ''
def __getitem__(self, key):
return self._props[key]
def __setitem__(self, key, value):
if not self._props.has_key(key) or self._props[key] != value:
self._props[key] = value
self.emit('updated')
def __delitem__(self, key):
del self._props[key]
def has_key(self, key):
return self._props.has_key(key)
def get_dictionary(self):
return self._props
class DSObject:
def __init__(self, object_id, metadata=None, file_path=None):
self.object_id = object_id
self._metadata = metadata
self._file_path = file_path
def get_metadata(self):
if self._metadata is None and not self.object_id is None:
metadata = DSMetadata(dbus_helpers.get_properties(self.object_id))
self._metadata = metadata
return self._metadata
def set_metadata(self, metadata):
if self._metadata != metadata:
self._metadata = metadata
metadata = property(get_metadata, set_metadata)
def get_file_path(self):
if self._file_path is None and not self.object_id is None:
self.set_file_path(dbus_helpers.get_filename(self.object_id))
return self._file_path
def set_file_path(self, file_path):
if self._file_path != file_path:
self._file_path = file_path
file_path = property(get_file_path, set_file_path)
def get(object_id):
logging.debug('datastore.get')
metadata = dbus_helpers.get_properties(object_id)
file_path = dbus_helpers.get_filename(object_id)
ds_object = DSObject(object_id, DSMetadata(metadata), file_path)
# TODO: register the object for updates
return ds_object
def create():
return DSObject(object_id=None, metadata=DSMetadata(), file_path=None)
def write(ds_object, reply_handler=None, error_handler=None):
logging.debug('datastore.write')
if ds_object.object_id:
dbus_helpers.update(ds_object.object_id,
ds_object.metadata.get_dictionary(),
ds_object.file_path,
reply_handler=reply_handler,
error_handler=error_handler)
else:
ds_object.object_id = dbus_helpers.create(ds_object.metadata.get_dictionary(),
ds_object.file_path)
# TODO: register the object for updates
logging.debug('Written object %s to the datastore.' % ds_object.object_id)
def delete(object_id):
logging.debug('datastore.delete')
dbus_helpers.delete(object_id)
def find(query, sorting=None, limit=None, offset=None, reply_handler=None,
error_handler=None):
if sorting:
query['order_by'] = sorting
if limit:
query['limit'] = limit
if offset:
query['offset'] = offset
props_list, total_count = dbus_helpers.find(query, reply_handler, error_handler)
objects = []
for props in props_list:
if props.has_key('filename') and props['filename']:
file_path = props['filename']
del props['filename']
else:
file_path = None
object_id = props['uid']
del props['uid']
ds_object = DSObject(object_id, DSMetadata(props), file_path)
objects.append(ds_object)
return objects, total_count
def mount(uri, options):
return dbus_helpers.mount(uri, options)
def unmount(mount_point_id):
dbus_helpers.unmount(mount_point_id)
def mounts():
return dbus_helpers.mounts()
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