139 lines
4.5 KiB
Python
139 lines
4.5 KiB
Python
# Copyright (C) 2007, One Laptop Per Child
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#
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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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#
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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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#
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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., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
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import logging
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import gobject
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from sugar.datastore import dbus_helpers
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class DSMetadata(gobject.GObject):
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__gsignals__ = {
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'updated': (gobject.SIGNAL_RUN_FIRST, gobject.TYPE_NONE,
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([]))
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}
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def __init__(self, props=None):
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gobject.GObject.__init__(self)
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if not props:
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self._props = {}
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else:
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self._props = props
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default_keys = ['activity', 'mime_type']
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for key in default_keys:
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if not self._props.has_key(key):
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self._props[key] = ''
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def __getitem__(self, key):
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return self._props[key]
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def __setitem__(self, key, value):
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if not self._props.has_key(key) or self._props[key] != value:
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self._props[key] = value
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self.emit('updated')
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def __delitem__(self, key):
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del self._props[key]
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def has_key(self, key):
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return self._props.has_key(key)
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def get_dictionary(self):
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return self._props
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class DSObject:
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def __init__(self, object_id, metadata=None, file_path=None):
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self.object_id = object_id
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self._metadata = metadata
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self._file_path = file_path
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def get_metadata(self):
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if self._metadata is None and not self.object_id is None:
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metadata = DSMetadata(dbus_helpers.get_properties(self.object_id))
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self._metadata = metadata
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return self._metadata
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def set_metadata(self, metadata):
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if self._metadata != metadata:
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self._metadata = metadata
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metadata = property(get_metadata, set_metadata)
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def get_file_path(self):
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if self._file_path is None and not self.object_id is None:
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self.set_file_path(dbus_helpers.get_filename(self.object_id))
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return self._file_path
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def set_file_path(self, file_path):
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if self._file_path != file_path:
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self._file_path = file_path
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file_path = property(get_file_path, set_file_path)
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def get(object_id):
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logging.debug('datastore.get')
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metadata = dbus_helpers.get_properties(object_id)
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file_path = dbus_helpers.get_filename(object_id)
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ds_object = DSObject(object_id, DSMetadata(metadata), file_path)
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# TODO: register the object for updates
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return ds_object
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def create():
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return DSObject(object_id=None, metadata=DSMetadata(), file_path=None)
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def write(ds_object, reply_handler=None, error_handler=None):
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logging.debug('datastore.write')
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if ds_object.object_id:
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dbus_helpers.update(ds_object.object_id,
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ds_object.metadata.get_dictionary(),
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ds_object.file_path,
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reply_handler=reply_handler,
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error_handler=error_handler)
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else:
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ds_object.object_id = dbus_helpers.create(ds_object.metadata.get_dictionary(),
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ds_object.file_path)
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# TODO: register the object for updates
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logging.debug('Written object %s to the datastore.' % ds_object.object_id)
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def find(query, sorting=None, limit=None, offset=None, reply_handler=None,
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error_handler=None):
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if sorting:
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query['order_by'] = sorting
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if limit:
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query['limit'] = limit
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if offset:
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query['offset'] = offset
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props_list, total_count = dbus_helpers.find(query, reply_handler, error_handler)
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objects = []
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for props in props_list:
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if props.has_key('filename') and props['filename']:
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file_path = props['filename']
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del props['filename']
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else:
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file_path = None
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object_id = props['uid']
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del props['uid']
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ds_object = DSObject(object_id, DSMetadata(props), file_path)
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objects.append(ds_object)
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return objects, total_count
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