git.maemo.org Git - theonering/blob - src/tp/channelmanager.py

   1 # telepathy-python - Base classes defining the interfaces of the Telepathy framework
   2 #
   3 # Copyright (C) 2009 Collabora Limited
   4 #
   5 # This library is free software; you can redistribute it and/or
   6 # modify it under the terms of the GNU Lesser General Public
   7 # License as published by the Free Software Foundation; either
   8 # version 2.1 of the License, or (at your option) any later version.
   9 #
  10 # This library is distributed in the hope that it will be useful,
  11 # but WITHOUT ANY WARRANTY; without even the implied warranty of
  12 # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  13 # Lesser General Public License for more details.
  14 #
  15 # You should have received a copy of the GNU Lesser General Public
  16 # License along with this library; if not, write to the Free Software
  17 # Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
  18
  19 from telepathy.errors import NotImplemented
  20
  21 from telepathy.interfaces import (CHANNEL_INTERFACE,
  22                                  CHANNEL_TYPE_CONTACT_LIST)
  23
  24 class ChannelManager(object):
  25
  26     def __init__(self, connection):
  27         self._conn = connection
  28
  29         self._requestable_channel_classes = dict()
  30         self._channels = dict()
  31         self._fixed_properties = dict()
  32         self._available_properties = dict()
  33
  34     def close(self):
  35         """Close channel manager and all the existing channels."""
  36         for channel_type in self._requestable_channel_classes:
  37             for channels in self._channels[channel_type].values():
  38                 for channel in channels:
  39                     if channel._type == CHANNEL_TYPE_CONTACT_LIST:
  40                         channel.remove_from_connection()
  41                     else:
  42                         channel.Close()
  43
  44     def remove_channel(self, channel):
  45         "Remove channel from the channel manager"
  46         for channel_type in self._requestable_channel_classes:
  47             for handle, channels in self._channels[channel_type].items():
  48                 if channel in channels :
  49                     channels.remove(channel)
  50
  51     def _get_type_requested_handle(self, props):
  52         """Return the type, request and target handle from the requested
  53         properties"""
  54         type = props[CHANNEL_INTERFACE + '.ChannelType']
  55         requested = props[CHANNEL_INTERFACE + '.Requested']
  56         target_handle = int(props[CHANNEL_INTERFACE + '.TargetHandle'])
  57         target_handle_type = int(props[CHANNEL_INTERFACE + '.TargetHandleType'])
  58
  59         handle = self._conn._handles[target_handle_type, target_handle]
  60
  61         return (type, requested, handle)
  62
  63     def existing_channel(self, props):
  64         """ Return a channel corresponding to theses properties if such
  65         one exists, otherwhise return None. Default implementation will
  66         return the last created channel of the same kind identified by
  67         handle and type.
  68         Connection Manager should subclass this function
  69         to implement more appropriate behaviour. """
  70
  71         type, _, handle = self._get_type_requested_handle(props)
  72
  73         if type in self._channels:
  74             if handle in self._channels[type]:
  75                 if len(self._channels[type][handle]) > 0:
  76                     return self._channels[type][handle][-1]
  77
  78         return None
  79
  80     def channel_exists(self, props):
  81         """ Return True if channel exist with theses props, False otherwhise"""
  82         return self.existing_channel(props) != None
  83
  84     def create_channel_for_props(self, props, signal=True, **args):
  85         """Create a new channel with theses properties"""
  86         type, _, handle = self._get_type_requested_handle(props)
  87
  88         if type not in self._requestable_channel_classes:
  89             raise NotImplemented('Unknown channel type "%s"' % type)
  90
  91         channel = self._requestable_channel_classes[type](
  92             props, **args)
  93
  94         self._conn.add_channels([channel], signal=signal)
  95         if type in self._channels:
  96             self._channels[type].setdefault(handle, []).append(channel)
  97
  98         return channel
  99
 100     def channel_for_props(self, props, signal=True, **args):
 101         channel = self.existing_channel(props)
 102         """Return an existing channel with theses properties if it already
 103         exists, otherwhise return a new one"""
 104         if channel:
 105             return channel
 106         else:
 107             return self.create_channel_for_props(props, signal, **args)
 108
 109     def _implement_channel_class(self, type, make_channel, fixed, available):
 110         """Notify channel manager a channel with these properties can be created"""
 111         self._requestable_channel_classes[type] = make_channel
 112         self._channels.setdefault(type, {})
 113
 114         self._fixed_properties[type] = fixed
 115         self._available_properties[type] = available
 116
 117     def get_requestable_channel_classes(self):
 118         retval = []
 119
 120         for channel_type in self._requestable_channel_classes:
 121             retval.append((self._fixed_properties[channel_type],
 122                 self._available_properties[channel_type]))
 123
 124         return retval