<commit_before># telepathy-python - Base classes defining the interfaces of the Telepathy framework
#
# Copyright (C) 2009-2010 Collabora Limited
#
# 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 2.1 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., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA

import warnings

from telepathy.errors import NotImplemented

from telepathy.interfaces import (CHANNEL_INTERFACE,
                                  CHANNEL_TYPE_CONTACT_LIST)

from telepathy.constants import HANDLE_TYPE_NONE

from telepathy.server.handle import NoneHandle

class ChannelManager(object):
    def __init__(self, connection):
        self._conn = connection

        self._requestable_channels = dict()
        self._channels = dict()

        self._fixed_properties = dict()
        self._available_properties = dict()

        self._requestables = dict()

    def close(self):
        """Close channel manager and all the existing channels."""
        for channel_type in self._requestable_channels:
            for channels in self._channels[channel_type].values():
                for channel in channels:
                    try:
                        if channel._type != CHANNEL_TYPE_CONTACT_LIST:
                            channel.Close()
                    except:
                        pass
                    try:
                        channel.remove_from_connection()
                    except:
                        pass

    def remove_channel(self, channel):
        "Remove channel from the channel manager"
        for channel_type in self._requestable_channels:
            for handle, channels in self._channels[channel_type].items():
                if channel in channels :
                    channels.remove(channel)

    def _get_type_requested_handle(self, props):
        """Return the type, request and target handle from the requested
        properties"""
        type = props[CHANNEL_INTERFACE + '.ChannelType']
        requested = props[CHANNEL_INTERFACE + '.Requested']

        target_handle_type = \
            props.get(CHANNEL_INTERFACE + '.TargetHandleType', HANDLE_TYPE_NONE)

        if target_handle_type == HANDLE_TYPE_NONE:
            handle = NoneHandle()
        else:
            target_handle = props[CHANNEL_INTERFACE + '.TargetHandle']
            handle = self._conn._handles[target_handle_type, target_handle]

        return (type, requested, handle)

    def existing_channel(self, props):
        """ Return a channel corresponding to theses properties if such
        one exists, otherwhise return None. Default implementation will
        return the last created channel of the same kind identified by
        handle and type.
        Connection Manager should subclass this function
        to implement more appropriate behaviour. """

        type, _, handle = self._get_type_requested_handle(props)

        if type in self._channels:
            if handle in self._channels[type]:
                if len(self._channels[type][handle]) > 0:
                    return self._channels[type][handle][-1]

        return None

    def channel_exists(self, props):
        """ Return True if channel exist with theses props, False otherwhise"""
        return self.existing_channel(props) != None

    def create_channel_for_props(self, props, signal=True, **args):
        """Create a new channel with theses properties"""
        type, _, handle = self._get_type_requested_handle(props)

        if type not in self._requestable_channels:
            raise NotImplemented('Unknown channel type "%s"' % type)

        channel = self._requestable_channels[type](
            props, **args)

        self._conn.add_channels([channel], signal=signal)
        if handle.get_type() != HANDLE_TYPE_NONE and type in self._channels:
            self._channels[type].setdefault(handle, []).append(channel)

        return channel

    def channel_for_props(self, props, signal=True, **args):
        channel = self.existing_channel(props)
        """Return an existing channel with theses properties if it already
        exists, otherwhise return a new one"""
        if channel:
            return channel
        else:
            return self.create_channel_for_props(props, signal, **args)

    # Should use implement_channel_classes instead.
    def _implement_channel_class(self, type, make_channel, fixed, available):
        """Implement channel types in the channel manager, and add one channel
        class that is retrieved in RequestableChannelClasses.

        self.implement_channel_classes should be used instead, as it allows
        implementing multiple channel classes."""
        warnings.warn('deprecated in favour of implement_channel_classes',
            DeprecationWarning)

        self._requestable_channels[type] = make_channel
        self._channels.setdefault(type, {})

        self._fixed_properties[type] = fixed
        self._available_properties[type] = available

    # Use this function instead of _implement_channel_class.
    def implement_channel_classes(self, type, make_channel, classes):
        """Implement channel types in the channel manager, and add channel
        classes that are retrieved in RequestableChannelClasses.

          @type: the channel type
          @make_channel: a function to call which returns a Channel object
          @classes: a list of channel classes. E.g.

            [ ( { '...ChannelType': '...Text', '...TargetHandleType': HANDLE_TYPE_CONTACT },
                ['...TargetHandle'] )
            ]

            See the spec for more documentation on the
            Requestable_Channel_Class struct.
        """
        self._requestable_channels[type] = make_channel
        self._channels.setdefault(type, {})

        self._requestables[type] = classes

    def get_requestable_channel_classes(self):
        """Return all the channel types that can be created"""
        retval = []

        for channel_type in self._requestable_channels:
            retval.extend(self._requestables.get(channel_type, []))

            # _implement_channel_class was used.
            if channel_type in self._fixed_properties:
                retval.append((self._fixed_properties[channel_type],
                    self._available_properties.get(channel_type, [])))


        return retval<commit_msg>Add new way to set requestable channel classes on channel manager<commit_after># telepathy-python - Base classes defining the interfaces of the Telepathy framework
#
# Copyright (C) 2009-2010 Collabora Limited
#
# 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 2.1 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., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA

import warnings

from telepathy.errors import NotImplemented

from telepathy.interfaces import (CHANNEL_INTERFACE,
                                  CHANNEL_TYPE_CONTACT_LIST)

from telepathy.constants import HANDLE_TYPE_NONE

from telepathy.server.handle import NoneHandle

class ChannelManager(object):
    def __init__(self, connection):
        self._conn = connection

        self._requestable_channels = dict()
        self._channels = dict()

        self._fixed_properties = dict()
        self._available_properties = dict()

        self._requestables = list()

    def close(self):
        """Close channel manager and all the existing channels."""
        for channel_type in self._requestable_channels:
            for channels in self._channels[channel_type].values():
                for channel in channels:
                    try:
                        if channel._type != CHANNEL_TYPE_CONTACT_LIST:
                            channel.Close()
                    except:
                        pass
                    try:
                        channel.remove_from_connection()
                    except:
                        pass

    def remove_channel(self, channel):
        "Remove channel from the channel manager"
        for channel_type in self._requestable_channels:
            for handle, channels in self._channels[channel_type].items():
                if channel in channels :
                    channels.remove(channel)

    def _get_type_requested_handle(self, props):
        """Return the type, request and target handle from the requested
        properties"""
        type = props[CHANNEL_INTERFACE + '.ChannelType']
        requested = props[CHANNEL_INTERFACE + '.Requested']

        target_handle_type = \
            props.get(CHANNEL_INTERFACE + '.TargetHandleType', HANDLE_TYPE_NONE)

        if target_handle_type == HANDLE_TYPE_NONE:
            handle = NoneHandle()
        else:
            target_handle = props[CHANNEL_INTERFACE + '.TargetHandle']
            handle = self._conn._handles[target_handle_type, target_handle]

        return (type, requested, handle)

    def existing_channel(self, props):
        """ Return a channel corresponding to theses properties if such
        one exists, otherwhise return None. Default implementation will
        return the last created channel of the same kind identified by
        handle and type.
        Connection Manager should subclass this function
        to implement more appropriate behaviour. """

        type, _, handle = self._get_type_requested_handle(props)

        if type in self._channels:
            if handle in self._channels[type]:
                if len(self._channels[type][handle]) > 0:
                    return self._channels[type][handle][-1]

        return None

    def channel_exists(self, props):
        """ Return True if channel exist with theses props, False otherwhise"""
        return self.existing_channel(props) != None

    def create_channel_for_props(self, props, signal=True, **args):
        """Create a new channel with theses properties"""
        type, _, handle = self._get_type_requested_handle(props)

        if type not in self._requestable_channels:
            raise NotImplemented('Unknown channel type "%s"' % type)

        channel = self._requestable_channels[type](
            props, **args)

        self._conn.add_channels([channel], signal=signal)
        if handle.get_type() != HANDLE_TYPE_NONE and type in self._channels:
            self._channels[type].setdefault(handle, []).append(channel)

        return channel

    def channel_for_props(self, props, signal=True, **args):
        channel = self.existing_channel(props)
        """Return an existing channel with theses properties if it already
        exists, otherwhise return a new one"""
        if channel:
            return channel
        else:
            return self.create_channel_for_props(props, signal, **args)

    # Should use implement_channel_classes instead.
    def _implement_channel_class(self, type, make_channel, fixed, available):
        """Implement channel types in the channel manager, and add one channel
        class that is retrieved in RequestableChannelClasses.

        self.implement_channel_classes and self.set_requestable_channel_classes
        should be used instead, as it allows implementing multiple channel
        classes."""
        warnings.warn('deprecated in favour of implement_channel_classes',
            DeprecationWarning)

        self._requestable_channels[type] = make_channel
        self._channels.setdefault(type, {})

        self._fixed_properties[type] = fixed
        self._available_properties[type] = available

    # Use this function instead of _implement_channel_class.
    def implement_channel_classes(self, type, make_channel, classes=None):
        """Implement channel types in the channel manager, and add channel
        classes that are retrieved in RequestableChannelClasses.

          @type: the channel type
          @make_channel: a function to call which returns a Channel object
          @classes: (deprecated)

        The classes argument has been deprecated and the list of requestable
        channel classes should be set using set_requestable_channel_classes.
        """
        self._requestable_channels[type] = make_channel
        self._channels.setdefault(type, {})

        if classes is not None:
            warnings.warn('"classes" argument is deprecated',
                DeprecationWarning)
            self._requestables.extend(classes)

    def set_requestable_channel_classes(self, requestables):
        self._requestables = requestables

    def get_requestable_channel_classes(self):
        """Return all the channel types that can be created"""
        retval = self._requestables

        # backward compatibility
        for channel_type in self._requestable_channels:
            if channel_type in self._fixed_properties:
                retval.append((self._fixed_properties[channel_type],
                    self._available_properties.get(channel_type, [])))

        return retval
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