Gets the ``Comment`` specified by its ``Id``.

        arg:    comment_id (osid.id.Id): the ``Id`` of the ``Comment``
                to retrieve
        return: (osid.commenting.Comment) - the returned ``Comment``
        raise:  NotFound - no ``Comment`` found with the given ``Id``
        raise:  NullArgument - ``comment_id`` is ``null``
        raise:  OperationFailed - unable to complete request
        raise:  PermissionDenied - authorization failure
        *compliance: mandatory -- This method must be implemented.*

def get_comment(self, comment_id):
        """Gets the ``Comment`` specified by its ``Id``.

        arg:    comment_id (osid.id.Id): the ``Id`` of the ``Comment``
                to retrieve
        return: (osid.commenting.Comment) - the returned ``Comment``
        raise:  NotFound - no ``Comment`` found with the given ``Id``
        raise:  NullArgument - ``comment_id`` is ``null``
        raise:  OperationFailed - unable to complete request
        raise:  PermissionDenied - authorization failure
        *compliance: mandatory -- This method must be implemented.*

        """
        # Implemented from template for
        # osid.resource.ResourceLookupSession.get_resource
        # NOTE: This implementation currently ignores plenary view
        collection = JSONClientValidated('commenting',
                                         collection='Comment',
                                         runtime=self._runtime)
        result = collection.find_one(
            dict({'_id': ObjectId(self._get_id(comment_id, 'commenting').get_identifier())},
                 **self._view_filter()))
        return objects.Comment(osid_object_map=result, runtime=self._runtime, proxy=self._proxy)