Compares requested format to supported formats and routes the response.

        :attribute switcher: A dictionary of format types and their respective response methods.

def render_to_response(self, context, **response_kwargs):
        '''
        Compares requested format to supported formats and routes the response.

        :attribute switcher: A dictionary of format types and their respective response methods.
        '''
        switcher = {
            'json': self.return_json_response,
            'opml': self.return_opml_response,
            'md': self.return_md_response,
            'textbundle': self.not_implemented,
            'xlsx': self.not_implemented,
        }
        if self.format not in switcher.keys():
            return self.not_implemented(context, **response_kwargs)
        return switcher[self.format](context, **response_kwargs)