def _extract_from_serverless_api(self, logical_id, api_resource, collector):
        """
        Extract APIs from AWS::Serverless::Api resource by reading and parsing Swagger documents. The result is added
        to the collector.

        Parameters
        ----------
        logical_id : str
            Logical ID of the resource

        api_resource : dict
            Resource definition, including its properties

        collector : ApiCollector
            Instance of the API collector that where we will save the API information
        """

        properties = api_resource.get("Properties", {})
        body = properties.get("DefinitionBody")
        uri = properties.get("DefinitionUri")
        binary_media = properties.get("BinaryMediaTypes", [])

        if not body and not uri:
            # Swagger is not found anywhere.
            LOG.debug("Skipping resource '%s'. Swagger document not found in DefinitionBody and DefinitionUri",
                      logical_id)
            return

        reader = SamSwaggerReader(definition_body=body,
                                  definition_uri=uri,
                                  working_dir=self.cwd)
        swagger = reader.read()
        parser = SwaggerParser(swagger)
        apis = parser.get_apis()
        LOG.debug("Found '%s' APIs in resource '%s'", len(apis), logical_id)

        collector.add_apis(logical_id, apis)
        collector.add_binary_media_types(logical_id, parser.get_binary_media_types())  # Binary media from swagger
        collector.add_binary_media_types(logical_id, binary_media)