httk.core.views.backend

Classes

Backend

Abstract base class to be subclassed into classes that keep track of alternative

Module Contents

class httk.core.views.backend.Backend[BackendT: Backend](backend, **hints)

Bases: abc.ABC

Abstract base class to be subclassed into classes that keep track of alternative representations of certain types of data, all adhering to a common API interface.

The class variable backend_classes is a list of all classes that can carry the kind of data the subclass represents.

A system of “hints” are used primarily to disambiguate between multiple valid interpretations of the same input object. Unless otherwise documented for a specific backend, extra hints that do not affect this interpretation are ignored.

A set of backends are meant to be combined with a set of Views.

Concrete backends implement _backend_adopt to accept an object and return an initialized backend instance, or None to decline it. The kind hint convention is used to disambiguate between multiple valid interpretations.

Parameters:

• backend (Any) – Source value or backend being adopted by the concrete backend.

• **hints (Any) – Backend-specific initialization hints.

backend_classes: ClassVar[list[type[Backend[Any]]]]

unwrap()

Return the most raw representation possible of this backend, i.e., if it uses a backend with an internal representaion - or if it can (possibly lossly) convert itself into a more raw representation that still would be recognized as a <Something>Like type, that representation will be returned. If this is not possible, the instance itself is returned.

Returns:

The backend’s most raw available representation.

Return type:

Any