Documentation
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Index ¶
Constants ¶
This section is empty.
Variables ¶
This section is empty.
Functions ¶
func ClearRegistry ¶
func ClearRegistry()
ClearRegistry removes all registered factories. Useful in tests to reset global state.
func MarshalPolymorphicJSON ¶
func MarshalPolymorphicJSON(obj Polymorphic) ([]byte, error)
MarshalPolymorphicJSON is a helper that marshals a Polymorphic object into the envelope format used by this package.
func Register ¶
func Register[T Polymorphic](factory func() T)
Register registers a factory for a Polymorphic type using a factory function that returns the concrete instance. The registration uses the discriminator value returned by the instance produced by the factory.
func RegisterType ¶
func RegisterType[T any]()
RegisterType is a convenience helper that registers a type T where *T implements Polymorphic. It will panic if *T does not implement the Polymorphic interface.
func RegisterWithDiscriminator ¶
func RegisterWithDiscriminator(discriminator string, factory TypeFactory)
RegisterWithDiscriminator stores a factory function under the given discriminator. The factory should return a pointer to a zero-value instance of the concrete type.
Types ¶
type Envelope ¶
Envelope represents a marshaled polymorphic value. The `$type` field contains the discriminator and `Content` holds the concrete value after unmarshaling.
func NewEnvelope ¶
func NewEnvelope(obj Polymorphic) *Envelope
NewEnvelope creates an Envelope wrapping a polymorphic object. The Envelope contains the discriminator value and the content to be marshaled. The discriminator is obtained by calling obj.GetDiscriminator().
func UnmarshalPolymorphicJSON ¶
UnmarshalPolymorphicJSON unmarshals data into an Envelope and resolves the contained polymorphic value using the registered factory for the discriminator value.
func (*Envelope) MarshalJSON ¶
MarshalJSON implements json.Marshaler for Envelope. It validates that the discriminator is registered and marshals the content into a small envelope object containing `$type` and `content`.
func (*Envelope) UnmarshalJSON ¶
UnmarshalJSON implements json.Unmarshaler for Envelope. It expects a JSON object with a `$type` discriminator and a `content` field. The content is unmarshaled into a concrete instance returned by the registered factory for that discriminator.
type Polymorphic ¶
type Polymorphic interface {
GetDiscriminator() string
}
Polymorphic is implemented by types that expose a discriminator string used to identify the concrete implementation when serializing or deserializing polymorphic values.
func CreateInstance ¶
func CreateInstance(discriminator string) (Polymorphic, error)
CreateInstance creates a new instance for the given discriminator. It returns the instance as a Polymorphic interface or an error if the discriminator is not registered.
type TypeFactory ¶
type TypeFactory = func() any
TypeFactory creates instances of registered types.
func LoadFactory ¶
func LoadFactory(discriminator string) (TypeFactory, error)
LoadFactory returns the factory function registered for the discriminator, or an error if there is none.
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