OperationAsyncData<E extends Object?, D extends Object?> class abstract

A sum type for asynchronous data that is obtained as a result of an operation.

Has four variations – initial, loading, success and error. success stores data, while error stores error and initial and loading are empty.

An example of usage would be a result of an HTTP request through its stages.

Implementers

• OperationAsyncDataError
• OperationAsyncDataInitial
• OperationAsyncDataLoading
• OperationAsyncDataSuccess

Annotations

• @immutable
• @sealed

Constructors

OperationAsyncData.error({required E error})

const

factory

OperationAsyncData.initial()

const

factory

OperationAsyncData.loading()

const

factory

OperationAsyncData.success({required D data})

const

factory

Properties

data → D?

no setter

error → E?

no setter

hasData → bool

no setter

hasError → bool

no setter

hashCode → int

The hash code for this object.

no setter, inherited

isError → bool

no setter

isInitial → bool

no setter

isLoading → bool

no setter

isSuccess → bool

no setter

runtimeType → Type

A representation of the runtime type of the object.

no setter, inherited

Methods

flatMap<B extends Object?>(OperationAsyncData<E, B> mapper(D data)) → OperationAsyncData<E, B>

map<B extends Object?>(B mapper(D data)) → OperationAsyncData<E, B>

mapError<A extends Object?>(A mapper(E error)) → OperationAsyncData<A, D>

match<R>({required R initial(OperationAsyncDataInitial<Object?, Object?> data), required R loading(OperationAsyncDataLoading<Object?, Object?> data), required R success(OperationAsyncDataSuccess<E, D> data), required R error(OperationAsyncDataError<E, D> data)}) → R

matchOr<R>({R initial(OperationAsyncDataInitial<Object?, Object?> data)?, R loading(OperationAsyncDataLoading<Object?, Object?> data)?, R success(OperationAsyncDataSuccess<E, D> data)?, R error(OperationAsyncDataError<E, D> data)?, required R fallback()}) → R

matchOrNull<R>({R initial(OperationAsyncDataInitial<Object?, Object?> data)?, R loading(OperationAsyncDataLoading<Object?, Object?> data)?, R success(OperationAsyncDataSuccess<E, D> data)?, R error(OperationAsyncDataError<E, D> data)?}) → R?

noSuchMethod(Invocation invocation) → dynamic

Invoked when a nonexistent method or property is accessed.

inherited

toString() → String

A string representation of this object.

inherited

when<R>({required R initial(), required R loading(), required R success(D data), required R error(E error)}) → R

whenOr<R>({R initial()?, R loading()?, R success(D data)?, R error(E error)?, required R fallback()}) → R

whenOrNull<R>({R initial()?, R loading()?, R success(D data)?, R error(E error)?}) → R?

Operators

operator ==(Object other) → bool

The equality operator.

inherited

Static Methods

fromOperation<E extends Object?, D extends Object?>({required Future<D> body(), required E onError(Object error, StackTrace stackTrace), bool shouldRethrow = false}) → Stream<OperationAsyncData<E, D>>