OneWayFailureUseCase<TYPE extends Failure, UsecaseParams extends Params> class abstract

A specialized Usecase designed to produce an optional Failure result, but no successful domain Entity.

It implements the Option functional pattern where:

• None: Represents Success (no failure occurred).
• Some(Failure): Represents a Problem found during the check.

✅ Benefits:

• Focused Purpose: Ideal for standalone validation logic, permission checks, or "guard clauses" that don't need to return data.
• UI Integration: Very easy to use in form validation where you only care if there is an error message to display.
• Lightweight: Avoids the overhead of defining a "Success" entity when the only goal is to verify a condition.

❌ Downsides:

• Inverted Intuition: Confusing that None means "everything is okay."
• Limited Flow: Cannot pass data forward. If you need to validate and then use the validated data, a standard UseCase or UseCaseHandler is better.

Best for: Validation or verification Usecase (e.g., "Check if Username is Taken" or "Verify Premium Subscription Status").

Type Parameter:

• TYPE: The specific type of Failure returned if the condition fails.

Inheritance

• Object
• Case<UsecaseParams>
• OneWayFailureUseCase

Constructors

OneWayFailureUseCase()

const

Properties

hashCode → int

The hash code for this object.

no setter, inherited

runtimeType → Type

A representation of the runtime type of the object.

no setter, inherited

Methods

call(UsecaseParams params) → Future<Option<TYPE>>

Executes the logic and returns an Option containing the Failure if the condition fails, or None if the check passes (success).

override

noSuchMethod(Invocation invocation) → dynamic

Invoked when a nonexistent method or property is accessed.

inherited

toString() → String

A string representation of this object.

inherited

Operators

operator ==(Object other) → bool

The equality operator.

inherited