ValueObject<Failure, T> class abstract

Extend this abstract class to create a validated value object class.

A value object is an object that contains attributes, but has no conceptual identity.

class RequiredString extends ValueObject<String, String> {
 final Either<String, String> value;

 factory RequiredString(String input) {
   assert(input != null);
   if (input.isNotEmpty) {
     return RequiredString._(right(input));
   } else {
     return RequiredString._(left('Value must not be empty'));
   }
 }

 RequiredString._(this.value);
}

Annotations

• @immutable

Constructors

ValueObject()

Creates a ValueObject

const

Properties

hashCode → int

The hash code for this object.

no setter, override

isValid → bool

True if this is valid.

no setter

runtimeType → Type

A representation of the runtime type of the object.

no setter, inherited

value → Either<Failure, T>

The value of this ValueObject

no setter

Methods

getOrCrash() → T

If this is valid, returns the value. Otherwise, throws UnexpectedValueError.

getOrElse(T dflt) → T

If this is valid, returns the value. Otherwise, returns dflt.

noSuchMethod(Invocation invocation) → dynamic

Invoked when a nonexistent method or property is accessed.

inherited

toString() → String

A string representation of this object.

override

Operators

operator ==(Object o) → bool

The equality operator.

override