Scalactic 3.2.16/org.scalactic/NormalizingEquivalence

NormalizingEquivalence

trait NormalizingEquivalence[A] extends Equivalence[A]

An Equivalence[A] implementation that determines the equality of two objects by normalizing one or both objects, then comparing the results using an “after normalization” Equivalence referenced from the afterNormalizationEquivalence member. By default, the afterNormalizationEquivalence is an instance of Equivalence.default[A].

NormalizingEquivalence is returned by the Explicitly DSL's “after being” syntax, using for the afterNormalizationEquivalence the implicit Equivalence in scope for the type of Normalization passed to being. Here's an example:

scala> import org.scalactic._
import org.scalactic._

scala> import Explicitly._
import Explicitly._

scala> val lowerCased: Normalization[String] = StringNormalizations.lowerCased
lowerCased: org.scalactic.Normalization[String] = lowerCased

scala> after being lowerCased
res0: org.scalactic.NormalizingEquivalence[String] = ComposedNormalizingEquivalence(Equality.default,lowerCased)
Source:
NormalizingEquivalence.scala
trait Equivalence[A]
class Object
trait Matchable
class Any

Value members

Abstract methods

def normalized(a: A): A

Returns a normalized form of the passed object.

Returns a normalized form of the passed object.

If the passed object is already in normal form, this method may return the same instance passed.

Type parameters:
A

the type of the object to normalize

Value parameters:
a

the object to normalize

Returns:

the normalized form of the passed object

Source:
NormalizingEquivalence.scala

Concrete methods

final def and(other: Normalization[A]): NormalizingEquivalence[A]

Returns a new NormalizingEquivalence that combines this and the passed Normalization.

Returns a new NormalizingEquivalence that combines this and the passed Normalization.

The normalized method of the NormalizingEquivalence's returned by this method returns a result obtained by forwarding the passed value first to this NormalizingEquivalence's implementation of the method, then passing that result to the passed Normalization's implementation of the method. Essentially, the body of the composed normalized method is:

uniformityPassedToAnd.normalized(uniformityOnWhichAndWasInvoked.normalized(a))
Value parameters:
other

a Normalization to 'and' with this one

Returns:

a NormalizingEquivalence representing the composition of this and the passed Normalization

Source:
NormalizingEquivalence.scala
final def areEquivalent(a: A, b: A): Boolean

Determines the equality of two objects by normalizing the left-hand value, a, and the right-hand value, b, then passing them to areEquivalent method of afterNormalizationEquivalence.

Determines the equality of two objects by normalizing the left-hand value, a, and the right-hand value, b, then passing them to areEquivalent method of afterNormalizationEquivalence.

Both the left-hand value, a, and right-hand value, b, are normalized by passing them to the normalized method of this NormalizingEquivalence.

Source:
NormalizingEquivalence.scala
final def toNormalization: Normalization[A]

Converts this NormalizingEquivalence to a Normalization.

Converts this NormalizingEquivalence to a Normalization.

Returns:

a Normalization whose normalized method is implemented by forwarding to the normalized method of this NormalizingEquivalence.

Source:
NormalizingEquivalence.scala

Concrete fields

val afterNormalizationEquivalence: Equivalence[A]

The Equivalence with which to determine equality after normalizing the left-hand and right-hand values.

The Equivalence with which to determine equality after normalizing the left-hand and right-hand values.

In this trait's implementation, this val is initialized with the result of invoking Equivalence.default[A]. Thus default Equivalence is the default afterNormalizationEquivalence. This may be changed by overriding afterNormalizationEquivalence in subclasses.

Source:
NormalizingEquivalence.scala