Package org.seedstack.business.specification

Interface Specification<T>

Type Parameters:

T - the type of the candidate object the specification applies to.

All Known Subinterfaces:

SubstitutableSpecification<T>

All Known Implementing Classes:

AndSpecification, FalseSpecification, IdentitySpecification, NotSpecification, OrSpecification, TrueSpecification

Functional Interface:

This is a functional interface and can therefore be used as the assignment target for a lambda expression or method reference.

@FunctionalInterface
public interface Specification<T>

A Specification is a pattern that is able to tell if a candidate object matches some criteria. The specification has a method isSatisfiedBy(Object) that returns true if all criteria are met by the candidate.

Method Summary

Modifier and Type	Method	Description
default Specification<T>	and(Specification<? super T> other)	Compose this specification with another specification through a logical AND.
static <T> Specification<T>	any()	Special value for an always true specification.
default Predicate<T>	asPredicate()	Express this specification as a Java Predicate.
boolean	isSatisfiedBy(T candidate)	Evaluates if the candidate object passed as argument satisfies the specification.
default Specification<T>	negate()	Negate this specification.
static <T> Specification<T>	none()	Special value for an always false specification.
default Specification<T>	or(Specification<? super T> other)	Compose this specification with another specification through a logical OR.

Method Detail

any

static <T> Specification<T> any()

Special value for an always true specification.

Type Parameters:

T - the type of the candidate object the specification applies to.

Returns:

a TrueSpecification.

none

static <T> Specification<T> none()

Special value for an always false specification.

Type Parameters:

T - the type of the candidate object the specification applies to.

Returns:

a FalseSpecification.

and

default Specification<T> and(Specification<? super T> other)

Compose this specification with another specification through a logical AND.

Parameters:

other - the other specification.

Returns:

an AndSpecification composing this specification with the specification passed as argument.

negate

default Specification<T> negate()

Negate this specification.

Returns:

a NotSpecification negating this specification.

or

default Specification<T> or(Specification<? super T> other)

Compose this specification with another specification through a logical OR.

Parameters:

other - the other specification.

Returns:

an OrSpecification composing this specification with the specification passed as argument.

asPredicate

default Predicate<T> asPredicate()

Express this specification as a Java Predicate.

Returns:

the Predicate corresponding to this specification.

isSatisfiedBy

boolean isSatisfiedBy(T candidate)

Evaluates if the candidate object passed as argument satisfies the specification.

Parameters:

candidate - the candidate object to check.

Returns:

true if the candidate object satisfies the specification, false otherwise.