is it possible to implement the specification pattern in kot kotlinlang #announcements

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Title

m

Matthew Good

04/28/2019, 2:59 PM

is it possible to implement the specification pattern in kotlin? as i tried https://dzone.com/articles/java-using-specification but i get the following undefined references: Predicate CriteriaBuilder Root

d

Dominaezzz

04/28/2019, 3:02 PM

If C# can do it, Kotlin can do it.

p

Pavlo Liapota

04/28/2019, 3:11 PM

They are JPA classes https://www.objectdb.com/api/java/jpa/criteria/CriteriaBuilder

m

Matthew Good

04/28/2019, 3:19 PM

oh

the

specification pattern

is used to implement logic such as

val b = v("1").and("2").and("3").and("4")

in

val i = txt("1234")

val a = v("1234")

val b = v("1").and("2").and("3").and("4")

AssertEquals(a.peek() == b.peek())
// fails if both are not equal

in applications such as parser combinators right?

c

Casey Brooks

04/29/2019, 2:50 PM

I’ve actually built a small library for this https://copper-leaf.github.io/trellis/

Pretty easy to do overall, relies heavily on generics and extension functions

m

Matthew Good

04/29/2019, 3:03 PM

ill check it out

also @Casey Brooks https://kotlinlang.slack.com/archives/C0922A726/p1556543764297600

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