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erikrozendaal/gist:6294954

Last active December 21, 2015 10:49
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Scalaz equivalent to Hibernate's JSR-303 based @notempty annotation
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gistfile1.scala
def notNull[A](a: A): Validation[String, A] =
if (a != null) a.success else "may not be null".failure
def size[A <% Traversable[_]](min: Int = 0, max: Int = Int.MaxValue)(a: A): Validation[String, A] =
if (min to max contains a.size) a.success else s"size must be between $min and $max".failure
// Composing notNull and size, like https://github.com/hibernate/hibernate-validator/blob/master/engine/src/main/java/org/hibernate/validator/constraints/NotEmpty.java#L48
def notEmpty[A <% Traversable[_]](a: A): Validation[String, A] =
notNull(a) flatMap size(min = 1)
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Link to @notempty annotation https://github.com/hibernate/hibernate-validator/blob/master/engine/src/main/java/org/hibernate/validator/constraints/NotEmpty.java#L48

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