Lens

open class Lens<in IN : Any, out FINAL>(val meta: Meta, lensGet: (IN) -> FINAL) : LensExtractor<IN, FINAL> , Iterable<Meta> (source)

A Lens provides the uni-directional extraction of an entity from a target.

Constructors

constructor(meta: Meta, lensGet: (IN) -> FINAL)

Convert the result of a lens extraction to a Result4k type which

fun HttpHandler.debug(out: PrintStream = System.out, debugStream: Boolean = false): HttpHandler

open fun extract(target: IN): FINAL

Lens operation to get the value from the target. Synonym for invoke(IN)

open operator fun <R : IN> get(target: R): FINAL

Lens operation to get the value from the target. Synonym for invoke(IN)

open operator override fun invoke(target: IN): FINAL

Lens operation to get the value from the target

open operator override fun iterator(): Iterator<Meta>

Check the content of any lens on a request for routing purposes.

fun <IN : Any, VALUE : Value<T>, T : Any> Lens<IN, String>.ofOrLensFailure(vf: ValueFactory<VALUE, T>, value: String): VALUE

Convert ot throw a lens failure when constructing a value type

Restrict the type that this Lens can extract from

open override fun toString(): String

Convert a synchronous HttpHandler API to mimic AsyncHttpClient