akka.stream.impl.ConstantFun.scala Maven / Gradle / Ivy
/*
* Copyright (C) 2015-2020 Lightbend Inc.
*/
package akka.stream.impl
import akka.annotation.InternalApi
import akka.japi.function.{ Function => JFun, Function2 => JFun2 }
import akka.japi.{ Pair => JPair }
/**
* INTERNAL API
*/
@deprecated("Use akka.util.ConstantFun instead", "2.5.0")
@InternalApi private[akka] object ConstantFun {
private[this] val JavaIdentityFunction = new JFun[Any, Any] {
@throws(classOf[Exception]) override def apply(param: Any): Any = param
}
val JavaPairFunction = new JFun2[AnyRef, AnyRef, AnyRef JPair AnyRef] {
def apply(p1: AnyRef, p2: AnyRef): AnyRef JPair AnyRef = JPair(p1, p2)
}
def javaCreatePairFunction[A, B]: JFun2[A, B, JPair[A, B]] = JavaPairFunction.asInstanceOf[JFun2[A, B, JPair[A, B]]]
def javaIdentityFunction[T]: JFun[T, T] = JavaIdentityFunction.asInstanceOf[JFun[T, T]]
def scalaIdentityFunction[T]: T => T = conforms.asInstanceOf[Function[T, T]]
def scalaAnyToNone[A, B]: A => Option[B] = none
def scalaAnyTwoToNone[A, B, C]: (A, B) => Option[C] = two2none
def javaAnyToNone[A, B]: A => Option[B] = none
val conforms = (a: Any) => a
val zeroLong = (_: Any) => 0L
val oneLong = (_: Any) => 1L
val oneInt = (_: Any) => 1
val none = (_: Any) => None
val two2none = (_: Any, _: Any) => None
}