/*
 * Licensed to the Apache Software Foundation (ASF) under one or more
 * contributor license agreements. See the NOTICE file distributed with
 * this work for additional information regarding copyright ownership.
 * The ASF licenses this file to You under the Apache License, Version 2.0
 * (the "License"); you may not use this file except in compliance with
 * the License. You may obtain a copy of the License at
 *
 *    http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package docs.stream.operators.sourceorflow

object OptionalVia {
  def optionalViaExample(): Unit = {
    import org.apache.pekko.actor.ActorSystem
    import org.apache.pekko.stream.scaladsl.{ Flow, Keep, Source }

    implicit val system: ActorSystem = ActorSystem()

    // #optionalVia
    Source.optionalVia(
      Source(List(Some("1"), None, None, Some("4"))),
      Flow.fromFunction { (string: String) => string.toInt }
    )(Keep.none).runForeach(println)
    // Some(1)
    // None
    // None
    // Some(4)
    // #optionalVia
  }

}
