com.spotify.scio.util.TupleFunctions.scala Maven / Gradle / Ivy

Go to download
/*
 * Copyright 2019 Spotify AB.
 *
 * Licensed 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 com.spotify.scio.util

import java.lang.{Iterable => JIterable}
import java.util.{List => JList}

import org.apache.beam.sdk.values.KV

import scala.jdk.CollectionConverters._

private[scio] object TupleFunctions {
  def kvToTuple[K, V](kv: KV[K, V]): (K, V) = (kv.getKey, kv.getValue)

  // specialized version of a common version of kvToTuple
  def klToTuple[K](kv: KV[K, java.lang.Long]): (K, Long) =
    (kv.getKey, kv.getValue)

  def kdToTuple[K](kv: KV[K, java.lang.Double]): (K, Double) =
    (kv.getKey, kv.getValue)

  def kvIterableToTuple[K, V](kv: KV[K, JIterable[V]]): (K, Iterable[V]) =
    (kv.getKey, kv.getValue.asScala)

  def kvListToTuple[K, V](kv: KV[K, JList[V]]): (K, Iterable[V]) =
    (
      kv.getKey,
      // We do not use getValue.asInstanceOf[JIterable[V]].asScala
      // this way we do not return a JIterableWrapper. This helps maintain
      // equality for `Iterable`s. See also: https://github.com/spotify/scio/pull/2483
      new Iterable[V] {
        override def iterator: Iterator[V] = kv.getValue.iterator().asScala
      }
    )
}