com.spotify.scio.extra.sparkey.instances.SparkeySet.scala Maven / Gradle / Ivy
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/*
* Copyright 2021 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.extra.sparkey.instances
import com.spotify.sparkey.SparkeyReader
import org.apache.beam.sdk.coders.Coder
import org.apache.beam.sdk.util.CoderUtils
import scala.jdk.CollectionConverters._
/**
* Enhanced version of `SparkeyReader` that assumes the underlying Sparkey is encoded with a given
* Coder, but contains no values (i.e.: only used as an on-disk HashSet).
*/
class SparkeySet[T](val sparkey: SparkeyReader, val coder: Coder[T]) extends SparkeySetBase[T] {
override def contains(elem: T): Boolean =
sparkey.getAsEntry(CoderUtils.encodeToByteArray(coder, elem)) != null
override def iterator: Iterator[T] =
sparkey.iterator.asScala.map(e => CoderUtils.decodeFromByteArray(coder, e.getKey))
}