| /* |
| * Copyright 2016-2017 JetBrains s.r.o. |
| * |
| * 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 kotlinx.coroutines.experimental.channels8 |
| |
| import kotlinx.coroutines.experimental.CommonPool |
| import kotlinx.coroutines.experimental.channels.ReceiveChannel |
| import kotlinx.coroutines.experimental.channels.consumeEach |
| import kotlinx.coroutines.experimental.channels.produce |
| import kotlinx.coroutines.experimental.runBlocking |
| import java.util.* |
| import java.util.function.BiConsumer |
| import java.util.function.Consumer |
| import java.util.stream.Collector |
| import java.util.stream.Stream |
| import java.util.stream.StreamSupport |
| import kotlin.coroutines.experimental.CoroutineContext |
| |
| /** |
| * Creates a [ProducerJob] to read all element of the [Stream]. |
| */ |
| public fun <E> Stream<E>.asReceiveChannel(context: CoroutineContext = CommonPool): ReceiveChannel<E> = produce(context) { |
| for (element in this@asReceiveChannel) |
| send(element) |
| } |
| |
| /** |
| * Creates a [Stream] of elements in this [ReceiveChannel]. |
| */ |
| public fun <E : Any> ReceiveChannel<E>.asStream(): Stream<E> = StreamSupport.stream<E>(SpliteratorAdapter(this), false) |
| |
| /** |
| * Applies the [collector] to the [ReceiveChannel] |
| */ |
| public suspend fun <T, A : Any, R> ReceiveChannel<T>.collect(collector: Collector<T, A, R>): R { |
| val container: A = collector.supplier().get() |
| val accumulator: BiConsumer<A, T> = collector.accumulator() |
| consumeEach { accumulator.accept(container, it) } |
| return collector.finisher().apply(container) |
| } |
| |
| private class SpliteratorAdapter<E : Any>(val channel: ReceiveChannel<E>) : Spliterator<E> { |
| override fun estimateSize(): Long = Long.MAX_VALUE |
| |
| override fun forEachRemaining(action: Consumer<in E>) { |
| runBlocking { |
| for (element in channel) |
| action.accept(element) |
| } |
| } |
| |
| override fun tryAdvance(action: Consumer<in E>): Boolean = runBlocking { |
| val element = channel.receiveOrNull() |
| if (element != null) { |
| action.accept(element) |
| true |
| } else false |
| } |
| |
| override fun characteristics(): Int = characteristics |
| |
| override fun trySplit(): Spliterator<E>? = null |
| |
| private companion object { |
| @JvmStatic |
| private val characteristics = Spliterator.ORDERED or Spliterator.NONNULL |
| } |
| } |