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/*
* 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 org.apache.spark.api.java
import org.apache.spark.rdd.RDD
import org.apache.spark.SparkContext.doubleRDDToDoubleRDDFunctions
import org.apache.spark.api.java.function.{Function => JFunction}
import org.apache.spark.util.StatCounter
import org.apache.spark.partial.{BoundedDouble, PartialResult}
import org.apache.spark.storage.StorageLevel
import java.lang.Double
import org.apache.spark.Partitioner
class JavaDoubleRDD(val srdd: RDD[scala.Double]) extends JavaRDDLike[Double, JavaDoubleRDD] {
override val classManifest: ClassManifest[Double] = implicitly[ClassManifest[Double]]
override val rdd: RDD[Double] = srdd.map(x => Double.valueOf(x))
override def wrapRDD(rdd: RDD[Double]): JavaDoubleRDD =
new JavaDoubleRDD(rdd.map(_.doubleValue))
// Common RDD functions
import JavaDoubleRDD.fromRDD
/** Persist this RDD with the default storage level (`MEMORY_ONLY`). */
def cache(): JavaDoubleRDD = fromRDD(srdd.cache())
/**
* Set this RDD's storage level to persist its values across operations after the first time
* it is computed. Can only be called once on each RDD.
*/
def persist(newLevel: StorageLevel): JavaDoubleRDD = fromRDD(srdd.persist(newLevel))
/**
* Mark the RDD as non-persistent, and remove all blocks for it from memory and disk.
* This method blocks until all blocks are deleted.
*/
def unpersist(): JavaDoubleRDD = fromRDD(srdd.unpersist())
/**
* Mark the RDD as non-persistent, and remove all blocks for it from memory and disk.
*
* @param blocking Whether to block until all blocks are deleted.
*/
def unpersist(blocking: Boolean): JavaDoubleRDD = fromRDD(srdd.unpersist(blocking))
// first() has to be overriden here in order for its return type to be Double instead of Object.
override def first(): Double = srdd.first()
// Transformations (return a new RDD)
/**
* Return a new RDD containing the distinct elements in this RDD.
*/
def distinct(): JavaDoubleRDD = fromRDD(srdd.distinct())
/**
* Return a new RDD containing the distinct elements in this RDD.
*/
def distinct(numPartitions: Int): JavaDoubleRDD = fromRDD(srdd.distinct(numPartitions))
/**
* Return a new RDD containing only the elements that satisfy a predicate.
*/
def filter(f: JFunction[Double, java.lang.Boolean]): JavaDoubleRDD =
fromRDD(srdd.filter(x => f(x).booleanValue()))
/**
* Return a new RDD that is reduced into `numPartitions` partitions.
*/
def coalesce(numPartitions: Int): JavaDoubleRDD = fromRDD(srdd.coalesce(numPartitions))
/**
* Return a new RDD that is reduced into `numPartitions` partitions.
*/
def coalesce(numPartitions: Int, shuffle: Boolean): JavaDoubleRDD =
fromRDD(srdd.coalesce(numPartitions, shuffle))
/**
* Return an RDD with the elements from `this` that are not in `other`.
*
* Uses `this` partitioner/partition size, because even if `other` is huge, the resulting
* RDD will be <= us.
*/
def subtract(other: JavaDoubleRDD): JavaDoubleRDD =
fromRDD(srdd.subtract(other))
/**
* Return an RDD with the elements from `this` that are not in `other`.
*/
def subtract(other: JavaDoubleRDD, numPartitions: Int): JavaDoubleRDD =
fromRDD(srdd.subtract(other, numPartitions))
/**
* Return an RDD with the elements from `this` that are not in `other`.
*/
def subtract(other: JavaDoubleRDD, p: Partitioner): JavaDoubleRDD =
fromRDD(srdd.subtract(other, p))
/**
* Return a sampled subset of this RDD.
*/
def sample(withReplacement: Boolean, fraction: Double, seed: Int): JavaDoubleRDD =
fromRDD(srdd.sample(withReplacement, fraction, seed))
/**
* Return the union of this RDD and another one. Any identical elements will appear multiple
* times (use `.distinct()` to eliminate them).
*/
def union(other: JavaDoubleRDD): JavaDoubleRDD = fromRDD(srdd.union(other.srdd))
// Double RDD functions
/** Add up the elements in this RDD. */
def sum(): Double = srdd.sum()
/**
* Return a [[org.apache.spark.util.StatCounter]] object that captures the mean, variance and count
* of the RDD's elements in one operation.
*/
def stats(): StatCounter = srdd.stats()
/** Compute the mean of this RDD's elements. */
def mean(): Double = srdd.mean()
/** Compute the variance of this RDD's elements. */
def variance(): Double = srdd.variance()
/** Compute the standard deviation of this RDD's elements. */
def stdev(): Double = srdd.stdev()
/**
* Compute the sample standard deviation of this RDD's elements (which corrects for bias in
* estimating the standard deviation by dividing by N-1 instead of N).
*/
def sampleStdev(): Double = srdd.sampleStdev()
/**
* Compute the sample variance of this RDD's elements (which corrects for bias in
* estimating the standard variance by dividing by N-1 instead of N).
*/
def sampleVariance(): Double = srdd.sampleVariance()
/** Return the approximate mean of the elements in this RDD. */
def meanApprox(timeout: Long, confidence: Double): PartialResult[BoundedDouble] =
srdd.meanApprox(timeout, confidence)
/** (Experimental) Approximate operation to return the mean within a timeout. */
def meanApprox(timeout: Long): PartialResult[BoundedDouble] = srdd.meanApprox(timeout)
/** (Experimental) Approximate operation to return the sum within a timeout. */
def sumApprox(timeout: Long, confidence: Double): PartialResult[BoundedDouble] =
srdd.sumApprox(timeout, confidence)
/** (Experimental) Approximate operation to return the sum within a timeout. */
def sumApprox(timeout: Long): PartialResult[BoundedDouble] = srdd.sumApprox(timeout)
}
object JavaDoubleRDD {
def fromRDD(rdd: RDD[scala.Double]): JavaDoubleRDD = new JavaDoubleRDD(rdd)
implicit def toRDD(rdd: JavaDoubleRDD): RDD[scala.Double] = rdd.srdd
}
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