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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.python
import java.io.File
import java.util.{List => JList}
import scala.collection.JavaConverters._
import scala.collection.mutable.ArrayBuffer
import org.apache.spark.SparkContext
import org.apache.spark.api.java.{JavaRDD, JavaSparkContext}
private[spark] object PythonUtils {
/** Get the PYTHONPATH for PySpark, either from SPARK_HOME, if it is set, or from our JAR */
def sparkPythonPath: String = {
val pythonPath = new ArrayBuffer[String]
for (sparkHome <- sys.env.get("SPARK_HOME")) {
pythonPath += Seq(sparkHome, "python", "lib", "pyspark.zip").mkString(File.separator)
pythonPath += Seq(sparkHome, "python", "lib", "py4j-0.10.4-src.zip").mkString(File.separator)
}
pythonPath ++= SparkContext.jarOfObject(this)
pythonPath.mkString(File.pathSeparator)
}
/** Merge PYTHONPATHS with the appropriate separator. Ignores blank strings. */
def mergePythonPaths(paths: String*): String = {
paths.filter(_ != "").mkString(File.pathSeparator)
}
def generateRDDWithNull(sc: JavaSparkContext): JavaRDD[String] = {
sc.parallelize(List("a", null, "b"))
}
/**
* Convert list of T into seq of T (for calling API with varargs)
*/
def toSeq[T](vs: JList[T]): Seq[T] = {
vs.asScala
}
/**
* Convert list of T into a (Scala) List of T
*/
def toList[T](vs: JList[T]): List[T] = {
vs.asScala.toList
}
/**
* Convert list of T into array of T (for calling API with array)
*/
def toArray[T](vs: JList[T]): Array[T] = {
vs.toArray().asInstanceOf[Array[T]]
}
/**
* Convert java map of K, V into Map of K, V (for calling API with varargs)
*/
def toScalaMap[K, V](jm: java.util.Map[K, V]): Map[K, V] = {
jm.asScala.toMap
}
}
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