Scala example source code file (package.scala)

This example Scala source code file (package.scala) is included in my "Source Code Warehouse" project. The intent of this project is to help you more easily find Scala source code examples by using tags.

All credit for the original source code belongs to scala-lang.org; I'm just trying to make examples easier to find. (For my Scala work, see my Scala examples and tutorials.)

Scala tags/keywords

indexoutofboundsexception, int, pariterator, parseq, repetition, seqsplitter, t, unsupportedoperationexception

The package.scala Scala example source code

/*                     __                                               *\
**     ________ ___   / /  ___     Scala API                            **
**    / __/ __// _ | / /  / _ |    (c) 2003-2013, LAMP/EPFL             **
**  __\ \/ /__/ __ |/ /__/ __ |    http://scala-lang.org/               **
** /____/\___/_/ |_/____/_/ | |                                         **
**                          |/                                          **
\*                                                                      */

package scala
package collection.parallel

package immutable {
  /** A (parallel) sequence consisting of `length` elements `elem`. Used in the `padTo` method.
   *
   *  @tparam T        type of the elements
   *  @param elem      the element in the repetition
   *  @param length    the length of the collection
   */
  private[parallel] class Repetition[T](elem: T, val length: Int) extends ParSeq[T] {
    self =>

    def apply(idx: Int) = if (0 <= idx && idx < length) elem else throw new IndexOutOfBoundsException("" + idx)
    override def seq = throw new UnsupportedOperationException
    def update(idx: Int, elem: T) = throw new UnsupportedOperationException

    class ParIterator(var i: Int = 0, val until: Int = length, elem: T = self.elem) extends SeqSplitter[T] {
      def remaining = until - i
      def hasNext = i < until
      def next = { i += 1; elem }
      def dup = new ParIterator(i, until, elem)
      def psplit(sizes: Int*) = {
        val incr = sizes.scanLeft(0)(_ + _)
        for ((start, end) <- incr.init zip incr.tail) yield new ParIterator(i + start, (i + end) min until, elem)
      }
      def split = psplit(remaining / 2, remaining - remaining / 2)
    }

    def splitter = new ParIterator
  }
}

package object immutable {
  /* package level methods */
  def repetition[T](elem: T, len: Int) = new Repetition(elem, len)
}