Scala example source code file (Directory.scala)

This example Scala source code file (Directory.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

boolean, directory, file, int, iterator, jfile, none, option, path, string

The Directory.scala Scala example source code

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

package scala
package reflect
package io

import java.io.{ File => JFile }
/**
 * ''Note:  This library is considered experimental and should not be used unless you know what you are doing.''
 */
object Directory {
  import scala.util.Properties.userDir

  private def normalizePath(s: String) = Some(apply(Path(s).normalize))
  def Current: Option[Directory]  = if (userDir == "") None else normalizePath(userDir)

  def apply(path: Path): Directory = path.toDirectory

  // Like File.makeTemp but creates a directory instead
  def makeTemp(prefix: String = Path.randomPrefix, suffix: String = null, dir: JFile = null): Directory = {
    val path = File.makeTemp(prefix, suffix, dir)
    path.delete()
    path.createDirectory()
  }
}

/** An abstraction for directories.
 *
 *  @author  Paul Phillips
 *  @since   2.8
 *
 *  ''Note:  This is library is considered experimental and should not be used unless you know what you are doing.''
 */
class Directory(jfile: JFile) extends Path(jfile) {
  override def toAbsolute: Directory = if (isAbsolute) this else super.toAbsolute.toDirectory
  override def toDirectory: Directory = this
  override def toFile: File = new File(jfile)
  override def normalize: Directory = super.normalize.toDirectory

  /** An iterator over the contents of this directory.
   */
  def list: Iterator[Path] =
    jfile.listFiles match {
      case null   => Iterator.empty
      case xs     => xs.iterator map Path.apply
    }

  def dirs: Iterator[Directory] = list collect { case x: Directory => x }
  def files: Iterator[File] = list collect { case x: File => x }

  override def walkFilter(cond: Path => Boolean): Iterator[Path] =
    list filter cond flatMap (_ walkFilter cond)

  def deepFiles: Iterator[File] = Path.onlyFiles(deepList())

  /** If optional depth argument is not given, will recurse
   *  until it runs out of contents.
   */
  def deepList(depth: Int = -1): Iterator[Path] =
    if (depth < 0) list ++ (dirs flatMap (_ deepList (depth)))
    else if (depth == 0) Iterator.empty
    else list ++ (dirs flatMap (_ deepList (depth - 1)))
}