Scala example source code file (PlainFile.scala)

This example Scala source code file (PlainFile.scala) is included in the DevDaily.com "Java Source Code Warehouse" project. The intent of this project is to help you "Learn Java by Example" ^TM.

Java - Scala tags/keywords

abstractfile, abstractfile, boolean, boolean, int, io, iterator, path, plaindirectory, plainfile, plainfile, some, string, unit, unit

The Scala PlainFile.scala source code

/* NSC -- new Scala compiler
 * Copyright 2005-2011 LAMP/EPFL
 * @author  Martin Odersky
 */


package scala.tools.nsc
package io

import java.io.{ FileInputStream, FileOutputStream, IOException }
import PartialFunction._

object PlainFile {
  /**
   * If the specified File exists, returns an abstract file backed
   * by it. Otherwise, returns null.
   */
  def fromPath(file: Path): PlainFile =
    if (file.isDirectory) new PlainDirectory(file.toDirectory)
    else if (file.isFile) new PlainFile(file)
    else null
}

class PlainDirectory(givenPath: Directory) extends PlainFile(givenPath) {
  override def isDirectory = true
  override def iterator = givenPath.list filter (_.exists) map (x => new PlainFile(x))
  override def delete(): Unit = givenPath.deleteRecursively()
}

/** This class implements an abstract file backed by a File. 
 */
class PlainFile(val givenPath: Path) extends AbstractFile {
  assert(path ne null)

  val file = givenPath.jfile
  override def underlyingSource = Some(this)
  
  private val fpath = givenPath.toAbsolute

  /** Returns the name of this abstract file. */
  def name = givenPath.name

  /** Returns the path of this abstract file. */
  def path = givenPath.path

  /** The absolute file. */
  def absolute = new PlainFile(givenPath.toAbsolute)
    
  override def container: AbstractFile = new PlainFile(givenPath.parent)
  override def input = givenPath.toFile.inputStream()
  override def output = givenPath.toFile.outputStream()
  override def sizeOption = Some(givenPath.length.toInt)
  
  override def hashCode(): Int = fpath.hashCode
  override def equals(that: Any): Boolean = that match {
    case x: PlainFile => fpath == x.fpath
    case _            => false
  }

  /** Is this abstract file a directory? */
  def isDirectory: Boolean = givenPath.isDirectory

  /** Returns the time that this abstract file was last modified. */
  def lastModified: Long = givenPath.lastModified

  /** Returns all abstract subfiles of this abstract directory. */
  def iterator: Iterator[AbstractFile] = {
    if (!isDirectory) Iterator.empty
    else givenPath.toDirectory.list filter (_.exists) map (new PlainFile(_))
  }

  /**
   * Returns the abstract file in this abstract directory with the
   * specified name. If there is no such file, returns null. The
   * argument "directory" tells whether to look for a directory or
   * or a regular file.
   *
   * @param name      ...
   * @param directory ...
   * @return          ...
   */
  def lookupName(name: String, directory: Boolean): AbstractFile = {
    val child = givenPath / name
    if ((child.isDirectory && directory) || (child.isFile && !directory)) new PlainFile(child)
    else null
  }

  /** Does this abstract file denote an existing file? */
  def create(): Unit = if (!exists) givenPath.createFile()

  /** Delete the underlying file or directory (recursively). */
  def delete(): Unit =
    if (givenPath.isFile) givenPath.delete()
    else if (givenPath.isDirectory) givenPath.toDirectory.deleteRecursively()

  /** Returns a plain file with the given name. It does not
   *  check that it exists.
   */
  def lookupNameUnchecked(name: String, directory: Boolean): AbstractFile =
    new PlainFile(givenPath / name)
}