Scala example source code file (VirtualFile.scala)

This example Scala source code file (VirtualFile.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

abstractfile, boolean, bytearrayinputstream, inputstream, iterator, jfile, noabstractfile, option, string, virtualfile

The VirtualFile.scala Scala example source code

/* NSC -- new Scala compiler
 * Copyright 2005-2013 LAMP/EPFL
 * @author  Martin Odersky
 */

package scala
package reflect
package io

import java.io.{ ByteArrayInputStream, ByteArrayOutputStream, InputStream, OutputStream, File => JFile }

/** This class implements an in-memory file.
 *
 *  @author  Philippe Altherr
 *  @version 1.0, 23/03/2004
 *
 *  ''Note:  This library is considered experimental and should not be used unless you know what you are doing.''
 */
class VirtualFile(val name: String, override val path: String) extends AbstractFile {
  /**
   * Initializes this instance with the specified name and an
   * identical path.
   *
   * @param name the name of the virtual file to be created
   * @return     the created virtual file
   */
  def this(name: String) = this(name, name)

  override def hashCode = path.hashCode
  override def equals(that: Any) = that match {
    case x: VirtualFile => x.path == path
    case _              => false
  }

  private var content = Array.emptyByteArray

  def absolute = this

  /** Returns null. */
  def file: JFile = null

  override def sizeOption: Option[Int] = Some(content.length)

  def input : InputStream = new ByteArrayInputStream(content)

  override def output: OutputStream = {
    new ByteArrayOutputStream() {
      override def close() {
        super.close()
        content = toByteArray()
      }
    }
  }

  def container: AbstractFile = NoAbstractFile

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

  /** @inheritdoc */
  override def isVirtual: Boolean = true

  // private var _lastModified: Long = 0
  // _lastModified

  /** Returns the time that this abstract file was last modified. */
  // !!! Except it doesn't - it's private and never set - so I replaced it
  // with constant 0 to save the field.
  def lastModified: Long = 0

  /** Returns all abstract subfiles of this abstract directory. */
  def iterator: Iterator[AbstractFile] = {
    assert(isDirectory, "not a directory '" + this + "'")
    Iterator.empty
  }

  /** Does this abstract file denote an existing file? */
  def create() { unsupported() }

  /** Delete the underlying file or directory (recursively). */
  def delete() { unsupported() }

  /**
   * 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.
   */
  def lookupName(name: String, directory: Boolean): AbstractFile = {
    assert(isDirectory, "not a directory '" + this + "'")
    null
  }

  /** Returns an abstract file with the given name. It does not
   *  check that it exists.
   */
  def lookupNameUnchecked(name: String, directory: Boolean) = unsupported()
}