Scala example source code file (FileManager.scala)

This example Scala source code file (FileManager.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

bufferedreader, file, file, fileinputstream, hashmap, io, java_opts, javac_cmd, long, long, net, network, scalac_opts, sfile, sfile, string, string

The Scala FileManager.scala source code

/* NEST (New Scala Test)
 * Copyright 2007-2011 LAMP/EPFL
 * @author Philipp Haller
 */

// $Id$

package scala.tools.partest
package nest

import java.io.{File, FilenameFilter, IOException, StringWriter,
                FileInputStream, FileOutputStream, BufferedReader,
                FileReader, PrintWriter, FileWriter}
import java.net.URI
import scala.tools.nsc.io.{ Path, Directory, File => SFile }
import scala.collection.mutable.HashMap
import sys.process._

trait FileManager {  
  /**
   * Compares two files using a Java implementation of the GNU diff
   * available at http://www.bmsi.com/java/#diff.
   *
   * @param  f1  the first file to be compared
   * @param  f2  the second file to be compared
   * @return the text difference between the compared files
   */
  def compareFiles(f1: File, f2: File): String = {
    val diffWriter = new StringWriter
    val args = Array(f1.getAbsolutePath(), f2.getAbsolutePath())
    
    DiffPrint.doDiff(args, diffWriter)
    val res = diffWriter.toString
    if (res startsWith "No") "" else res
  }
  
  def testRootDir: Directory
  def testRootPath: String

  var JAVACMD: String
  var JAVAC_CMD: String

  var CLASSPATH: String
  var LATEST_LIB: String

  var showDiff = false
  var updateCheck = false
  var showLog = false
  var failed = false

  var SCALAC_OPTS = PartestDefaults.scalacOpts
  var JAVA_OPTS   = PartestDefaults.javaOpts
  var timeout     = PartestDefaults.timeout
  // how can 15 minutes not be enough? What are you doing, run/lisp.scala?
  // You complete in 11 seconds on my machine.
  var oneTestTimeout = 60 * 60 * 1000
  
  /** Only when --debug is given. */
  lazy val testTimings = new HashMap[String, Long]
  def recordTestTiming(name: String, milliseconds: Long) =
    synchronized { testTimings(name) = milliseconds }
  def showTestTimings() {
    testTimings.toList sortBy (-_._2) foreach { case (k, v) => println("%s: %s".format(k, v)) }
  }

  def getLogFile(dir: File, fileBase: String, kind: String): File =
    new File(dir, fileBase + "-" + kind + ".log")

  def getLogFile(file: File, kind: String): File = {
    val dir      = file.getParentFile
    val fileBase = basename(file.getName)

    getLogFile(dir, fileBase, kind)
  }

  def logFileExists(file: File, kind: String) =
    getLogFile(file, kind).canRead
  
  def overwriteFileWith(dest: File, file: File) =
    dest.isFile && copyFile(file, dest)
  
  def copyFile(from: File, dest: File): Boolean = {    
    if (from.isDirectory) {
      assert(dest.isDirectory, "cannot copy directory to file")
      val subDir:Directory = Path(dest) / Directory(from.getName)
      subDir.createDirectory()
      from.listFiles.toList forall (copyFile(_, subDir))
    }
    else {
      val to = if (dest.isDirectory) new File(dest, from.getName) else dest
      
      try {
        SFile(to) writeAll SFile(from).slurp()
        true
      }
      catch { case _: IOException => false }
    }
  }

  def mapFile(file: File, replace: String => String) {
    val f = SFile(file)
    
    f.printlnAll(f.lines.toList map replace: _*)
  }
}