Scala example source code file (Use.scala)

This example Scala source code file (Use.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, compilation, compilationfailure, file, globpatternmapper, mandatory, none, option, some, string

The Use.scala Scala example source code

/*                     __                                               *\
**     ________ ___   / /  ___     Scala Ant Tasks                      **
**    / __/ __// _ | / /  / _ |    (c) 2005-2013, LAMP/EPFL             **
**  __\ \/ /__/ __ |/ /__/ __ |    http://scala-lang.org/               **
** /____/\___/_/ |_/____/_/ | |                                         **
**                          |/                                          **
\*                                                                      */


package scala
package tools.ant
package sabbus

import java.io.File

import org.apache.tools.ant.types.{Path, Reference}
import org.apache.tools.ant.util.{GlobPatternMapper, SourceFileScanner}

class Use extends ScalaMatchingTask {

  def setId(input: String) {
    id = Some(input)
  }

  def setSrcdir(input: File) {
    sourceDir = Some(input)
  }

  def setDestdir(input: File) {
    destinationDir = Some(input)
  }

  def setFailOnError(input: Boolean) {
    failOnError = input
  }

  private var id: Option[String] = None
  private var sourceDir: Option[File] = None
  private var destinationDir: Option[File] = None
  private var failOnError: Boolean = true

  override def execute() {
    if (id.isEmpty) sys.error("Mandatory attribute 'id' is not set.")
    if (sourceDir.isEmpty) sys.error("Mandatory attribute 'srcdir' is not set.")
    val compiler = Compilers(id.get)
    if (!destinationDir.isEmpty) compiler.settings.d = destinationDir.get
    val mapper = new GlobPatternMapper()
    mapper.setTo("*.class")
    mapper.setFrom("*.scala")
    val includedFiles: Array[File] =
      new SourceFileScanner(this).restrict(
        getDirectoryScanner(sourceDir.get).getIncludedFiles,
        sourceDir.get,
        compiler.settings.d,
        mapper
      ) map (new File(sourceDir.get, _))
    if (includedFiles.length > 0)
      try {
        log("Compiling " + includedFiles.length + " file" + (if (includedFiles.length > 1) "s" else "") + " to " + compiler.settings.d.getAbsolutePath)
        val (errors, warnings) = compiler.compile(includedFiles)
        if (errors > 0)
          sys.error("Compilation failed with " + errors + " error" + (if (errors > 1) "s" else "") + ".")
        else if (warnings > 0)
          log("Compilation succeeded with " + warnings + " warning" + (if (warnings > 1) "s" else "") + ".")
      }
      catch {
        case CompilationFailure(msg, ex) =>
          ex.printStackTrace
          val errorMsg =
            "Compilation failed because of an internal compiler error (" + msg + "); see the error output for details."
          if (failOnError) sys.error(errorMsg) else log(errorMsg)
      }
  }

}