Scala example source code file (ObjectRunner.scala)

This example Scala source code file (ObjectRunner.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

boolean, boolean, either, left, list, list, net, network, objectrunner, reflection, right, scalaclassloader, seq, seq, string, string

The Scala ObjectRunner.scala source code

/* NSC -- new Scala compiler
 * Copyright 2005-2011 LAMP/EPFL
 * @author  Lex Spoon
 */


package scala.tools.nsc

import java.net.URL
import util.ScalaClassLoader
import java.lang.reflect.InvocationTargetException
import util.Exceptional.unwrap

/** An object that runs another object specified by name.
 *
 *  @author  Lex Spoon
 *  @version 1.1, 2007/7/13
 */
object ObjectRunner {
  /** Check whether a class with the specified name
   *  exists on the specified class path. */
  def classExists(urls: List[URL], objectName: String): Boolean =
    ScalaClassLoader.classExists(urls, objectName)
  
  /** Run a given object, specified by name, using a
   *  specified classpath and argument list.
   *
   *  @throws ClassNotFoundException   
   *  @throws NoSuchMethodException
   *  @throws InvocationTargetException 
   */  
  def run(urls: List[URL], objectName: String, arguments: Seq[String]) {
    (ScalaClassLoader fromURLs urls).run(objectName, arguments)    
  }
  
  /** Catches exceptions enumerated by run (in the case of InvocationTargetException,
   *  unwrapping it) and returns it any thrown in Left(x).
   */
  def runAndCatch(urls: List[URL], objectName: String, arguments: Seq[String]): Either[Throwable, Boolean] = {
    try   { run(urls, objectName, arguments) ; Right(true) }
    catch { case e => Left(unwrap(e)) }
  }
}