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/* NSC -- new Scala compiler
* Copyright 2005-2006 LAMP/EPFL
* @author Lex Spoon
*/
// $Id$
package scala.tools.nsc
import java.lang.Class
import java.lang.{ClassNotFoundException, NoSuchMethodException}
import java.io.File
import java.lang.reflect.{Method,Modifier}
import java.net.URLClassLoader
/** An object that runs another object specified by name.
*
* @author Lex Spoon
* @version 1.0, 15/06/2006
*/
object ObjectRunner {
/** Look up a class with a given class path.
*
* @param classpath ...
* @param objectName ...
* @return ...
*/
def findClass(classpath: List[String], objectName: String)
: Option[Class] =
{
val classpathURLs = classpath.map(s => new File(s).toURL).toArray
val mainLoader = new URLClassLoader(classpathURLs, null)
try {
Some(Class.forName(objectName, true, mainLoader))
} catch {
case _:ClassNotFoundException => None
}
}
/** Check whether a class with the specified name
* exists on the specified class path.
*
* @param classpath ...
* @param objectName ...
* @return ...
*/
def classExists(classpath: List[String], objectName: String) =
!(findClass(classpath, objectName).isEmpty)
/** Run a given object, specified by name, using a
* specified classpath and argument list.
*
* @param classpath ...
* @param objectName ...
* @param arguments ...
*
* @throws ClassNotFoundException ...
* @throws NoSuchMethodError ...
* @throws InvocationTargetException ...
*/
def run(
classpath: List[String],
objectName: String,
arguments: Seq[String]): Unit =
{
val clsToRun = findClass(classpath, objectName) match {
case Some(cls) => cls
case None => throw new ClassNotFoundException(objectName)
}
val method = clsToRun.getMethod("main", List(classOf[Array[String]]).toArray)
if ((method.getModifiers & Modifier.STATIC) == 0)
throw new NoSuchMethodException(objectName + ".main is not static")
method.invoke(null, List(arguments.toArray).toArray)
}
}
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