/* sbt -- Simple Build Tool
 * Copyright 2008 Mark Harrah
 */
package sbt

object ModuleUtilities
{
	/** Reflectively loads and returns the companion object for top-level class `className` from `loader`.
	* The class name should not include the `$` that scalac appends to the underlying jvm class for
	* a companion object. */
	def getObject(className: String, loader: ClassLoader): AnyRef =
	{
		val obj = Class.forName(className + "$", true, loader)
		val singletonField = obj.getField("MODULE$")
		singletonField.get(null)
	}

	def getCheckedObject[T](className: String, loader: ClassLoader)(implicit mf: reflect.ClassManifest[T]): T =
		mf.erasure.cast(getObject(className, loader)).asInstanceOf[T]

	def getCheckedObjects[T](classNames: Seq[String], loader: ClassLoader)(implicit mf: reflect.ClassManifest[T]): Seq[(String,T)] =
		classNames.map(name => (name, getCheckedObject(name, loader)))
}