1 files changed, 36 insertions, 0 deletions

diff --git a/src/compiler/scala/tools/nsc/ObjectRunner.scala b/src/compiler/scala/tools/nsc/ObjectRunner.scala
new file mode 100644
index 0000000000..5649fcbc05
--- /dev/null
+++ b/src/compiler/scala/tools/nsc/ObjectRunner.scala
@@ -0,0 +1,36 @@
+package scala.tools.nsc
+import java.net.URLClassLoader
+import java.io.File
+import java.lang.reflect.{Method,Modifier}
+
+/** An object that runs another object specified by name. */
+object ObjectRunner {
+  def isMainMethod(meth: Method): Boolean = {
+    def paramsOK(params: Array[Class]): Boolean = {
+      (params.length == 1) &&
+      (params(0) == classOf[Array[String]])
+    }
+    meth.getName == "main" &&
+    Modifier.isStatic(meth.getModifiers) &&
+    paramsOK(meth.getParameterTypes)
+  }
+
+  def run(
+      classpath: List[String],
+      objectName: String,
+      arguments: Seq[String]): Unit =
+  {
+    val classpathURLs = classpath.map(s => new File(s).toURL).toArray
+    val mainLoader  = new URLClassLoader(classpathURLs, null)
+    val clsToRun = Class.forName(objectName, true, mainLoader)
+
+    val method = clsToRun.getMethods.find(isMainMethod) match {
+      case Some(meth) => meth
+      case None => {
+        throw new Error("no main method in object " + objectName)
+      }
+    }
+    val res = method.invoke(null, List(arguments.toArray).toArray)
+    ()
+  }
+}