scoverage#171 Migrate ScoverageRunner from Groovy to Kotlin

Author: eyalroth

src/main/groovy/org/scoverage/ScoverageRunner.groovy

@@ -0,0 +1,27 @@
+package org.scoverage
+
+import groovy.lang.Closure
+import org.gradle.api.file.FileCollection
+import org.gradle.api.tasks.Classpath
+import java.net.URL
+import java.net.URLClassLoader
+
+class ScoverageRunner(@Classpath val runtimeClasspath: FileCollection) {
+
+    fun run(action: Closure<*>) {
+
+        val cloader = Thread.currentThread().getContextClassLoader() as URLClassLoader
+
+        val method = URLClassLoader::class.java.getDeclaredMethod("addURL", URL::class.java)
+        method.isAccessible = true
+
+        runtimeClasspath.files.forEach { f ->
+            val url = f.toURI().toURL()
+            if (!cloader.urLs.contains(url)) {
+                method.invoke(cloader, url)
+            }
+        }
+
+        action.call()
+    }
+}