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+/* __ *\
+** ________ ___ / / ___ Scala API **
+** / __/ __// _ | / / / _ | (c) 2002-2007, LAMP/EPFL **
+** __\ \/ /__/ __ |/ /__/ __ | **
+** /____/\___/_/ |_/____/_/ | | **
+** |/ **
+\* */
+
+// $Id$
+
+
+package scala.mobile
+
+
+import java.lang.ClassLoader
+import java.net._
+
+import scala.collection.mutable._
+
+/** The class <code>Location</code> provides a <code>create</code>
+ * method to instantiate objects from a network location by
+ * specifying the URL address of the jar/class file.<p/>
+ *
+ * An update of the jar/class file should not break your code as far
+ * as the used class names and method signatures are the same.<p/>
+ *
+ * Example:<pre>
+ * <b>val</b> url = <b>new</b> URL("http://scala-lang.org/classes/examples.jar");
+ * <b>val</b> obj = <b>new</b> Location(url) create "examples.sort";</pre>
+ *
+ * @see <a href="Code.html">Code</a>
+ *
+ * @author Stephane Micheloud
+ * @version 1.0, 04/05/2004
+ */
+class Location(url: URL) {
+
+ /** A cache containing all class loaders of this location.
+ */
+ private var lcache: Map[URL, ClassLoader] = new HashMap
+
+ /** The class loader associated with this location.
+ */
+ private val loader = if (url eq null)
+ ClassLoader.getSystemClassLoader()
+ else
+ lcache.get(url) match {
+ case Some(cl) =>
+ cl
+ case _ =>
+ val cl = new URLClassLoader(Array(url))
+ lcache(url) = cl
+ cl
+ }
+
+ /** A cache containing all classes of this location.
+ */
+ private var ccache: Map[String, java.lang.Class] = new HashMap
+
+ /** Return the code description for the string <code>className</code>
+ * at this location.
+ *
+ * @param classname the name of the class
+ * @return the code description corresponding to
+ * <code>className</code>.
+ */
+ def create(className: String) = new Code(
+ ccache.get(className) match {
+ case Some(clazz) =>
+ clazz
+ case _ =>
+ val clazz = if (loader.loadClass(className).isInterface()) {
+ // Scala source: class A { ... };
+ // Java bytecode: interface A.class + class A$class.class
+ loader.loadClass(className + "$class")
+ }
+ else {
+ // Scala source: object A { ... };
+ // Java bytecode: interface A.class + class A$.class
+ loader.loadClass(className + "$")
+ }
+ ccache(className) = clazz
+ clazz
+ }
+ )
+
+}
+
+/** The object <code>Location</code> can be used to instantiate
+ * objects on the same Java VM. It is just provided to illustrate
+ * the special case where resources are available locally.<p/>
+ *
+ * Example:<pre>
+ * <b>val</b> obj = Location.create("xcode.Math");
+ * <b>val</b> x = obj[Int, Int]("square")(5);</pre>
+ *
+ * @author Stephane Micheloud
+ * @version 1.0, 04/05/2004
+ */
+object Location extends Location(null)