JarFileResource.getFile() now returns the Jar's java.io.File object

Signed-off-by: Joakim Erdfelt <joakim.erdfelt@gmail.com>

jetty-util/src/main/java/org/eclipse/jetty/util/resource/JarFileResource.java

@@ -404,4 +404,12 @@ public class JarFileResource extends JarResource
         URL url = new URL(string);
         return url.sameFile(resource.getURI().toURL());
     }
+
+    @Override
+    public File getFile()
+    {
+        if (_file != null)
+            return _file;
+        return null;
+    }
 }