Allowing subtyping

Author: kohsuke

README.md

@@ -1,9 +1,21 @@
 # On-the-fly LESS compiler
 
 This library defines an object you can bound in the URL space (via Stapler) to compile LESS files
-from classpath and serve them as CSS files.
+from classpath and serve them as CSS files. This enables modular web applications to compose
+their LESS files at runtime to enable late binding.
+
+To use it, expose `LessServer` from your URL space (for example by binding it to a field of your "App" class.)
+
+```
+class App {
+    public final LessServer less_css = new LessServer();
+}
+```
+
+Then request to `/less_css/foo/bar/zot.less.css` would compile and render `foo/bar/zot.less` in your classpath.
+To prevent leaking the class files and other potentially sensitive information inside the program, `LessServer`
+only serves `*.less` files.
 
-In this way, modular web applications can compose their LESS files at runtime to enable late binding.
 
 This library relies on [lesscss-java](https://github.com/marceloverdijk/lesscss-java), which in turn uses
 Rhino to run the original version of the less compiler. lesscss-java is in many ways poorly implemented,

src/main/java/org/kohsuke/stapler/less/LessServer.java

@@ -19,12 +19,12 @@
  * @author Kohsuke Kawaguchi
  */
 public class LessServer {
-    private final ClassLoader cl;
+    protected final ClassLoader cl;
 
     /**
      * Directory to store the generated CSS as cache.
      */
-    private final File cache;
+    protected final File cache;
 
     /**
      * Cache file we generate should have this timestamp, or else we need to regenerate the file.