Using preExec-script to provide __dirname in Rhino's CommonJS implementation

app.js

// print __dirname to System.out
console.log("app.js (__dirname): " + __dirname);

TestPreExec.java

public class TestPreExec {
    @Test
    public void testPre() {
        Context context = Context.enter();
        try {
            ScriptableObject scope = context.initStandardObjects();

            URI uri = URI.create(TestPreExec.class.getResource(".")
                    .toExternalForm());
            Iterable<URI> privilegedUris = singletonList(uri);
            Iterable<URI> fallbackUris = null;
            ModuleScriptProvider provider = new StrongCachingModuleScriptProvider(
                    new UrlModuleSourceProvider(privilegedUris, fallbackUris));

            String source = "";
            source += "console = {log: function(s) { java.lang.System.out.println(s + '') }};\n";
            source += "__dirname = new java.io.File(java.net.URI.create(module.uri)).getParent();\n";
            Script preExec = context.compileString(source, "pre-exec", 1, null);
            Script postExec = null;
            boolean sandboxed = false;

            Require require = new Require(context, scope, provider, preExec,
                    postExec, sandboxed);
            require.requireMain(context, "app");
        } finally {
            Context.exit();
        }
    }
}