/** Global bindings associated with script engines created by this manager. */
    private Bindings globalScope;
    
    private boolean canCallerAccessLoader(ClassLoader loader) {
        SecurityManager sm = System.getSecurityManager();
        if (sm != null) {
            ClassLoader callerLoader = getCallerClassLoader();
            if (callerLoader != null) {
                if (loader != callerLoader || !isAncestor(loader, callerLoader)) {
                    try {
                        sm.checkPermission(SecurityConstants.GET_CLASSLOADER_PERMISSION);
                    } catch (SecurityException exp) {
                        if (DEBUG) exp.printStackTrace();
                        return false;
                    }
                } // else fallthru..
            } // else fallthru..
        } // else fallthru..
        
        return true;
    }
    
    // Note that this code is same as ClassLoader.getCallerClassLoader().
    // But, that method is package private and hence we can't call here.
    private ClassLoader getCallerClassLoader() {
        Class caller = Reflection.getCallerClass(3);
        if (caller == null) {
            return null;
        }
        return caller.getClassLoader();
    }
    
    // is cl1 ancestor of cl2?
    private boolean isAncestor(ClassLoader cl1, ClassLoader cl2) {
        do {
            cl2 = cl2.getParent();
            if (cl1 == cl2) return true;
        } while (cl2 != null);
        return false;
    }
}