/**
     * Returns true if f1 supersedes f2
     */
    private static boolean supersedes(Fmri f1, Fmri f2, String pAuth) {
        boolean f1Preferred = f1.getAuthority().equals(pAuth);
        boolean f2Preferred = f2.getAuthority().equals(pAuth);

        // If f1 is from the preferred authority and f2 is not, then
        // f1 supersedes.
        if (f1Preferred && ! f2Preferred) {
            return true;
        }

        // If f2 is from the preferred authority and f1 is not, then
        // f1 does not supersede
        if (f2Preferred && ! f1Preferred) {
            return false;
        }

        // Otherwise compare versions. f1 supersedes if it is a successor
        return f1.isSuccessor(f2);
    }

    public static void doGlassFishList(File cwd) throws java.lang.Exception {
            Image image = new Image(cwd);
            List<String> installed = new ArrayList<String>();
            for (Image.FmriState each : image.getInventory(null, false)) {
                installed.add(each.fmri.getName());
            }
            String pAuth = image.getPreferredAuthorityName();
            SortedMap<String, Fmri> addOnMap = new TreeMap();
            for (Image.FmriState each : image.getInventory(null, true)) {
                Fmri fmri = each.fmri;
                // If this exact package is installed, or another version
                // of this package is installed, then skip it.
                if (each.installed || installed.contains(fmri.getName())) {
                    continue;
                }

                if (addOnMap.containsKey(fmri.getName())) {
                   // We have seen this package name already. See if this
                   // version should replace the saved version.
                   Fmri saved = addOnMap.get(fmri.getName());
                   if (supersedes(fmri, saved, pAuth)) {
                       addOnMap.put(fmri.getName(), fmri);
                   }
                } else {
                   // We haven't seen this package name yet. Save fmri
                   addOnMap.put(fmri.getName(), fmri);
                }

            }
    
            for (Fmri f : addOnMap.values()) {
                System.out.println(f.toString() + ":" + f.getAuthority());
            }
    }