Review

class PdfNumberTree {
    private static void iterateItems(PdfDictionary dic, HashMap<Integer, PdfObject> items) {
        PdfArray nn = (PdfArray)PdfReader.getPdfObjectRelease(dic.get(PdfName.NUMS));
        if (nn != null) {
            for (int k = 0; k < nn.size(); ++k) {
                PdfNumber s = (PdfNumber)PdfReader.getPdfObjectRelease(nn.getPdfObject(k++));
                items.put(Integer.valueOf(s.intValue()), nn.getPdfObject(k));
            }
        }
        else if ((nn = (PdfArray)PdfReader.getPdfObjectRelease(dic.get(PdfName.KIDS))) != null) {
            for (int k = 0; k < nn.size(); ++k) {
                PdfDictionary kid = (PdfDictionary)PdfReader.getPdfObjectRelease(nn.getPdfObject(k));
                iterateItems(kid, items);
            }
        }
    }

}