iTextSharp.text.pdf.PdfCopyFieldsImp.MergeField C# (CSharp) Метод

        internal void MergeField(String name, AcroFields.Item item)
        {
            Dictionary<string,object> map = fieldTree;
            StringTokenizer tk = new StringTokenizer(name, ".");
            if (!tk.HasMoreTokens())
                return;
            while (true) {
                String s = tk.NextToken();
                Object obj;
                map.TryGetValue(s, out obj);
                if (tk.HasMoreTokens()) {
                    if (obj == null) {
                        obj = new Dictionary<string,object>();
                        map[s] = obj;
                        map = (Dictionary<string,object>)obj;
                        continue;
                    }
                    else if (obj is Dictionary<string,object>)
                        map = (Dictionary<string,object>)obj;
                    else
                        return;
                }
                else {
                    if (obj is Dictionary<string,object>)
                        return;
                    PdfDictionary merged = item.GetMerged(0);
                    if (obj == null) {
                        PdfDictionary field = new PdfDictionary();
                        if (PdfName.SIG.Equals(merged.Get(PdfName.FT)))
                            hasSignature = true;
                        foreach (PdfName key in merged.Keys) {
                            if (fieldKeys.ContainsKey(key))
                                field.Put(key, merged.Get(key));
                        }
                        List<object> list = new List<object>();
                        list.Add(field);
                        CreateWidgets(list, item);
                        map[s] =  list;
                    }
                    else {
                        List<object> list = (List<object>)obj;
                        PdfDictionary field = (PdfDictionary)list[0];
                        PdfName type1 = (PdfName)field.Get(PdfName.FT);
                        PdfName type2 = (PdfName)merged.Get(PdfName.FT);
                        if (type1 == null || !type1.Equals(type2))
                            return;
                        int flag1 = 0;
                        PdfObject f1 = field.Get(PdfName.FF);
                        if (f1 != null && f1.IsNumber())
                            flag1 = ((PdfNumber)f1).IntValue;
                        int flag2 = 0;
                        PdfObject f2 = merged.Get(PdfName.FF);
                        if (f2 != null && f2.IsNumber())
                            flag2 = ((PdfNumber)f2).IntValue;
                        if (type1.Equals(PdfName.BTN)) {
                            if (((flag1 ^ flag2) & PdfFormField.FF_PUSHBUTTON) != 0)
                                return;
                            if ((flag1 & PdfFormField.FF_PUSHBUTTON) == 0 && ((flag1 ^ flag2) & PdfFormField.FF_RADIO) != 0)
                                return;
                        }
                        else if (type1.Equals(PdfName.CH)) {
                            if (((flag1 ^ flag2) & PdfFormField.FF_COMBO) != 0)
                                return;
                        }
                        CreateWidgets(list, item);
                    }
                    return;
                }
            }
        }