code: private static String handleFileField(String property, CtClass clazz) throws NotFoundException,
          CannotCompileException {
          String wrapperName = property + "wrapper";
          StringBuilder builder = new StringBuilder();
          builder.append(createTrace(String.format("Handle File type property '%s'", property)))
              .append(String.format("if(%s == null) {", property))
              .append(String.format("elements.add(new OpenEngSBModelEntry(\"%s\"", wrapperName))
              .append(", null, FileWrapper.class));}\n else {")
              .append(String.format("FileWrapper %s = new FileWrapper(%s);\n", wrapperName, property))
              .append(String.format("%s.serialize();\n", wrapperName))
              .append(String.format("elements.add(new OpenEngSBModelEntry(\"%s\",%s,%s.getClass()));}\n",
                  wrapperName, wrapperName, wrapperName));
          addFileFunction(clazz, property);
          return builder.toString();
      }
docs: Creates the logic which is needed to handle fields which are File types, since they need special treatment.