GSON JSON writer streaming

gson_streaming.java

Object result = getResult();
if (result instanceof List) {
  StringWriter output = new StringWriter();
  JsonWriter jsonWriter = new JsonWriter(output);
  List list = (List) result;
  jsonWriter.beginArray();
  for (int i = 0, n = list.size(); i < n; i++) {
    Object obj = list.get(i);
    GSON.toJson(obj, obj.getClass(), jsonWriter);
  }
  jsonWriter.endArray();
  jsonWriter.close();
  useJson(output.toString());
}
else {
  useJson(GSON.toJson(result));
}