GWT HashMap to/from JSON

Question

I might be getting a bit tired tonight but here it goes:

I'd like to have GWT HashMap to/from JSON. How would I achieve this?

In other words, I'd like to take an HashMap, take its JSON representation, store it somewhere and get it back to its native Java representation.

Answer 1

Here is my quick solution:

public static String toJson(Map<String, String> map) {
    String json = "";
    if (map != null && !map.isEmpty()) {
        JSONObject jsonObj = new JSONObject();
        for (Map.Entry<String, String> entry: map.entrySet()) {
            jsonObj.put(entry.getKey(), new JSONString(entry.getValue()));
        }
        json = jsonObj.toString();
    }
    return json;
}

public static Map<String, String> toMap(String jsonStr) {
    Map<String, String> map = new HashMap<String, String>();

    JSONValue parsed = JSONParser.parseStrict(jsonStr);
    JSONObject jsonObj = parsed.isObject();
    if (jsonObj != null) {
        for (String key : jsonObj.keySet()) {
            map.put(key, jsonObj.get(key).isString().stringValue());
        }
    }

    return map;
}