two-phase deserialization of Map possible ?

[Martin Minka]

• my JSON string contains Map<String, Object>
• based on key I know class of value
• how to deserialize correctly such map ?
• my preferred way would be to first deserialize value as string (Map<String, String>) and then deserialize each value with known class information

thank you for any advice,
Martin

[Brandon Mintern]

The easiest way to get up and running is to parse it manually:

JsonParser jsonParser = new JsonParser();

Gson gson = new Gson();
// ...

JsonElement parsedJson = jsonParser.parse(jsonString);

JsonObject mapStringObj = parsedJson.getAsJsonObject(); // if the object is at the outer level

// Now iterate over the JsonObject

for (Entry<String, JsonElement> entry: mapStringObj.entrySet()) {

    String key = entry.getKey();
    // use your mapping from key to value class...

    Class valueClass = getClassFromKey(key);

    // Parse the JsonElement into an object of your desired class

    Object value = gson.fromJson(entry.getValue(), valueClass);

    // ... do stuffs with your key and value
}

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[Martin Minka]

Brandon,

thank you, this is exactly what I was looking for.

Martin

2013/4/11 Brandon Mintern <min...@easyesi.com>