CODEWITHSUNDEEP
java-8gson
Shabar
Shabar

Reputation: 2823

Update inner object element in Json using Gson

I have below json and need to update elements, below code works for elements in top level, How can I extend this to work it inside another inner level (object).

Json:

{
  "name": George,
  "version": "2.0",
  "reqParams": {
    "headerId": "this needs to be updated",
    "queue": "draft",
  }
}

In below code I am passing below

eg. keyPath = "headerId" updateText = "123456" jsonText = above json

Code : 

public String updateValue(String keyPath, String updateText, String jsonText) {
    String[] keys = keyPath.split("/");
    JsonParser jsonParser = new JsonParser();
    JsonObject jsonObject = (JsonObject) jsonParser.parse(jsonText);
    JsonObject returnVal = jsonObject; // This holds the ref to target json object
    JsonPrimitive jp = new JsonPrimitive(updateText);
    String finalKey = keys[keys.length - 1];
    for(String key : keys)
    {
        if (jsonObject.get(key) != null && jsonObject.get(key).isJsonObject())
        {
            jsonObject = (JsonObject)jsonObject.get(key);
        }
    }
    jsonObject.remove(finalKey);
    jsonObject.add(finalKey, jp);
    return returnVal.toString();
}

Code

Expected out put json:

{
  "name": George,
  "version": "2.0",
  "reqParams": {
    "headerId": "123456",
    "queue": "draft",
  }
}

Actual reult:

{
  "name": George,
  "version": "2.0",
  "reqParams": {
    "headerId": "this needs to be updated",
    "queue": "draft",
  },
  "headerId": "123456",
}

Upvotes: 1

Views: 653

Answers (2)

Shabar
Shabar

Reputation: 2823

Updated code slightly and pass parameters as suggested by @Smile answer

keyPath : reqParams/headerId
          someId (if exist in root level)

Code :

public String updateValue(String keyPath, String updateText, String jsonText) {
    String[] keys = keyPath.split("/");
    JsonParser jsonParser = new JsonParser();
    JsonObject jsonObject = (JsonObject) jsonParser.parse(jsonText);
    JsonObject returnVal = jsonObject; // This holds the ref to target json object
    JsonPrimitive jp = new JsonPrimitive(updateText);
    String finalKey = keys[keys.length - 1];
    for (String key : keys) {

    if (jsonObject.get(key) != null && jsonObject.get(key).isJsonObject()) {
        jsonObject = (JsonObject) jsonObject.get(key);
        jsonObject.remove(finalKey);
        jsonObject.add(finalKey, jp);
        return returnVal.toString();
    } else if (jsonObject.get(finalKey) == null) {
        return returnVal.toString();
    }
}

jsonObject.remove(finalKey);
jsonObject.add(finalKey, jp);
return returnVal.toString();

}

Upvotes: 0

Smile
Smile

Reputation: 4088

Pass keyPath as "reqParams/headerId" because headerId is inside reqParams and not at root level of JSON.

Upvotes: 1

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